Effects of Substituting La and Zn in Disordered Sr₂FeMoO₆
Main Article Content
Abstract
The Sr₂₋ₓLaₓFeMoO₆ (x = 0, 0.1, 0.2, 0.3, 0.4) and Sr₂Fe₁₋ₓZnₓMoO₆ (x = 0.05, 0.1, 0.15) samples were prepared using a sol-gel route followed by heat-treatment. X-ray diffraction (XRD), field-emission scanning electron microscope (FESEM) were employed to characterize phase formation and morphology. Magnetization curves in the temperature range 88–430 K were measured by means of a vibrating sample magnetometer (VSM) from which the magnetic moment at 0 K and Curie temperature were determined. The antisite disorder in the samples was evaluated based on the magnetic moment data and the substitution levels. The effects of La and Zn substitution on the magnetic parameters were discussed.
Keywords
Sr₂FeMoO₆, La and Zn substitution, magnetization, Curie temperature, antisite disorder
Article Details
References
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[2] J. Navarro, C. Frontera, L. Balcells, B. Martínez, and J. Fontcuberta; Raising the Curie temperature in Sr₂FeMoO₆ double perovskites by electron doping; Phys. Rev. B 64 (2001) 092411.
[3] D. Sánchez, J.A. Alonso, M. García‐Hernández, M.J. Martínez‐Lope, M.T. Casais, J.L. Martínez, M.T. Fernández‐Díaz; Electron and hole doping effects in Sr₂FeMoO₆ double perovskites; J. Magn. Magn. Mater. 272–276 (2004) 1732–1733.
[4] G. Narsinga Rao, Saibal Roy, Chung‐Yuan Mou, J.W. Chen; Effect of La doping on magnetotransport and magnetic properties of double perovskite Sr₂FeMoO₆ system; J. Magn. Magn. Mater. 299 (2006) 348–355.
[5] E.K. Hemery, G.V.M. Williams, H.J. Troadh; Isoelectronic and electronic doping in Sr₂FeMoO₆; J. Magn. Magn. Mater. 310 (2007) 1958–1960.
[6] Min Feng Lü, Jing Ping Wang, Jian Fen Liu, Wei Song, Xian Feng Hao, De Feng Zhou, Xiao Juan Liu, Zhi Jian Wu, Jian Meng; An investigation of low-field magnetoresistance in the double perovskites Sr₂Fe₁₋ₓZnₓMoO₆, x = 0, 0.05, 0.15 and 0.25; J. Phys.: Condens. Matter 18 (2006) 1601–1612.
[7] Xianjie Wang, Yu Sui, Qiuli Yang, Jinguang Cheng, Zhengnan Qian, Zhiguo Liu, Wenhui Su; Effect of doping Zn on the magnetoresistance of polycrystalline Sr₂FeMoO₆; J. Alloys Compd. 431 (2007) 6–9.
[8] R.D. Shannon; Revised effective ionic radii and systematic studies of interatomic distances in halides and chalcogenides; Acta Crystallogr. A 32 (1976) 751.
[9] O.N. Meetei, O. Erten, A. Mukherjee, M. Randeria, N. Trivedi, P. Woodward; Theory of half‐metallic double perovskites I. Double exchange mechanism; Phys. Rev. B 87 (2013) 1–7.
[10] Ll. Balcells, J. Navarro, M. Bibes, A. Roig, B. Martínez, J. Fontcuberta; Cationic ordering control of magnetization in Sr₂FeMoO₆ double perovskite; Appl. Phys. Lett. 78 (2001) 781.
[11] A.S. Ogale, S.B. Ogale, R. Ramesh, T. Venkatesan; Octahedral cation site disorder effects on magnetization in double‐perovskite Sr₂FeMoO₆: Monte Carlo simulation study; Appl. Phys. Lett. 75 (1999) 537.
[12] P. Schiffer, A.P. Ramirez, W. Bao, S.W. Cheong; Low temperature magnetoresistance and the magnetic phase diagram of La₁₋ₓCaₓMnO₃; Phys. Rev. Lett. 75 (1995) 3336–9.
[13] T. Saha‐Dasgupta, D.D. Sarma; Ab initio study of disorder effects on the electronic and magnetic structure of Sr₂FeMoO₆; Phys. Rev. B 64 (2001) 064408.
[14] D. Stoeffler, S. Colis; Oxygen vacancies and/or antisite imperfections in Sr₂FeMoO₆ double perovskites: an ab initio investigation; J. Phys.: Condens. Matter 17 (2005) 6415–24.
[15] J. Navarro, J. Fontcuberta, M. Izquierdo, J. Avila, M.C. Asensio; Curie‐temperature enhancement of electron‐doped Sr₂FeMoO₆ perovskites studied by photoemission spectroscopy; Phys. Rev. B 69 (2004) 115101.
[16] Y. Moritomo, Sh. Xu, T. Akimoto, A. Machida, N. Hamada, K. Ohoyama, E. Nishibori, M. Takata, M. Sakata; Electron doping effects in conducting Sr₂FeMoO₆; Phys. Rev. B 62 (2000) 14224.
[17] D. Rubi, C. Frontera, J. Nogués, J. Fontcuberta; Enhanced ferromagnetic interactions in electron doped Nd₂SrₓFeMoO₆ double perovskites; J. Phys.: Condens. Matter 16 (2004) 3173.
[18] C.L. Yuan, Y. Zhu, P.P. Ong; Enhancement of room‐temperature magnetoresistance in Sr₂FeMoO₆ by reducing its grain size and adjusting its tunnel‐barrier thickness; J. Appl. Phys. 91 (2002) 4421.