Analysis of the magnetic behaviour of Ce1-xGdxCo2 compounds

• Type: Article in International Scientific Journal
• Date: 1998

Authors

Teresa Seixas (Author) FCUP; Machado da Silva, JMM (Author) FCUP

Journal

Title: Physica B: Condensed Matter

Vol. 252

Pages: 1-14

ISSN: 0921-4526

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 0 Citations

Scopus - 0 Citations

Other information

Authenticus ID: P-001-7M9

DOI: 10.1016/s0921-4526(98)00052-0

Abstract (EN): Experimental data on the spontaneous magnetization m(s)(T) of Ce1-xGdxCo2 compounds were analysed using a mean-field phenomenological model which takes into account the exchange interactions between atoms of the three magnetic species (Gd, Ce, Co) as well as the crystal electric field interaction on the Ce ions, This model allowed us to obtain, through a numerical fitting procedure to the m(s)(T) curves, the composition dependence of the Gd-Co and Go-Co exchange interaction strengths (A(Gd-Co) and A(Co-Co), respectively) and of the Co magnetic moment m(Co). Both A(Gd-Co) and A(Co-Co) increase considerably with the Ce content, while m(Co) decreases linearly from x = 1 down to the composition x = 0.15; below the latter value of x, the magnetic ordering is suppressed. The intermediate valence of Ce, as suggested by the composition dependence of the room temperature lattice parameter, being also compatible with the obtained thermal variation of the Ce contribution to the total magnetic moment, is expected to play an important role in the enhancement of the A(Gd-Co) and A(Co-Co) interaction strengths, through a net reinforcement of the 3d-5d hybridization.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 14