A Study Of The Mechanism Of Suppression Of Superconductivity By Pr 3+ Substitution For Ba2+ In The Ybco(123) System

We present a systematic structural, transport, iodometric, susceptibility and x-ray photoemission study of the Y (Ba1-xPrx) 2Cu3O7-δ system for x ≤ 0.00,0.025,0.05,0.075 and 0.10 with Pr3+ (smaller in ionic radii but higher in valence than Ba2+) substituted at the Ba site. It is successfully shown that a higher valence cation can be substituted for a lower valence one. The rate of the Tc depression in these is observed to be much higher than that in the case when Pr3+ is substituted at the Y3+ site. This is explained as being due to a composite effect of the depletion of itinerant holes due to the progressive depletion of the oxygen content in the samples, the Pr 4f-O 2p hybridization and change in the in-plane coherence length (ξab) resulting from change in the in-plane atomic distances, using Ginzburg-Landau theory. © IOP Publishing Ltd.1932Wu, M.K., Ashburn, J.R., Torng, C.J., Meng, P.H., Geo, L., Huang, Z.J., Wang, Y.Q., Chu, C.W., (1987) Phys. Rev. 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Electrical Resistivity Under Extreme Conditions In The Ce 3ir4sn13 Heavy Fermion Compound

We have performed measurements of temperature dependent electrical resistivity ρ(T) under pressures up to 27 kbar and down to 0.1 K on single crystals of the Ce3Ir4Sn13 heavy fermion compound. At ambient pressure (P=0) we have identified in the ρ(T) data interesting features associated with the presence of crystalline field effects, magnetic correlations, Kondo single impurity scattering and, possibly, a low temperature structural phase transition. All these features were mapped as a function of pressure which allowed us to construct a pressure-temperature phase diagram with these temperature scales. We have also carried out measurements of ρ(T) as a function of magnetic fields up to H=8 T and the important temperature scales in ρ(T) were followed with field. Enlightened also by temperature dependent specific heat experiments we discuss the possible microscopic origins of the features found in our ρ(T) data. © 2013 Elsevier Ltd.177132135Remeika, J.P., Espinosa, G.P., Cooper, A.S., Barz, H., Rowell, J.M., McWhan, D.B., Vandenberg, J.M., Thomlinson, W., (1980) Solid State Commun., 34, p. 923Hodeau, J.L., Chenavas, J., Marezio, M., Remeika, J.P., (1980) Solid State Commun., 36, p. 839Agüero, O., (2007), Ph.D. thesis, Universidade Estadual de Campinas, Campinas, SP, BrazilZhong, G., Lei, X., Mao, J., (2009) Phys. Rev. B, 79, p. 094424Sato, H., Fukuhara, T., Iwasaki, S., Aoki, Y., Sakamoto, I., Takayanagi, S., Wada, N., (1993) Physica B, 186-188, p. 630Prires, M.A., Mendonça Ferreira, L., Duque, J.G.S., Urbano, R.R., Agüero, O., Torriani, I., Rettori, C., Pagliuso, P.G., (2006) J. Appl. Phys., 99, pp. 08J311Mendonça Ferreira, L., Bittar, E.M., Pires, M.A., Urbano, R.R., Agüero, O., Torriani, I., Rettori, C., Baggio-Saitovich, E., (2006) Physica B, 384, p. 332Mardegan, J.R.L., Aliouane, N., Coelho, L.N., Agüero, O., Bittar, E.M., Lang, J.C., Pagliuso, P.G., Giles, C., (2013) IEEE Trans. Magn., 49, p. 4652Hundley, M.F., Sarrao, J.L., Thompson, J.D., Movshovich, R., Jaime, M., Petrovic, C., Fisk, Z., (2002) Phys. Rev. B, 65, p. 024401Ghosh, K., Ramakrishnan, S., Chandra, G., (1993) Phys. Rev. B, 48, p. 10435Klintberg, L.E., Goh, S.K., Alireza, P.L., Saines, P.J., Tompsett, D.A., Logg, P.W., Yang, J., Grosche, F.M., (2012) Phys. Rev. Lett., 109, p. 237008Israel, C., Bittar, E.M., Aguero, O.E., Urbano, R.R., Rettori, C., Torriani, I., Pagliuso, P.G., Borges, H.A., (2005) Physica B, 359-361, p. 251Thomas, E.L., Lee, H.-O., Bankston, A.N., Maquilon, S., Klavins, P., Maldovan, M., Young, D.P., Chan, J.Y., (2006) J. Solid State Chem., 179, p. 1642Köhler, U., Pikul, A., Oeschler, N., Westerkamp, T., Strydom, A.M., Steglich, F., (2007) J. Phys. Condens. Matter, 19, p. 386207Ślebarski, A., White, B.D., Fijałkowski, M., Goraus, J., Hamlin, J.J., Maple, M.B., (2012) Phys. Rev. B, 86, p. 205113Takayanagi, S., Sato, H., Fukuhara, T., Wada, N., (1994) Physica B, 199-200, p. 49Nagoshi, C., Sugawara, H., Aoki, Y., Sakai, S., Kohgi, M., Sato, H., Onimaru, T., Sakakibara, T., (2005) Physica B, 359-361, p. 248Canfield, P.C., Fisk, Z., (1992) Philos. Mag. B, 65, p. 1117Yang, C.P., Chen, Y.H., Wang, H., Nagoshi, C., Kohgi, M., Sato, H., (2008) Appl. Phys. Lett., 92, p. 092504Bittar, E.M., (2006), M.Sc. thesis, Universidade Estadual de Campinas, Campinas, SP, BrazilCornut, D., Coqblin, B., (1972) Phys. Rev. B, 5, p. 4541Stewart, G.R., (1984) Rev. Mod. Phys., 56, p. 755Continentino, M.A., (2005) Braz. J. Phys., 35, p. 197Löhneysen, H.V., Rosch, A., Vojta, M., Wölfle, P., (2007) Rev. Mod. Phys., 79, p. 1015Christianson, A.D., Bauer, E.D., Lawrence, J.M., Riseborough, P.S., Moreno, N.O., Pagliuso, P.G., Sarrao, J.L., McQueeney, R.J., (2004) Phys. Rev. B, 70, p. 134505Collave, J.R., in pressChristianson, A.D., Goremychkin, E.A., Gardner, J.S., Kang, H.J., Chung, J.-H., Manuel, P., Thompson, J.D., Lawrence, J.M., (2008) Physica B, 403, p. 909Cornelius, A.L., Christianson, A.D., Lawrence, J.L., Fritsch, V., Bauer, E.D., Sarrao, J.L., Thompson, J.D., Pagliuso, P.G., (2006) Physica B, 378-380, p. 113Pagliuso, P.G., Moreno, N.O., Curro, N.J., Thompson, J.D., Hundley, M.F., Sarrao, J.L., Fisk, Z., Cornelius, A.L., (2002) Phys. Rev. B, 66, p. 054433Light, B.E., Kumar, R.S., Cornelius, A.L., Pagliuso, P.G., Sarrao, J.L., (2004) Phys. Rev. B, 69, p. 02441

Pressure-temperature-composition Phase Diagram Of Ce2 Min8 ( M = Rh, Ir )

In this work a preliminary pressure-temperature-composition phase diagram for the Ce2 Rh( 1 - x ) Irx In8 heavy-fermions (HF) materials is reported, built from pressure-dependent electrical resistivity ( ρ ( T ) ) measurements on single-crystalline samples. Although neither of the two end members is an ambient-pressure SC, a transition to a zero-resistance (ZR) state was found at ambient pressure ( TC ≈ 600 mK ) in a narrow Ir concentration range (around x = 0.5). Pressures not higher than 10 kbar are sufficient to suppress this ZR state for all measured concentrations, in contrast to the 115 materials. © 2006 Elsevier B.V. All rights reserved.378-380SPEC. ISS.423425Hegger, H., (2000) Phys. Rev. Lett., 84, p. 4986Petrovic, C., (2001) J. Phys. Condens. Matter, 13, pp. L337Petrovic, C., (2001) Europhys. Lett., 53, p. 354Pagliuso, P.G., (2001) Phys. Rev. B, 64, pp. 100503RNicklas, M., (2004) Phys. Rev. B, 70, p. 020505Mathur, N.D., (1998) Nature, 394, p. 39Moreno, N.O., (2002) Physica B, 312-313, p. 274Morris, G.D., (2004) Phys. Rev. B, 69, p. 214415Chen, G.F., (2002) J. Phys. Soc. Japan, 71, p. 2836Bianchi, A., (2001) Phys. Rev. B, 64, pp. 220504RNicklas, M., (2003) Acta Phys. Pol. B, 34, p. 90

Structural, Electronic And Magnetic Properties Of The Series Of Double Perovskites (ca, Sr)2-x Laxfeiro6

Polycrystalline samples of the series of double perovskites Sr2 -x LaxFeIrO6 were synthesized. Their structural, electronic and magnetic properties were investigated by X-ray powder diffraction, Mössbauer spectroscopy, magnetic susceptibility, heat capacity and electrical resistivity experiments. The compounds crystallize in a monoclinic structure and were fitted in space group P21/n, with a significant degree of Fe/Ir cationic disorder. As in Ca2-x LaxFeIrO6 the Sr-based system seems to evolve from an antiferromagnetic ground state for the end members (x=0.0 and x=2.0) to a ferrimagnetic order in the intermediate regions (x∼1). Since Mössbauer spectra indicate that Fe valence remains 3+ with doping, this tendency of change in the nature of the microscopic interaction could be attributed to Ir valence changes, induced by La3+ electrical doping. Upon comparing both Ca and Sr series, Sr2-x LaxFeIrO6 is more structurally homogenous and presents higher magnetization and transition temperatures. Magnetic susceptibility measurements at high temperatures on Sr1.2La0.8FeIrO6 indicate a very high ferrimagnetic Curie temperature TC∼700K. For the Sr 2FeIrO6 compound, electrical resistivity experiments under applied pressure suggest that this material might be a Mott insulator. © 2014 Elsevier Inc.2122329Jonker, G.H., Van Santen, J.H., (1950) Physica, 6, p. 337Salamon, M.B., Jaime, M., (2001) Rev. Mod. Phys., 73, p. 583Kobayashi, K.-I., Kimura, T., Sawada, H., Terakura, K., Tokura, Y., (1998) Nature, 395, p. 667Kobayashi, K.-I., Kimura, T., Tomioka, Y., Sawada, H., Terakura, K., Tokura, Y., (1999) Phys. Rev. B, 59, p. 11159Azimonte, C., Cesar, J.C., Granado, E., Huang, Q., Lynn, J.W., Campoy, J.C.P., Gopalakrishnan, J., Ramesha, K., (2007) Phys. Rev. Lett., 98, p. 017204Kim, T.H., Uehara, M., Cheong, S.-W., Lee, S., (1999) Appl. Phys. Lett., 74, p. 1737Wolf, S.A., Awschalom, D.D., Buhrman, R.A., Daughton, J.M., Von Molnár, S., Roukes, M.L., Chtchelkanova, A.Y., Treger, D.M., (2001) Science, 294, p. 1488Tovar, M., Causa, M.T., Butera, A., Navarro, J., Martinez, B., Fontcuberta, J., Passeggi, M.C.G., (2002) Phys. Rev. B, 66, p. 024409Azimonte, C., Granado, E., Cesar, J.C., Gopalakrishnan, J., Ramesha, K., (2007) J. Appl. Phys., 101, pp. 09H115Serrate, D., De Teresa, J.M., Ibarra, M.R., (2007) J. Phys.: Condens. Matter, 19, p. 023201Chang, H., García-Hernández, M., Retuerto, M., Alonso, J.A., (2006) Phys. Rev. B, 73, p. 104417Long, Y.-W., Kawakami, T., Chen, W.-T., Saito, T., Watanuki, T., Nakakura, Y., Liu, Q.-Q., Shimakawa, Y., (2013) Chem. Mater., 24, p. 2235Vasala, S., Lehtimaki, M., Huang, Y.H., Yamauchi, H., Goodenough, J.B., Karppinen, M., (2010) J. Solid State Chem., 183, p. 1007Bufaiçal, L., Mendonça Ferreira, L., Lora-Serrano, R., Agüero, O., Torriani, I., Granado, E., Pagliuso, P.G., Baggio-Saitovitch, E., (2008) J. Appl. Phys., 103, pp. 07F716Bufaiçal, L., Mendonça Ferreira, L., Lora-Serrano, R., Pagliuso, P.G., Caytuero, A., Baggio-Saitovitch, E., (2009) Physica B, 404, p. 3285Currie, R.C., Vente, J.F., Frikkee, E., Ijdo, D.J.W., (1995) J. Solid State Chem., 116, p. 199Battle, P.D., Blake, G.R., Gibb, T.C., Vente, J.F., (1999) J. Solid State Chem., 145, p. 541Qasim, I., Blanchard, P.E.R., Liu, S., Tang, C., Kennedy, B.J., Avdeev, M., Kimpton, J.A., (2013) J. Solid State Chem., 206, p. 242Larson, A.C., Von Dreele, R.B., General Structure Analysis System GSAS (2001) Los Alamos National Laboratory Report, USAToby, B.H., (2001) J. Appl. Crystallogr., 34, p. 210De Teresa, J.M., Serrate, D., Blasco, J., Ibarra, M.R., Morellon, L., (2004) Phys. Rev. B, 69, p. 144401Philipp, J.B., Majewski, P., Alff, L., Erb, A., Gross, R., Graf, T., Brandt, M.S., Sharma, D.D., (2003) Phys. Rev. B, 68, p. 144431King, G., Woodward, M., (2010) J. Mater. Chem., 20, p. 5785Goodenough, J.B., (1963) Magnetism and Chemical Bond, , Interscience New YorkLufaso, M.W., Woodward, P.M., (2001) Acta Crystallogr. B, 57, p. 725Abragam, A., Bleaney, B., (1970) EPR of Transition Ions, , Clarendon Press OxfordJarrett, H.S., Bouchard, R.J., Gillson, J.L., Jones, G.A., Marcus, S.M., Weiher, J.F., (1973) Mater. Res. Bull., 8, p. 87