Acrivos, Juana Vivó

Code, J.

Geballe, T. H

Yamaya, K.

English

San Jose State University

San Jose State University
SJSU ScholarWorks
Faculty Publications, Chemistry Chemistry
1-1-1981
Effects of N2H4 on the Transition Temperature in
the Anisotropic Superconductor TaSe3
K. Yamaya
Hokkaido University
T. H. Geballe
Stanford University
Juana Vivó Acrivos
San Jose State University, juana.acrivos@sjsu.edu
J. Code
San Jose State University
Follow this and additional works at: https://scholarworks.sjsu.edu/chem_pub
Part of the Physical Chemistry Commons
This Article is brought to you for free and open access by the Chemistry at SJSU ScholarWorks. It has been accepted for inclusion in Faculty
Publications, Chemistry by an authorized administrator of SJSU ScholarWorks. For more information, please contact scholarworks@sjsu.edu.
Recommended Citation
K. Yamaya, T. H. Geballe, Juana Vivó Acrivos, and J. Code. "Effects of N2H4 on the Transition Temperature in the Anisotropic
Superconductor TaSe3" Physica (1981): 444-447. doi:10.1016/0378-4363(81)90292-8
Physica 105B (1981) 444-447 
North-Holland Publishing Company 
EFFECT OF N2H., INTERCALATION ON THE TRANSITION TEMPERATURE 

AND ELECTRON TRANSPORT IN ANISOTROPIC 

SUPERCONDUCTOR: TaSe3 

K. YAMAYA, T.H. GEBALLE*, J.V. ACRIVOSt and J. CODEt 
Dtpartmmt of Nuclear Engineering, Hokkaido University, Sapporo, Japan 
•Department of Applied Physics, Stanford University, Stanford, California 94305, USA 

t Department of Chemistry, San Jose State University, San Jose, California 95192, USA 

We have intercalated TaSe3 with N2~. The room temperature resistance Rb(RT) along the b-aJds decreases b! J;~ 
during the reaction. The ratio of Rb(RT)!Rb(4.2 K) varies from 60 in TaSe3 to 5 in the intercalated samples. An anom~o • 
Rb is observed near 100 K. It is suggested that this anomaly is due to the formation of charge-density-wave (CDW). ~ 
superconduct~n.g transition temperature, Tc. is suppressed from 2.2 to 1.5 K. The correlation betwe~n the_suppr~~ 
superconducttVIty and the formation of CDW is discussed as compared with the result obtamed m the · 
dichalcogenides. 
I. Introduction large anisotropy rather than a one-dimensior.i 
system. a! ed IIi'' 
MX2 
 is well known to be interc at Th:6
organic molecules and hydrogen 15: 1· f ~: 

enhancement of Tc and the suppression °- ,;. 
· anv tn•"d 1CDW formations were observe n m ~ ..,
[5 6) Jt 1 "~ calated compounds of MXz ' · . IS eff~; 
. . . . t the intercalatiOn
niterestmg to mveshga e . TaSeJ and" 

on Tc and the electron transport I~ MX,. n: 

compare them with the e1Ie~t 10 we; e!t;· 

measurements of X-ray reflectmg po · 

0 ..,_ 
t
0 .:... 
cA 
T Se The slllan
Structure of a ;.Fi
•g. 1. The crystal 
circles identify Ta (Se) atoms. 
The trichalcogenides of niobium and tantalum 
MXJ, have been investigated extensively becaus~ 
Of _their low-dimensional characters. Although 
thetr crystal structures are similar, their electron 
transport properties show significant differences 
[1). NbSe3 shows two charge-density-wave 
(CDW) tr~nsitions at 142 and 85 K [2] and TaS3 
shows .Pe1erls . transition at 220 K [3]. No 
anomahes assoCiated with low-dimensional phase 
transition have been observed in Tase [l]. In 3 
fact, TaSeJ is a superconductor with a T. of 

2( :t0.5)K [1, 4]. The reasonable interpreta~ion 

for the absence of the structural phase t 't'
i T S · rans1 ton 
n a e3 IS that the interchain overlap of electron 
Wave functions is larger than that of other MX 
Compounds. 3 
u As s~ow~ in fig._l, TaSe3 has a structure made 
p of ~nfimte chams of trigonal prisms, TaSe6, 
extendmg paraii~I to the b-axis. Ta in TaSe3 is 
surrou?ded by ~lght Se atoms forming a bicap­
~d tngonal pnsm. According to this point of 
VIew we have to co ·dT nsi er 1ayers made of coupled :seJ_fibe~. Between them lies a Van der Waals 
g p With dimensions close to th f hdichal . ose o t e layered 
'dcogedmdes, MXz. TaSeJ, therefore, can be COn Sl ere as a two-dimensional . . 
system wtth a 
' 
0378-4363/81/0000-(){)()()j$? 50 
-· ©North-Holland Publishing Company 
and Yamada Science Foundation 
445 K. Yamaya et al./N2H4 intercalation on TaSe3 
:i:al resistivity, and Tc in TaSe3, when this is 
~d to N2~, are reported in this paper. Tc is 
~d to be suppressed on intercalation of NzfL 
~Jan anomaly in the resistivity is observed near 
R The correlation between the suppression 
1T, and an anomaly in resistivity is compared 
r1l that of intercalation on MX2 and discussed. 
! Experiments 
TaSeJwere grown by the transport method, as 
:![llrted in (4]. The resistance ratios, RRR, 
Riroom temperature)/R(4.2 K), and Tc of the 
;:\i!als were confirmed to be the same values as 
:C!erved in previous works [1, 4]. The resistivity 
:t samples was measured by a four-probe 
::ethod along the b-axis with a de current. 
~~conductivity was detected by the resistivity 
:tasurements. The X-ray diffraction and trans­
; ~easurements of TaSe3 exposed to N 2fL 
l;IJr m the absence of air were carried out 
;ng the method already developed for TaS [7].21 
le measurements of the temperature depen­
hce of the 	 · · · · reststlVlty and T. m the samples
ttre carried 	 t d c 
, . ou un er He gas atmosphere to 
•·ctd the reaction with air. 
1Result and discussion 
X-ray diff . ~tent ~actiOn by the as-grown TaSe3 was ~~n Wit~ the reported structure [1]. The ~>Jppe~power of (400) plane in the TaSe3 
:•ttor9():· expo~ure to NzfL with 12 Torr at 
~!ercaJated .m. This suggests that N2fit must be 
f"!onaJ of ~n between the layers along the 
i tbe t e a- and c-axes. The stoichiometry 
, ' complex f d T
.e:er:ninect b . orme aSeJ(Nz~)x was 
))e "-- YWeight gain measurements [8].
"'"1-'tndence of th~!>sure of N . e rate of weight gain vs. 
1:::etics r 2~ Is shown in fig. 2. Different
" or the 	pr~e condir essure of NziL suggests that 
.. IOns 	 of th . ~·~nre r • e Intercalation in the low
"- egtons are 
-e high pr more gentle than those in 
"""' " essure regio w· h" .;{'JSUre to H2J-4 _ ns. It m mmutes of ~-.lorr of Nu ' x - 1/3, but after 48 h under 
2~ben the sa '"' the value of x is equal to one.> rnple is 	 .~' llllmediatel evacuated, x ts reduced to 
TaSe3 (~t) • x N2H4(g) - TaSe3 (N 2 H4lx (t&) 
(mp =k <x..-x> 
u
.. 
Ill 
)( 
""" c: 
k=const P" 
-sL-~-L~-J--~~~~~ 
1 	 1.2 1.4 1.6 1.8 
In (PI TORR) 
Fig. 2. Kinetics of intercalation vs. pressure of Nzl4 x .is the 
ratio of moles of N2JL to the moles of TaSe3. x., 1s the 
extrapolated value as time, t, -+oo. Here the same sample .was 
intercalated and deintercalated several times for a gtven 
pressure and each point indicates an average. 
intercalated sample, TaSe3(N2~)x, does not. al­
low a structure determination becaus: the hnes 
are very broad, as shown in fig. 3. Tins suggests 
the formation of complex superstructur:fs. 
(12 T ·24°C) theOn exposure to Nz& vapor . orr, 
resistance decreases with the ttme to a c.onstant 
value 30% less than the initial value. Tins value 
. d when the pressure was reduced to remru~ 	 . . 
10-4Torr. 	The result of the change m the rests-
I I I , ' J 
. . 4s . . . . io . . . . 35 30 
28(CuK<1ll DEG­
·:11.. .t:: 1/J y and after 48 h under 1o-s Torr of 	 TaS and its intercalated Fig. 3. X·ray reflecting power of CJ
. However X d"ff .
' -ray 1 	 ract10n by the sample, TaSeJ(NzlL) •. 
' ' ' ' 
.f • • • • • • • ••• •1.0 
: 
: 
......0 
' 2.0 3.0 400 10 
T(K) 
K. Yamaya et al./NzH4 intercalation on TaSe3446 
tance is consistent with that in X-ray diffraction 
by the intercalated samples. The temperature 
dependence of the resistivity has been measured 
on four intercalated samples. Two of them (A 
and B) have been intercalated under a pressure 
of N2H. at 12 Torr and other samples (E and F) 
have been intercalated under a pressure of N21L 
at 1 Torr. As shown in fig. 4, the dependence of 
the resistivity vs. temperature in TaSe3(N2~)x-F 
is almost the same as that of TaSe3, i.e., resis­
tance decreao;es monotonically as temperature 
decreases and shows negative curvature. The 
same result is also obtained for E. Also, the 
onset temperature for superconducting transition 
is the same as that of TaSe3, as shown in fig. 5. 
Thus, no significant changes in the resistivity and 
T. are observed in the E- and F-samples exposed 
to N2"-* under low pressure. On the other hand, 
the temperature dependence of resistivity in 
TaSeJ(NzlL)x-B intercalated under the pressure 
of N2"-* at 12 Torr, which is the same as that of 
the A-sample, is quite different from that 
obtained in TaSe3 [1], as shown in fig. 6. The 
main differences are as follows. (1) An anomaly 
near 100 K is observed in the intercalated sam­
ples. (2) The positive curvature against tern­
·r· curves ofFig. 5. The superconducting transtton 
TaSe3(N2fu).-E and -F. 
perature in resistivity vs. temperature is o~served 
above 120 K, in contrast with the negal!ve ~ 
vature obtained in TaSe3 [1]. (3) The valu: h 
RRR varies from 60 to 5. Furthermore, T, 0 t e 
. b d to decreasemtercalated samples are o serve . 
· fi 7 The res:s­from 2 2 to 1.5 K as shown m g. · ht
• ' . • ·1 to t ativity anomaly observed here ts stmt ar ed. 
· observ Ill
associated with the CDW formatton 
· · t calated com­dichalcogenides and thetr tn ef 
~ 
~ "' 
It) 
cr: 
.... 
1­
-
cr: 
1.0 
.8 
. 6 
.· 
100 
.. 
.·· 
.· 
... 
.. 
T(ll) fl~function o 
Fig. 6. The normalized resistance as. a h ws the "'" 
Fig. 4. The normalized resistance as a function of tem­ s rd h.ne s 0 perature in TaSeJ(NzfL),-B. 0 1 • T Selperature in TaSe3(NzH.).-E. · n a · perature dependence of the reststance 1 
0 
I 
1-01-	 ca• o oa .... 
i •
. 
& 
i ' 
.; 
··.· 
oG• 	
"' 
• 
• 
-·· 
I 
0 1-0 2-0 3-0 
K. 	Yamaya et al./N2H4 intercalation on TaSe3 447 
­
­
T(K) 
fig. 7. The superconducting transition curves of 
TaSeJ(Nllf.),-A (0); -B (&); and TaSe3 (e). 
pounds [5-7]. The interlayer overlap of electron 
wave function in TaSe3 can be expected to be 
reduced by the intercalation. Thus, the resistivity 
anomaly observed in the intercalated samples (A 
and B) suggests that CDW are produced and that ~e:e in tum suppress the superconductivity.
15 
result is consistent with the fact observed in ~~lin which the enhancement of superconduc­b\1~ leads to suppression of the CDW for­
mallon Ho
ob · wever, much more work such as an 
di serv~tion of the formation of perlodic lattice S!ort10ns a d 
. n measurements of Hall effect and 
magnetic susc 'b'l'COnfirm epb 1 1ty, will be necessary to 
Also 't. t~e COW formation in TaSe3(N214)x­
, 1 Is Important t . . .
observed h . o Investigate 1f the anomaly 
"ilicb h ere Is due to the weakly pinned CDW 
ad been already observed in NbSe [9].3 
Acknowledgements 
The work was supported in part by NSF DMR 
77033 at San Jose State University and by 
AFOSR 49620-78-C0009 at Stanford University. 
One of us (K.Y.) wishes to thank RCA for a 
Research Grant. 
References 
[l] 	T. Sambongi, M. ldo, K. Tsutsumi, M. Yamamoto, T . 
Takoshima and Y. Abe, Proc. Int. Conf. Quasi One­
Dimensional Conductors, vol. 1, S. Barisic, A. Bjelis, 
J.R. Cooper and B. Leonie, eds. (Springer-Verlag, Berlin, 
1979), p. 349. 
[2) 	J. Chaussy, P. Haen, J.C. Lasjaunias, P. Mon~eau, G. 
Waysand, A. Waintal, A. Meerschaut, P. Molinie and J. 
Rouxel, Solid State Commun. 20 (1975) 759. 
[3] 	K. Tsutsumi, T. Takagaki, M. Yamamoto, Y. Shiozaki, 
M. Ido, T. Sambongi, K. Yamaya andY. Abe, Phys. Rev. 
Lett. 39 (1977) 1675. 
[4) M.Yamamoto, J. Phys. Soc. Japan 45 (1978) 431. 
K. Yarnaya, T.H. Geballe, J.F. Kwak and R.L. Greene, 
Solid State Commun. 31 (1979) 6TT. 
[5) A.H. Thompson, F.R. Gamble and R.F. Koehler Jr., 
Phys. Rev. B5 (1972) 2811. 
[6) S.F. Meyer, R.E. Howard, G.R. Stewart, J.V. Acrivos 
and T.H. Geballe, J. Chern. Phys. 62 (1975) 4411. 
[7) 	 D.W. Murphy, FJ. DiSalvo, G.W. Hull Jr., J.V. W~­
czak, S.F. Mayer, G.R. Stewart, S. Early, J.V. Acrivos 
and T.H: Geballe, J. Chern. Phys. 62 (1975) 967. 
[8] 	J.V. Acrivos, C. Delios, N.Y. TtlpSOe and J.R. Salem. J. 
Phys. Chern. 79 (1975) 3003. 
[9) P. Mon~eau, N.P. Ong, A.M. Portis, A. Meerschaut and 
J. Rouxe1, Phys. Rev. Lett. 37 (1976) 602. 
J. Richard and P. Mon~eau, Solid State Commun. 33 
(1980) 635. 


Effects of N2H4 on the Transition Temperature in the Anisotropic Superconductor TaSe3

SJSU ScholarWorks

San Jose State UniversitySJSU ScholarWorksFaculty Publications, Chemistry Chemistry1-1-1981Effects of N2H4 on the Transition Temperature inthe Anisotropic Superconductor TaSe3K. YamayaHokkaido UniversityT. H. GeballeStanford UniversityJuana Vivó AcrivosSan Jose State University, juana.acrivos@sjsu.eduJ. CodeSan Jose State UniversityFollow this and additional works at: https://scholarworks.sjsu.edu/chem_pubPart of the Physical Chemistry CommonsThis Article is brought to you for free and open access by the Chemistry at SJSU ScholarWorks. It has been accepted for inclusion in FacultyPublications, Chemistry by an authorized administrator of SJSU ScholarWorks. For more information, please contact scholarworks@sjsu.edu.Recommended CitationK. Yamaya, T. H. Geballe, Juana Vivó Acrivos, and J. Code. "Effects of N2H4 on the Transition Temperature in the AnisotropicSuperconductor TaSe3" Physica (1981): 444-447. doi:10.1016/0378-4363(81)90292-8Physica 105B (1981) 444-447 North-Holland Publishing Company EFFECT OF N2H., INTERCALATION ON THE TRANSITION TEMPERATURE AND ELECTRON TRANSPORT IN ANISOTROPIC SUPERCONDUCTOR: TaSe3 K. YAMAYA, T.H. GEBALLE*, J.V. ACRIVOSt and J. CODEt Dtpartmmt of Nuclear Engineering, Hokkaido University, Sapporo, Japan •Department of Applied Physics, Stanford University, Stanford, California 94305, USA t Department of Chemistry, San Jose State University, San Jose, California 95192, USA We have intercalated TaSe3 with N2~. The room temperature resistance Rb(RT) along the b-aJds decreases b! J;~ during the reaction. The ratio of Rb(RT)!Rb(4.2 K) varies from 60 in TaSe3 to 5 in the intercalated samples. An anom~o • Rb is observed near 100 K. It is suggested that this anomaly is due to the formation of charge-density-wave (CDW). ~ superconduct~n.g transition temperature, Tc. is suppressed from 2.2 to 1.5 K. The correlation betwe~n the_suppr~~ superconducttVIty and the formation of CDW is discussed as compared with the result obtamed m the · dichalcogenides. I. Introduction large anisotropy rather than a one-dimensior.i system. a! ed IIi'' MX2  is well known to be interc at Th:6organic molecules and hydrogen 15: 1· f ~: enhancement of Tc and the suppression °- ,;. · anv tn•"d 1CDW formations were observe n m ~ ..,[5 6) Jt 1 "~ calated compounds of MXz ' · . IS eff~; . . . . t the intercalatiOnniterestmg to mveshga e . TaSeJ and" on Tc and the electron transport I~ MX,. n: compare them with the e1Ie~t 10 we; e!t;· measurements of X-ray reflectmg po · 0 ..,_ t0 .:... cA T Se The slllanStructure of a ;.Fi•g. 1. The crystal circles identify Ta (Se) atoms. The trichalcogenides of niobium and tantalum MXJ, have been investigated extensively becaus~ Of _their low-dimensional characters. Although thetr crystal structures are similar, their electron transport properties show significant differences [1). NbSe3 shows two charge-density-wave (CDW) tr~nsitions at 142 and 85 K [2] and TaS3 shows .Pe1erls . transition at 220 K [3]. No anomahes assoCiated with low-dimensional phase transition have been observed in Tase [l]. In 3 fact, TaSeJ is a superconductor with a T. of 2( :t0.5)K [1, 4]. The reasonable interpreta~ion for the absence of the structural phase t 't'i T S · rans1 ton n a e3 IS that the interchain overlap of electron Wave functions is larger than that of other MX Compounds. 3 u As s~ow~ in fig._l, TaSe3 has a structure made p of ~nfimte chams of trigonal prisms, TaSe6, extendmg paraii~I to the b-axis. Ta in TaSe3 is surrou?ded by ~lght Se atoms forming a bicap­~d tngonal pnsm. According to this point of VIew we have to co ·dT nsi er 1ayers made of coupled :seJ_fibe~. Between them lies a Van der Waals g p With dimensions close to th f hdichal . ose o t e layered 'dcogedmdes, MXz. TaSeJ, therefore, can be COn Sl ere as a two-dimensional . . system wtth a ' 0378-4363/81/0000-(){)()()j$? 50 -· ©North-Holland Publishing Company and Yamada Science Foundation 445 K. Yamaya et al./N2H4 intercalation on TaSe3 :i:al resistivity, and Tc in TaSe3, when this is ~d to N2~, are reported in this paper. Tc is ~d to be suppressed on intercalation of NzfL ~Jan anomaly in the resistivity is observed near R The correlation between the suppression 1T, and an anomaly in resistivity is compared r1l that of intercalation on MX2 and discussed. ! Experiments TaSeJwere grown by the transport method, as :![llrted in (4]. The resistance ratios, RRR, Riroom temperature)/R(4.2 K), and Tc of the ;:\i!als were confirmed to be the same values as :C!erved in previous works [1, 4]. The resistivity :t samples was measured by a four-probe ::ethod along the b-axis with a de current. ~~conductivity was detected by the resistivity :tasurements. The X-ray diffraction and trans­; ~easurements of TaSe3 exposed to N 2fL l;IJr m the absence of air were carried out ;ng the method already developed for TaS [7].21 le measurements of the temperature depen­hce of the 	 · · · · reststlVlty and T. m the samplesttre carried 	 t d c , . ou un er He gas atmosphere to •·ctd the reaction with air. 1Result and discussion X-ray diff . ~tent ~actiOn by the as-grown TaSe3 was ~~n Wit~ the reported structure [1]. The ~>Jppe~power of (400) plane in the TaSe3 :•ttor9():· expo~ure to NzfL with 12 Torr at ~!ercaJated .m. This suggests that N2fit must be f"!onaJ of ~n between the layers along the i tbe t e a- and c-axes. The stoichiometry , ' complex f d T.e:er:ninect b . orme aSeJ(Nz~)x was ))e "-- YWeight gain measurements [8]."'"1-'tndence of th~!>sure of N . e rate of weight gain vs. 1:::etics r 2~ Is shown in fig. 2. Different" or the 	pr~e condir essure of NziL suggests that .. IOns 	 of th . ~·~nre r • e Intercalation in the low"- egtons are -e high pr more gentle than those in """' " essure regio w· h" .;{'JSUre to H2J-4 _ ns. It m mmutes of ~-.lorr of Nu ' x - 1/3, but after 48 h under 2~ben the sa '"' the value of x is equal to one.> rnple is 	 .~' llllmediatel evacuated, x ts reduced to TaSe3 (~t) • x N2H4(g) - TaSe3 (N 2 H4lx (t&) (mp =k <x..-x> u.. Ill )( """ c: k=const P" -sL-~-L~-J--~~~~~ 1 	 1.2 1.4 1.6 1.8 In (PI TORR) Fig. 2. Kinetics of intercalation vs. pressure of Nzl4 x .is the ratio of moles of N2JL to the moles of TaSe3. x., 1s the extrapolated value as time, t, -+oo. Here the same sample .was intercalated and deintercalated several times for a gtven pressure and each point indicates an average. intercalated sample, TaSe3(N2~)x, does not. al­low a structure determination becaus: the hnes are very broad, as shown in fig. 3. Tins suggests the formation of complex superstructur:fs. (12 T ·24°C) theOn exposure to Nz& vapor . orr, resistance decreases with the ttme to a c.onstant value 30% less than the initial value. Tins value . d when the pressure was reduced to remru~ 	 . . 10-4Torr. 	The result of the change m the rests-I I I , ' J . . 4s . . . . io . . . . 35 30 28(CuK<1ll DEG­·:11.. .t:: 1/J y and after 48 h under 1o-s Torr of 	 TaS and its intercalated Fig. 3. X·ray reflecting power of CJ. However X d"ff .' -ray 1 	 ract10n by the sample, TaSeJ(NzlL) •. ' ' ' ' .f • • • • • • • ••• •1.0 : : ......0 ' 2.0 3.0 400 10 T(K) K. Yamaya et al./NzH4 intercalation on TaSe3446 tance is consistent with that in X-ray diffraction by the intercalated samples. The temperature dependence of the resistivity has been measured on four intercalated samples. Two of them (A and B) have been intercalated under a pressure of N2H. at 12 Torr and other samples (E and F) have been intercalated under a pressure of N21L at 1 Torr. As shown in fig. 4, the dependence of the resistivity vs. temperature in TaSe3(N2~)x-F is almost the same as that of TaSe3, i.e., resis­tance decreao;es monotonically as temperature decreases and shows negative curvature. The same result is also obtained for E. Also, the onset temperature for superconducting transition is the same as that of TaSe3, as shown in fig. 5. Thus, no significant changes in the resistivity and T. are observed in the E- and F-samples exposed to N2"-* under low pressure. On the other hand, the temperature dependence of resistivity in TaSeJ(NzlL)x-B intercalated under the pressure of N2"-* at 12 Torr, which is the same as that of the A-sample, is quite different from that obtained in TaSe3 [1], as shown in fig. 6. The main differences are as follows. (1) An anomaly near 100 K is observed in the intercalated sam­ples. (2) The positive curvature against tern­·r· curves ofFig. 5. The superconducting transtton TaSe3(N2fu).-E and -F. perature in resistivity vs. temperature is o~served above 120 K, in contrast with the negal!ve ~ vature obtained in TaSe3 [1]. (3) The valu: h RRR varies from 60 to 5. Furthermore, T, 0 t e . b d to decreasemtercalated samples are o serve . · fi 7 The res:s­from 2 2 to 1.5 K as shown m g. · ht• ' . • ·1 to t ativity anomaly observed here ts stmt ar ed. · observ Illassociated with the CDW formatton · · t calated com­dichalcogenides and thetr tn ef ~ ~ "' It) cr: .... 1­-cr: 1.0 .8 . 6 .· 100 .. .·· .· ... .. T(ll) fl~function o Fig. 6. The normalized resistance as. a h ws the "'" Fig. 4. The normalized resistance as a function of tem­ s rd h.ne s 0 perature in TaSeJ(NzfL),-B. 0 1 • T Selperature in TaSe3(NzH.).-E. · n a · perature dependence of the reststance 1 0 I 1-01-	 ca• o oa .... i •. & i ' .; ··.· oG• 	"' • • -·· I 0 1-0 2-0 3-0 K. 	Yamaya et al./N2H4 intercalation on TaSe3 447 ­­T(K) fig. 7. The superconducting transition curves of TaSeJ(Nllf.),-A (0); -B (&); and TaSe3 (e). pounds [5-7]. The interlayer overlap of electron wave function in TaSe3 can be expected to be reduced by the intercalation. Thus, the resistivity anomaly observed in the intercalated samples (A and B) suggests that CDW are produced and that ~e:e in tum suppress the superconductivity.15 result is consistent with the fact observed in ~~lin which the enhancement of superconduc­b\1~ leads to suppression of the CDW for­mallon Hoob · wever, much more work such as an di serv~tion of the formation of perlodic lattice S!ort10ns a d . n measurements of Hall effect and magnetic susc 'b'l'COnfirm epb 1 1ty, will be necessary to Also 't. t~e COW formation in TaSe3(N214)x­, 1 Is Important t . . .observed h . o Investigate 1f the anomaly "ilicb h ere Is due to the weakly pinned CDW ad been already observed in NbSe [9].3 Acknowledgements The work was supported in part by NSF DMR 77033 at San Jose State University and by AFOSR 49620-78-C0009 at Stanford University. One of us (K.Y.) wishes to thank RCA for a Research Grant. References [l] 	T. Sambongi, M. ldo, K. Tsutsumi, M. Yamamoto, T . Takoshima and Y. Abe, Proc. Int. Conf. Quasi One­Dimensional Conductors, vol. 1, S. Barisic, A. Bjelis, J.R. Cooper and B. Leonie, eds. (Springer-Verlag, Berlin, 1979), p. 349. [2) 	J. Chaussy, P. Haen, J.C. Lasjaunias, P. Mon~eau, G. Waysand, A. Waintal, A. Meerschaut, P. Molinie and J. Rouxel, Solid State Commun. 20 (1975) 759. [3] 	K. Tsutsumi, T. Takagaki, M. Yamamoto, Y. Shiozaki, M. Ido, T. Sambongi, K. Yamaya andY. Abe, Phys. Rev. Lett. 39 (1977) 1675. [4) M.Yamamoto, J. Phys. Soc. Japan 45 (1978) 431. K. Yarnaya, T.H. Geballe, J.F. Kwak and R.L. Greene, Solid State Commun. 31 (1979) 6TT. [5) A.H. Thompson, F.R. Gamble and R.F. Koehler Jr., Phys. Rev. B5 (1972) 2811. [6) S.F. Meyer, R.E. Howard, G.R. Stewart, J.V. Acrivos and T.H. Geballe, J. Chern. Phys. 62 (1975) 4411. [7) 	 D.W. Murphy, FJ. DiSalvo, G.W. Hull Jr., J.V. W~­czak, S.F. Mayer, G.R. Stewart, S. Early, J.V. Acrivos and T.H: Geballe, J. Chern. Phys. 62 (1975) 967. [8] 	J.V. Acrivos, C. Delios, N.Y. TtlpSOe and J.R. Salem. J. Phys. Chern. 79 (1975) 3003. [9) P. Mon~eau, N.P. Ong, A.M. Portis, A. Meerschaut and J. Rouxe1, Phys. Rev. Lett. 37 (1976) 602. J. Richard and P. Mon~eau, Solid State Commun. 33 (1980) 635. 

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Effects of N2H4 on the Transition Temperature in the Anisotropic Superconductor TaSe3

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