In our paper we study effect of Mn for Fe substitution on magnetic properties of NdFex-1MnxO3 compounds for x = 0 and 0.1, which have been grown by the OFZ technique. The Neel temperature decreases from T-N1 = 691 K to T-N1 = 621 K, and the anomaly in AC susceptibility, related to spin reorientation, vanishes with Mn substitution. Low temperature heat capacity measurement for sample with x = 0.1 revealed that substitution of Mn for Fe shifts a Schottky-type anomaly at T-sh to higher temperatures. Another anomaly is generated by doping at T-max = 11 K. The anomaly is smeared out by magnetic field, confirming its magnetic origin.15th Czech and Slovak Conference on Magnetism (CSMAG), Jun 17-21, 2013, Kosice, Slovaki

Briancin, J.

Fitta, M.

Kovač, Janez

Kusigerski, Vladan

Lazurova, J.

Mihalik, Jr., M.

Mihalik, M.

Zentkova, M.

Acta Physica Polonica A

VinaR - Repository of the Vinča Institute of Nuclear Sciences

Vol. 126 (2014) ACTA PHYSICA POLONICA A No. 1
Proceedings of the 15th Czech and Slovak Conference on Magnetism, Ko²ice, Slovakia, June 1721 2013
Magnetic Properties of NdFe0.9Mn0.1O3
M. Zentkováa,∗, J. Lazúrováa, J. Ková£a, M. Mihalika, M. Mihalik jr.a, J. Brian£inb,
M. Fittac, V. Kusigerskid
aInstitute of Experimental Physics SAS, Watsonova 47, 040 01 Ko²ice, Slovakia
bInstitute of Geotechnics SAS, Watsonova 45, 040 01 Ko²ice, Slovakia
cInstitute of Nuclear Physics, Polish Academy of Sciences, Radzikowskiego 152, Kraków, Poland
dThe Vinca Institute, University of Belgrade, PO BOX 522, 11001 Belgrade, Serbia
In our paper we study eﬀect of Mn for Fe substitution on magnetic properties of NdFex−1MnxO3 compounds
for x = 0 and 0.1, which have been grown by the OFZ technique. The Néel temperature decreases from TN1 = 691 K
to TN1 = 621 K, and the anomaly in AC susceptibility, related to spin reorientation, vanishes with Mn substitution.
Low temperature heat capacity measurement for sample with x = 0.1 revealed that substitution of Mn for Fe shifts
a Schottky-type anomaly at Tsh to higher temperatures. Another anomaly is generated by doping at Tmax = 11 K.
The anomaly is smeared out by magnetic ﬁeld, conﬁrming its magnetic origin.
DOI: 10.12693/APhysPolA.126.306
PACS: 75.50.y, 75.47.Lx, 75.30.m, 75.30Kz, 75.30.Et, 75.30.Cr
Magnetic properties of NdFeO3 are mostly determined
by three magnetic interactions (Fe-Fe, Fe-Nd and Nd-
Nd), which are present in this material. Magnetic or-
dering of Fe3+ ions creates a canted antiferromagnetic
ordering below the Néel temperature at about TN1 =
690 K [1]. Upon cooling the magnetic moments of Fe3+
exhibit reorientation from the a-axis to the c-axis in the
spin reorientation region (103165 K) [2]. Low tem-
perature heat capacity measurements revealed a Shot-
tky anomaly at about 2 K and a sharp maximum at
TN2 = 1.05 K [3]. Neutron diﬀraction measurements
conﬁrmed magnetic ordering for Nd-Fe sublattice below
1 K and long-range ordering due to Nd-Nd interaction
below 0.4 K [4, 5]. In our paper we study the eﬀect of
Mn substitution for Fe in NdFeO3.
NdFex−1MnxO3 ingots with x = 0.0 and 0.1 have
been grown by the optical ﬂoating zone (OFZ) tech-
nique in the four mirrors furnace. The X-ray powder
diﬀraction pattern and EDX analysis taken from the top
and the end of ingots revealed that samples are single
phase materials. Both samples adopt orthorhombic crys-
tal structure (space group Pbnm) with lattice parameters
a = 5.5889(2) nm, b = 7.7619(3) nm, c = 5.4521(2) nm
for x = 0 and a = 5.6011(9) nm, b = 7.748(8) nm,
c = 5.4483(9) nm for x = 0.1, respectively. Magneti-
zation and AC susceptibility were measured on a SQUID
magnetometer on MPMS in temperatures range from 2
to 720 K and magnetic ﬂux density up to 5 T. Mea-
surements of heat capacity were performed on PPMS in
temperature range from 2 K to 200 K and in magnetic
ﬁelds up to 3 T.
Transition from paramagnetic to canted antiferromag-
netic state is accompanied with sharp peak in µ(T ) curves
∗corresponding author; e-mail: zentkova@saske.sk
Fig. 1. Low temperature magnetization of
NdFe0.9Mn0.1O3 was measured in ZFC and FC
regimes; inset shows high temperature magnetization
for both samples in vicinity of the Néel temperature.
(see inset of Fig. 1), which can be attributed to Hopkin-
son eﬀect. Such a peak is a very characteristic feature
shown by a number of ferromagnetic materials. In our
case this peak indicates that ferromagnetic component
can be strong. The Néel temperature decreases from
691 K to 621 K with Mn doping. The spin reorienta-
tion in the sample with x = 0.1 is indicated by steep
decrease of magnetization in the range between 150 K
and 125 K (Fig. 1), but the relatively ﬂat curve down to
15 K is unusual in comparison with NdFeO3. The rise
of magnetization below 15 K indicates increasing Nd-Fe
magnetic interactions which start to develop at higher
temperature in comparison with NdFeO3.
The spin reorientation is not accompanied by
any anomaly in the AC in phase susceptibility of
NdFe0.9Mn0.1O3 (Fig. 2.) or out of phase susceptibil-
ity. Frequency dependent anomaly in the AC susceptibil-
(306)
Magnetic Properties of NdFe0.9Mn0.1O3 307
Fig. 2. In phase AC susceptibility of NdFe0.9Mn0.1O3;
inset shows frequency dependence of the in phase AC
susceptibility for NdFeO3.
Fig. 3. Hysteresis loops for NdFe0.9Mn0.1O3 above the
spin reorientation transition.
ity (in phase data) is a characteristic feature of NdFeO3
(see inset of Fig. 2). It seems that doping with Mn
changes mechanism of spin reorientation. Small anomaly
at Tmax = 12 K, marked by the arrow, we associated
with new magnetic ordering in NdFe0.9Mn0.1O3.
Large area of hysteresis loop indicating ferromagnetic
contribution is typical for NdFe0.9Mn0.1O3 above the
spin reorientation transition (Fig. 3). The shape of loop
changes on cooling: the area of loop is negligible in range
between 110 K and 15 K, high ﬁeld susceptibility in-
creases rapidly. In the vicinity of second magnetic tran-
sition the area of loop increases and the loop changes its
shape reﬂecting creation of ferromagnetic interaction in
the sample (Fig. 4).
Substitution of Mn for Fe shifts the Schottky-
type anomaly from Tsh = 2 K for NdFeO3 [3] to
higher temperatures, reaching value Tsh = 2.76 K for
NdFe0.9Mn0.1O3. Another anomaly at about Tmax =
11 K is generated by doping. The anomaly is smeared
out by magnetic ﬁeld, conﬁrming magnetic origin of the
anomaly (Fig. 5).
In conclusion, the substitution of Mn for Fe shifts the
Shottky-type anomaly to higher temperatures and re-
Fig. 4. Hysteresis loops for NdFe0.9Mn0.1O3 below the
spin reorientation transition.
Fig. 5. Temperature dependence of heat capacity
shows a Shottky-type of anomaly at TN2 and another
anomaly at Tmax.
duces Fe-Fe magnetic interactions leading to a decrease
of TN1. Anomalies in AC susceptibility and heat capac-
ity data at Tmax indicate new magnetic interactions in
NdFex−1MnxO3.
This work was supported by the projects
VEGA2/0178/13, APVV-0132-11, SK-SRB-0054-11 and
ERDF EU under the contracts No. ITMS26220120005,
No. ITMS26220120047.
References
[1] K.P. Belov, A.M. Kadomtseva, T.L. Ovchinnikova,
V.A. Timofeeva, V.V. Uskov, Sov. Phys. Sol. Stat
13, 518 (1971).
[2] I. Sosnowska, E. Steichele, A. Hewat, Physica B 136,
394 (1986).
[3] F. Bartolomé, M.D. Kuz'min, J. Bartolomé, J. Blasco,
J. García, F. Sapina, Sol. Stat. Commun. 91, 177
(1994).
[4] R. Przeniosªo, I. Sosnowska, P. Fischer, W. Marti,
F. Bartolomé, J. Bartolomé, E. Palacios, R. Sonntag,
J. Mag. Mag. Mater. 160, 370 (1996).
[5] J. Bartolomé, E. Palacios, M.D. Kuz'min, F. Bar-
tolomé, I. Sosnowska and R. Przeniosªo, R. Sonntag,
M.M. Lukina, Phys. Rev. B 55, 11432 (1997).


Magnetic Properties of NdFe0.9Mn0.1O3

In our paper we study effect of Mn for Fe substitution on magnetic properties of $NdFe_{x-1}Mn_{x}O_{3}$ compounds for x=0 and 0.1, which have been grown by the OFZ technique. The Néel temperature decreases from $T_{N1}$=691 K to $T_{N1}$=621 K, and the anomaly in AC susceptibility, related to spin reorientation, vanishes with Mn substitution. Low temperature heat capacity measurement for sample with x=0.1 revealed that substitution of Mn for Fe shifts a Schottky-type anomaly at $T_{sh}$ to higher temperatures. Another anomaly is generated by doping at $T_{max}$=11 K. The anomaly is smeared out by magnetic field, confirming its magnetic origin

Zentková, M.

Lazúrová, J.

Kováč, J.

Briančin, J.

Kusigerski, V.

Biblioteka Nauki - repozytorium artykuÅÃ³w

Magnetic Properties of $NdFe_{0.9}Mn_{0.1}O_{3}$

M. Zentková

J. Lazúrová

J. Kováč

M. Mihalik

J. Briančin

M. Fitta

V. Kusigerski

Crossref

Magnetic Properties of NdFe_{0.9}Mn_{0.1}O_{3}

Repository of the Vinča Nuclear Institute (VinaR)

Vol. 126 (2014) ACTA PHYSICA POLONICA A No. 1Proceedings of the 15th Czech and Slovak Conference on Magnetism, Ko²ice, Slovakia, June 1721 2013Magnetic Properties of NdFe0.9Mn0.1O3M. Zentkováa,∗, J. Lazúrováa, J. Ková£a, M. Mihalika, M. Mihalik jr.a, J. Brian£inb,M. Fittac, V. KusigerskidaInstitute of Experimental Physics SAS, Watsonova 47, 040 01 Ko²ice, SlovakiabInstitute of Geotechnics SAS, Watsonova 45, 040 01 Ko²ice, SlovakiacInstitute of Nuclear Physics, Polish Academy of Sciences, Radzikowskiego 152, Kraków, PolanddThe Vinca Institute, University of Belgrade, PO BOX 522, 11001 Belgrade, SerbiaIn our paper we study eﬀect of Mn for Fe substitution on magnetic properties of NdFex−1MnxO3 compoundsfor x = 0 and 0.1, which have been grown by the OFZ technique. The Néel temperature decreases from TN1 = 691 Kto TN1 = 621 K, and the anomaly in AC susceptibility, related to spin reorientation, vanishes with Mn substitution.Low temperature heat capacity measurement for sample with x = 0.1 revealed that substitution of Mn for Fe shiftsa Schottky-type anomaly at Tsh to higher temperatures. Another anomaly is generated by doping at Tmax = 11 K.The anomaly is smeared out by magnetic ﬁeld, conﬁrming its magnetic origin.DOI: 10.12693/APhysPolA.126.306PACS: 75.50.y, 75.47.Lx, 75.30.m, 75.30Kz, 75.30.Et, 75.30.CrMagnetic properties of NdFeO3 are mostly determinedby three magnetic interactions (Fe-Fe, Fe-Nd and Nd-Nd), which are present in this material. Magnetic or-dering of Fe3+ ions creates a canted antiferromagneticordering below the Néel temperature at about TN1 =690 K [1]. Upon cooling the magnetic moments of Fe3+exhibit reorientation from the a-axis to the c-axis in thespin reorientation region (103165 K) [2]. Low tem-perature heat capacity measurements revealed a Shot-tky anomaly at about 2 K and a sharp maximum atTN2 = 1.05 K [3]. Neutron diﬀraction measurementsconﬁrmed magnetic ordering for Nd-Fe sublattice below1 K and long-range ordering due to Nd-Nd interactionbelow 0.4 K [4, 5]. In our paper we study the eﬀect ofMn substitution for Fe in NdFeO3.NdFex−1MnxO3 ingots with x = 0.0 and 0.1 havebeen grown by the optical ﬂoating zone (OFZ) tech-nique in the four mirrors furnace. The X-ray powderdiﬀraction pattern and EDX analysis taken from the topand the end of ingots revealed that samples are singlephase materials. Both samples adopt orthorhombic crys-tal structure (space group Pbnm) with lattice parametersa = 5.5889(2) nm, b = 7.7619(3) nm, c = 5.4521(2) nmfor x = 0 and a = 5.6011(9) nm, b = 7.748(8) nm,c = 5.4483(9) nm for x = 0.1, respectively. Magneti-zation and AC susceptibility were measured on a SQUIDmagnetometer on MPMS in temperatures range from 2to 720 K and magnetic ﬂux density up to 5 T. Mea-surements of heat capacity were performed on PPMS intemperature range from 2 K to 200 K and in magneticﬁelds up to 3 T.Transition from paramagnetic to canted antiferromag-netic state is accompanied with sharp peak in µ(T ) curves∗corresponding author; e-mail: zentkova@saske.skFig. 1. Low temperature magnetization ofNdFe0.9Mn0.1O3 was measured in ZFC and FCregimes; inset shows high temperature magnetizationfor both samples in vicinity of the Néel temperature.(see inset of Fig. 1), which can be attributed to Hopkin-son eﬀect. Such a peak is a very characteristic featureshown by a number of ferromagnetic materials. In ourcase this peak indicates that ferromagnetic componentcan be strong. The Néel temperature decreases from691 K to 621 K with Mn doping. The spin reorienta-tion in the sample with x = 0.1 is indicated by steepdecrease of magnetization in the range between 150 Kand 125 K (Fig. 1), but the relatively ﬂat curve down to15 K is unusual in comparison with NdFeO3. The riseof magnetization below 15 K indicates increasing Nd-Femagnetic interactions which start to develop at highertemperature in comparison with NdFeO3.The spin reorientation is not accompanied byany anomaly in the AC in phase susceptibility ofNdFe0.9Mn0.1O3 (Fig. 2.) or out of phase susceptibil-ity. Frequency dependent anomaly in the AC susceptibil-(306)Magnetic Properties of NdFe0.9Mn0.1O3 307Fig. 2. In phase AC susceptibility of NdFe0.9Mn0.1O3;inset shows frequency dependence of the in phase ACsusceptibility for NdFeO3.Fig. 3. Hysteresis loops for NdFe0.9Mn0.1O3 above thespin reorientation transition.ity (in phase data) is a characteristic feature of NdFeO3(see inset of Fig. 2). It seems that doping with Mnchanges mechanism of spin reorientation. Small anomalyat Tmax = 12 K, marked by the arrow, we associatedwith new magnetic ordering in NdFe0.9Mn0.1O3.Large area of hysteresis loop indicating ferromagneticcontribution is typical for NdFe0.9Mn0.1O3 above thespin reorientation transition (Fig. 3). The shape of loopchanges on cooling: the area of loop is negligible in rangebetween 110 K and 15 K, high ﬁeld susceptibility in-creases rapidly. In the vicinity of second magnetic tran-sition the area of loop increases and the loop changes itsshape reﬂecting creation of ferromagnetic interaction inthe sample (Fig. 4).Substitution of Mn for Fe shifts the Schottky-type anomaly from Tsh = 2 K for NdFeO3 [3] tohigher temperatures, reaching value Tsh = 2.76 K forNdFe0.9Mn0.1O3. Another anomaly at about Tmax =11 K is generated by doping. The anomaly is smearedout by magnetic ﬁeld, conﬁrming magnetic origin of theanomaly (Fig. 5).In conclusion, the substitution of Mn for Fe shifts theShottky-type anomaly to higher temperatures and re-Fig. 4. Hysteresis loops for NdFe0.9Mn0.1O3 below thespin reorientation transition.Fig. 5. Temperature dependence of heat capacityshows a Shottky-type of anomaly at TN2 and anotheranomaly at Tmax.duces Fe-Fe magnetic interactions leading to a decreaseof TN1. Anomalies in AC susceptibility and heat capac-ity data at Tmax indicate new magnetic interactions inNdFex−1MnxO3.This work was supported by the projectsVEGA2/0178/13, APVV-0132-11, SK-SRB-0054-11 andERDF EU under the contracts No. ITMS26220120005,No. ITMS26220120047.References[1] K.P. Belov, A.M. Kadomtseva, T.L. Ovchinnikova,V.A. Timofeeva, V.V. Uskov, Sov. Phys. Sol. Stat13, 518 (1971).[2] I. Sosnowska, E. Steichele, A. Hewat, Physica B 136,394 (1986).[3] F. Bartolomé, M.D. Kuz'min, J. Bartolomé, J. Blasco,J. García, F. Sapina, Sol. Stat. Commun. 91, 177(1994).[4] R. Przeniosªo, I. Sosnowska, P. Fischer, W. Marti,F. Bartolomé, J. Bartolomé, E. Palacios, R. Sonntag,J. Mag. Mag. Mater. 160, 370 (1996).[5] J. Bartolomé, E. Palacios, M.D. Kuz'min, F. Bar-tolomé, I. Sosnowska and R. Przeniosªo, R. Sonntag,M.M. Lukina, Phys. Rev. B 55, 11432 (1997).

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Magnetic Properties of NdFe0.9Mn0.1O3

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Magnetic Properties of NdFe0.9Mn0.1O3

Abstract

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Full text

Available Versions

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