Spin Disorder Resistivity and Electronic Specific Heat of Gd-4(Co1-xCux)(3) Compounds

• Type: Article in International Conference Proceedings Book
• Date: 2008

Authors

Teresa Seixas (Author) FCUP; M. A. Salgueiro da Silva (Author) FCUP; de Lima, OF (Author) Other; Lopez, J (Author) Other; Braun, HF (Author) Other; Eska, G (Author) Other

Conference proceedings International

Title: ADVANCED MATERIALS FORUM IV

Pages: 333-337

13th Conference of the Sociedade-Portuguesa-de-Materiais/4th International Materials Symposium

Oporto, PORTUGAL, APR 01-04, 2007

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Authenticus ID: P-004-27W

Abstract (EN): In this work, we present a study of the spin disorder resistivity (rho(m infinity)) and the electronic specific heat coefficient (gamma) in Gd-4(Co1-xCux)(3) compounds, with x = 0, 0.05, 0.10, 0.20, 0.30. The experimental results show a strongly non-linear dependence of rho(m infinity) on the de Gennes factor which, in similar intermetallic compounds. is usually attributed to the existence of spin fluctuations on the Co 3d bands and its amplification by the thermal disorder of the Gd magnetic moments through the Gd-Co exchange coupling. Using a novel combined analysis of rho(m infinity) and gamma, we show, however, that only, electron band structure changes are involved in the anomalous behaviour of rho(m infinity) and that a linear dependence of rho(m infinity) on the de Gennes factor is obtained when the variation of the effective mass is properly taken into account.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 5