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Title: Field induced phase transition in Sm{sub 0.5}(Ca{sub 1−x}Sr{sub x}){sub 0.5}MnO{sub 3}

We demonstrate a fascinating consequence of A-site disorder at x = 0.5 in a new series Sm{sub 0.5}(Ca{sub 1−x}Sr{sub x}){sub 0.5}MnO{sub 3}. An unusual magnetic field-induced ultra-sharp transition to ferromagnetic metallic (FMM) state and collapse of charge ordering are observed both in magnetization and magnetoresistance curves at much lower field compared to end compounds. When magnetic field is applied above a critical field, FMM state appears and it retains the high-field state, although magnetic field decreases to zero. With decreasing field sweep rate the transition shifts to higher field indicating a meta-magnetic transition. The atomic-scale local inhomogeneity/distortion arising from the difference in ionic radii and/or the random Coulomb potential from ion mixture is supposed to be critical behind such striking phenomena.
Authors:
; ;  [1]
  1. Dept. of Solid State Physics, Indian Association for the Cultivation of Science, Kolkata - 700032 (India)
Publication Date:
OSTI Identifier:
22269357
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1591; Journal Issue: 1; Conference: 58. DAE solid state physics symposium 2013, Patiala, Punjab (India), 17-21 Dec 2013; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; COULOMB FIELD; CRITICAL FIELD; MAGNETIZATION; MAGNETORESISTANCE; MIXTURES; PHASE TRANSFORMATIONS