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