Pressure dependence of the Griffiths-like phase in 5:4 intermetallics

Marcano, N. (Universidad de Zaragoza) ; Algarabel, P.A. (Universidad de Zaragoza) ; Fernández, J.R. ; 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: We report a study of the effect of hydrostatic pressure (P) on the Griffiths-like phase in selected compounds of the R5(SixGe1-x)4 family of alloys (Tb4.925La0.075Si2Ge2 and Gd5Ge4) which present either the Gd5Si2Ge2-type (monoclinic, M) or the Sm5Ge4-type [orthorhombic-II, O(II)] structural phases at room temperature. The downward deviation in the inverse low-field dc susceptibility ¿dc-1 from the Curie-Weiss law below a characteristic temperature TG indicates that the Griffiths-like phase exists at pressures up to 10 kbar. From the obtained T-P phase diagrams, the pressure coefficient of the Griffiths-like temperature, dTG/dP, has been determined. These results are compared with those obtained in Dy5Si3Ge in a previous work. The dTG/dP coefficient is strongly dependent on the nature (first or second order) of the long-range order (FM or AFM) transition. This effect can be ascribed to a different structural character of the clusters within the Griffiths phase. A ratio of ~0.5 between the dTG/dP and the pressure coefficient of long-range magnetic ordering temperatures, dTC, N/dP (TC, ferromagnetic; TN, antiferromagnetic), is found in all the studied compounds.

Idioma: Inglés

DOI: 10.1103/PhysRevB.102.174416

Año: 2020

Publicado en: PHYSICAL REVIEW B 102, 17 (2020), 174416 [8 pp]
ISSN: 2469-9950

Factor impacto JCR: 4.036 (2020)

Categ. JCR: MATERIALS SCIENCE, MULTIDISCIPLINARY rank: 130 / 333 = 0.39 (2020) - Q2 - T2
Categ. JCR: PHYSICS, CONDENSED MATTER rank: 22 / 69 = 0.319 (2020) - Q2 - T1
Categ. JCR: PHYSICS, APPLIED rank: 41 / 160 = 0.256 (2020) - Q2 - T1

Factor impacto SCIMAGO: 1.78 - Electronic, Optical and Magnetic Materials (Q1) - Condensed Matter Physics (Q1)

Financiación: info:eu-repo/grantAgreement/ES/DGA/E28-20R
Financiación: info:eu-repo/grantAgreement/ES/MCIU/MAT2017-82970-C2-2-R

Tipo y forma: Artículo (Versión definitiva)

Área (Departamento): Área Física Materia Condensada (Dpto. Física Materia Condensa.)