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

• Tipo: Artigo em Revista Científica Internacional
• Data: 2020

Autores

Marcano, N (Autor) Outra; Algarabel, PA (Autor) Outra; Fernandez, JR (Autor) Outra; araujo, j. p. (Autor) FCUP; pereira, a. m. (Autor) FCUP; Belo, JH (Autor) FCUP; Magen, C (Autor) Outra; Morellon, L (Autor) Outra; Ibarra, MR (Autor) Outra

Revista

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Título: PHYSICAL REVIEW B

Vol. 102

ISSN: 2469-9950

Indexação

ISI Web of Knowledge - 3 Citações

Scopus - 3 Citações

Outras Informações

ID Authenticus: P-00T-1A1

DOI: 10.1103/physrevb.102.174416

Abstract (EN): We report a study of the effect of hydrostatic pressure (P) on the Griffiths-like phase in selected compounds of the R-5(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 chi(-1)(dc) 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, dT(G)/dP, has been determined. These results are compared with those obtained in Dy5Si3Ge in a previous work. The dT(G)/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 similar to 0.5 between the dT(G)/dP and the pressure coefficient of long-range magnetic ordering temperatures, dT(C,N)/dP (T-C, ferromagnetic; T-N, antiferromagnetic), is found in all the studied compounds.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 8