Cluster-glass dynamics of the Griffiths phase in Tb5-xLaxSi2Ge2
Marcano, N. (Universidad de Zaragoza) ; Algarabel, P.A. (Universidad de Zaragoza) ; Barquín, L.F. ; Araujo, J.P. ; Pereira, A.M. ; Belo, J.H. ; Magén, C. (Universidad de Zaragoza) ; Morellón, L. (Universidad de Zaragoza) ; Ibarra, M.R. (Universidad de Zaragoza)
Resumen: The static magnetization and dynamic susceptibility responses of the cluster system within a Griffiths phase of the magnetocaloric compound Tb5-xLaxSi2Ge2 (x=0.075) have been investigated. A novel cluster-glass state within the Griffiths phase is formed at a characteristic freezing temperature where short-range ferromagnetic correlations set in the paramagnetic regime. Ferromagneticlike correlations are built up at around 155 K, which suddenly become frozen at a lower temperature ~140K, thus in analogy with a reentrant spin glass behavior. The ac susceptibility near the freezing temperature follows a critical slowing down process characterized by t0=10-13s and dynamic exponents z¿~6 and ß~0.4, similar to well-known spin glass systems. The nonlinear ac susceptibility analysis shows clearly the existence of a transition associated to the reentrant behavior. The origin of the intermediate cluster-glass phase inside the Griffiths phase is proposed to be the result of a combination of short-ranged RKKY intralayer positive exchange interactions between rare-earth Tb3+ ions and antiferromagnetic exchange between adjacent interlayers involving Si and Ge atoms in connection to the Tb3+ atoms.
Idioma: Inglés
DOI: 10.1103/PhysRevB.99.054419
Año: 2019
Publicado en: PHYSICAL REVIEW B 99, 5 (2019), 054419 [10 pp]
ISSN: 2469-9950
Factor impacto SCIMAGO: 1.811 - Electronic, Optical and Magnetic Materials (Q1) - Condensed Matter Physics (Q1)
Financiación: info:eu-repo/grantAgreement/ES/DGA/E26
Financiación: info:eu-repo/grantAgreement/ES/MCIU/MAT2017-83631-C3-R
Financiación: info:eu-repo/grantAgreement/ES/MINECO/MAT2017-82970-C2-2-R
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.
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Idioma: Inglés
DOI: 10.1103/PhysRevB.99.054419
Año: 2019
Publicado en: PHYSICAL REVIEW B 99, 5 (2019), 054419 [10 pp]
ISSN: 2469-9950
Factor impacto SCIMAGO: 1.811 - Electronic, Optical and Magnetic Materials (Q1) - Condensed Matter Physics (Q1)
Financiación: info:eu-repo/grantAgreement/ES/DGA/E26
Financiación: info:eu-repo/grantAgreement/ES/MCIU/MAT2017-83631-C3-R
Financiación: info:eu-repo/grantAgreement/ES/MINECO/MAT2017-82970-C2-2-R
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 (2020-07-07-11:49:53)
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Record created 2019-04-12, last modified 2020-07-07