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

Abstract: 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 ??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 ?0.5 between the dT G/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.

Otras publicaciones de la misma revista o congreso con autores/as de la Universidad de Cantabria

 Fuente: Phys. Rev. B 102, 174416

Editorial: American Physical Society

 Año de publicación: 2020

Nº de páginas: 8

Tipo de publicación: Artículo de Revista

DOI: 10.1103/PhysRevB.102.174416

ISSN: 1098-0121,1550-235X,2469-9950,2469-9969

Proyecto español: MAT2017-82970-C2-2-R ; MAT2017-83631-C3-R

Autores/as

MARCANO, N.

ALGARABEL, P. A.

PEREIRA, A. M.

BELO, J. H.

MAGÉN, C.

MORELLÓN, L.

IBARRA, M. R.