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Title: Evaluation of the intrinsic magneto-dielectric coupling in LaMn{sub 0.5}Co{sub 0.5}O{sub 3} single crystals

The magneto-dielectric coupling in (l00) oriented LaMn{sub 0.5}Co{sub 0.5}O{sub 3} single crystals has been investigated using temperature, frequency, and magnetic field dependent dielectric response. Electronic transport data divulges that polaronic hopping arises due to Emin-Holstein adiabatic small polarons. Spin realignment through external magnetic field favors faster polaronic hopping by lowering activation energy for dielectric relaxation. Finally, positive magneto-dielectricity and magnetoloss under increasing magnetic field at high frequency of the exciting ac field confirms intrinsic magneto-dielectric effect in disordered ferromagnetic-insulator LaMn{sub 0.5}Co{sub 0.5}O{sub 3}. This study also emphasizes the need to use single crystals as well as the frequencies higher than the corresponding inverse relaxation time.
Authors:
; ;  [1] ;  [1] ;  [2]
  1. Department of Physics, Indian Institute of Science, Bangalore 560012 (India)
  2. (India)
Publication Date:
OSTI Identifier:
22300181
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 104; Journal Issue: 20; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ACTIVATION ENERGY; COBALT COMPOUNDS; COUPLING; DIELECTRIC MATERIALS; FREQUENCY DEPENDENCE; LANTHANUM COMPOUNDS; MAGNETIC FIELDS; MAGNETORESISTANCE; MANGANESE COMPOUNDS; MONOCRYSTALS; OXYGEN COMPOUNDS; POLARONS; RELAXATION TIME; SPIN; TEMPERATURE DEPENDENCE