A-site disorder driven sharp field-induced transition and collapse of charge ordering in Sm1/2Ca1/2-xSrxMnO3


Our study on Sm1/2Ca1/2-xSrxMnO3 (x = 0, 1/6, 1/3, and 1/2) system shows an unusual consequence in magnetic field-induced transition to ferromagnetic metallic state and collapse of charge ordering in the intermediate compositions. Interestingly, the transition is sharp or step-like at low temperature that is observed at much lower field (similar to 75 kOe) for intermediate compositions than the end compositions (not visible up to 100 kOe). The atomic-scale local inhomogeneity/distortion arising from ionic mismatch due to doping is supposed to be critical behind this field-induced transition. The charge ordering temperature observed from magnetization and magnetoresistance studies decreases with increasing x which is consistent with the results for R-1/(2)A(1/2)MnO(3) (R = La - Sm, A = Ca, Sr) family. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4755802]



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Sabyasachi, S; Karmakar, A; Majumdar, S; Giri, S; Das, S; Amaral, VS

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S.G. wishes to thank CSIR, India (Project No. 03(1167)/10/EMR-II) for the financial support and Unit of Nanoscience of IACS funded by DST, India for providing MPMS facility. S.S. also wishes to thank CSIR, India for the JRF. S.D acknowledges Foundation of Science and Technology (FCT) of Portugal for the postdoctoral grant.

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