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

• Type: Article in International Scientific Journal
• Date: 2020

Authors

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

Journal

The Journal is awaiting validation by the Administrative Services.

Title: PHYSICAL REVIEW B

Vol. 102

ISSN: 2469-9950

Indexing

ISI Web of Knowledge - 3 Citations

Scopus - 3 Citations

Other information

Authenticus ID: 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.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 8