Magnetic order and magnetoelectric properties of R2CoMn O6 perovskites (R=Ho, Tm, Yb, and Lu)
Blasco, J. (Universidad de Zaragoza) ; García-Muñoz, J.L. ; García, J. ; Subías, G. (Universidad de Zaragoza) ; Stankiewicz, J. (Universidad de Zaragoza) ; Rodríguez-Velamazán, J.A. ; Ritter, C.
Resumen: We present a detailed study on the magnetic structure and magnetoelectric properties of several double perovskites R2CoMnO6 (R=Ho, Tm, Yb, and Lu). All of these samples show an almost perfect (~94%) ordering of Co2+ and Mn4+ cations in the unit cell. Our research reveals that the magnetic ground state strongly depends on the R size. For samples with larger R (Ho and Tm), the ground state is formed by a ferromagnetic order (F type) of Co2+ and Mn4+ moments, while R either remains mainly disordered (Ho) or is coupled antiferromagnetically (Tm) to the Co/Mn sublattice. For samples with smaller R (Yb or Lu), competitive interactions lead to the formation of an E-type arrangement for the Co2+ and Mn4+ moments with a large amount of extended defects such as stacking faults. The Yb3+ is partly ordered at very low temperature. The latter samples undergo a metamagnetic transition from the E into the F type, which is coupled to a negative magnetodielectric effect. Actually, the real part of dielectric permittivity shows an anomaly at the magnetic transition for the samples exhibiting an E-type order. This anomaly is absent in samples with F-type order, and, accordingly, it vanishes coupled to the metamagnetic transition for R=Yb or Lu samples. At room temperature, the huge values of the dielectric constant reveal the presence of Maxwell-Wagner depletion layers. Pyroelectric measurements reveal a high polarization at low temperature, but the onset of pyroelectric current is neither correlated to the kind of magnetic ordering nor to the magnetic transition. Our study identified the pyroelectric current as thermally stimulated depolarization current and electric-field polarization curves show a linear behavior at low temperature. Therefore, no clear ferroelectric transition occurs in these compounds.
Idioma: Inglés
DOI: 10.1103/PhysRevB.96.024409
Año: 2017
Publicado en: Physical Review B 96, 2 (2017), 024409 [14 pp]
ISSN: 2469-9950
Factor impacto JCR: 3.813 (2017)
Categ. JCR: PHYSICS, CONDENSED MATTER rank: 18 / 67 = 0.269 (2017) - Q2 - T1
Financiación: info:eu-repo/grantAgreement/ES/DGA/E69-CAMRADS
Financiación: info:eu-repo/grantAgreement/ES/MINECO/MAT2015-68760-C2-1
Financiación: info:eu-repo/grantAgreement/ES/MINECO/MAT2015-68760-C2-2
Tipo y forma: Article (Published version)
Área (Departamento): Área Física Materia Condensada (Dpto. Física Materia Condensa.)
You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use. You may not use the material for commercial purposes.
Exportado de SIDERAL (2018-07-23-11:30:40)
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Idioma: Inglés
DOI: 10.1103/PhysRevB.96.024409
Año: 2017
Publicado en: Physical Review B 96, 2 (2017), 024409 [14 pp]
ISSN: 2469-9950
Factor impacto JCR: 3.813 (2017)
Categ. JCR: PHYSICS, CONDENSED MATTER rank: 18 / 67 = 0.269 (2017) - Q2 - T1
Financiación: info:eu-repo/grantAgreement/ES/DGA/E69-CAMRADS
Financiación: info:eu-repo/grantAgreement/ES/MINECO/MAT2015-68760-C2-1
Financiación: info:eu-repo/grantAgreement/ES/MINECO/MAT2015-68760-C2-2
Tipo y forma: Article (Published version)
Área (Departamento): Área Física Materia Condensada (Dpto. Física Materia Condensa.)
You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use. You may not use the material for commercial purposes. Exportado de SIDERAL (2018-07-23-11:30:40)
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Record created 2017-11-16, last modified 2018-07-23