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Title:Unusual magnetodielectric effects in La2CuMnO6 induced by a dynamic crossover in dielectric relaxation at TC
Authors:ID Pezhumkattil Palakkal, Jasnamol, Materials Science and Technology Division, CSIR-National Institute for Interdisciplinary Science and Technology (CSIR-NIIST), Trivandrum, 695 019, India (Author)
ID Raj Sankar, Cheriyedath, Materials Science and Technology Division, CSIR-National Institute for Interdisciplinary Science and Technology (CSIR-NIIST), Trivandrum, 695 019, India (Author)
ID Parayancheri Paulose, Ajeesh, Materials Science and Technology Division, CSIR-National Institute for Interdisciplinary Science and Technology (CSIR-NIIST), Trivandrum, 695 019, India (Author)
ID Valant, Matjaž, UNG (Author)
ID Badasyan, Artem, UNG (Author)
ID Raama Varma, Manoj, Materials Science and Technology Division, CSIR-National Institute for Interdisciplinary Science and Technology (CSIR-NIIST), Trivandrum, 695 019, India (Author)
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Language:English
Work type:Not categorized
Typology:1.01 - Original Scientific Article
Organization:UNG - University of Nova Gorica
Abstract:A series of fixed frequency dielectric measurements shows dielectric relaxation in La2CuMnO6, with a dynamic (Arrhenius to Arrhenius) crossover at TC. The external magnetic field alters the relaxation parameters in the vicinity of crossover and induces an unusual trend in the magnetodielectric coupling around TC. A large magnetodielectric coupling of 55% (at 68 K, 4 kHz) and 61% (at 105 K, 285.8 kHz) under a small magnetic field of 5 kOe is discovered. Presence of ferromagnetic short-range correlations above TC and a sign reversal of magnetoresistance around TC are observed. Specific heat analysis revealed the presence of ferromagnetic, variable range hopping active charge localized state. The presence of ferromagnetic short-range correlations and the influence of a core-grain dominated magnetoresistance on the Maxwell-Wagner interfacial polarization are responsible for the observed large magnetodielectric effect. Both the magnetic ordering and external magnetic field control the electric dipole relaxation in the material.
Keywords:Double perovskite Griffiths-like phase Dielectric Magnetoresistance Magnetodielectric
Publication version:Version of Record
Year of publishing:2018
Number of pages:226-233
Numbering:2017, 100
PID:20.500.12556/RUNG-3507-06edd3fb-a186-6c85-664f-1aebccef5537 New window
COBISS.SI-ID:4979195 New window
DOI:10.1016/j.materresbull.2017.12.027 New window
NUK URN:URN:SI:UNG:REP:AF4I0BND
Publication date in RUNG:03.01.2018
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Record is a part of a journal

Title:Materials Research Bulletin
Publisher:Elsevier
Year of publishing:2018
ISSN:0025-5408

Document is financed by a project

Funder:ARRS - Slovenian Research Agency
Project number:BI-IND/15-17-002
Name:Dopiranje dvojnih perovskitov z elektronskimi vrzelmi za senzorske in spintronske aplikacije

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License:CC BY-NC-ND 4.0, Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
Link:http://creativecommons.org/licenses/by-nc-nd/4.0/
Description:The most restrictive Creative Commons license. This only allows people to download and share the work for no commercial gain and for no other purposes.
Licensing start date:03.01.2018

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