A-site disorder driven sharp field-induced transition and collapse of charge ordering in Sm1/2Ca1/2-xSrxMnO3
authors Sabyasachi, S; Karmakar, A; Majumdar, S; Giri, S; Das, S; Amaral, VS
nationality International
journal JOURNAL OF APPLIED PHYSICS
keywords PHASE-TRANSITIONS; MANGANITES; PEROVSKITES; TRANSPORT
abstract 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]
publisher AMER INST PHYSICS
issn 0021-8979
year published 2012
volume 112
issue 7
digital object identifier (doi) 10.1063/1.4755802
web of science category Physics, Applied
subject category Physics
unique article identifier WOS:000310489400074
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