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

Journal Article · Thu Apr 24 04:00:00 EDT 2014 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.4873025· OSTI ID:22269357

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.

• OSTI ID: 22269357
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 1591; ISSN APCPCS; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
COULOMB FIELD
CRITICAL FIELD
MAGNETIZATION
MAGNETORESISTANCE
MIXTURES
PHASE TRANSFORMATIONS