78858 20200707115303.0 doi 10.1103/PhysRevB.99.054419 sideral 111231 ART-2019-111231 eng (orcid)0000-0002-5331-9758 Marcano, N. Universidad de Zaragoza Cluster-glass dynamics of the Griffiths phase in Tb5-xLaxSi2Ge2 2019 Access copy available to the general public Unrestricted 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. info:eu-repo/grantAgreement/ES/DGA/E26 info:eu-repo/grantAgreement/ES/MCIU/MAT2017-83631-C3-R info:eu-repo/grantAgreement/ES/MINECO/MAT2017-82970-C2-2-R info:eu-repo/semantics/openAccess by-nc http://creativecommons.org/licenses/by-nc/3.0/es/ 1.811 2019 Electronic, Optical and Magnetic Materials 2019 Q1 Condensed Matter Physics 2019 Q1 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion (orcid)0000-0002-4698-3378 Algarabel, P.A. Universidad de Zaragoza Barquín, L.F. Araujo, J.P. Pereira, A.M. Belo, J.H. (orcid)0000-0002-6761-6171 Magén, C. Universidad de Zaragoza (orcid)0000-0003-3724-508X Morellón, L. Universidad de Zaragoza (orcid)0000-0003-0681-8260 Ibarra, M.R. Universidad de Zaragoza 2003 395 Universidad de Zaragoza Dpto. Física Materia Condensa. Área Física Materia Condensada 99, 5 (2019), 054419 [10 pp] Phys. Rev. B PHYSICAL REVIEW B 2469-9950 1175961 http://zaguan.unizar.es/record/78858/files/texto_completo.pdf Versión publicada 30391 http://zaguan.unizar.es/record/78858/files/texto_completo.jpg?subformat=icon icon Versión publicada oai:zaguan.unizar.es:78858 articulos driver 2020-07-07-11:49:53 ARTICLE