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Spin fluctuations in cobalt and nickel-rare-earth (yttrium) exchange enhanced paramagnets

E. BURZO1,* , L. CHIONCEL2

Affiliation

  1. Faculty of Physics Babes-Bolyai University, Str. M. Kogalniceanu, 400084 Cluj-Napoca, Romania
  2. Institute for Theoretical Physics and Computational Physics, Graz University of Technology, A-8010 Graz, Austria and Department of Physics, University of Oradea,410087 Oradea, Romania

Abstract

The temperature dependences of the magnetic susceptibilities of cobalt and nickel-rare-earth (yttrium) exchange enhanced paramagnets were analyzed. As the temperature increases there is a change from a T2 dependence, to a Curie-Weiss behavior. The experimental data were analyzed in spin fluctuations model by using a classical Gaussian statistics. The quenching of spin fluctuation by internal fields, when nonmagnetic rare-earth (yttrium) is replaced by a magnetic one, was discussed. The decrease of the effective cobalt and nickel moments is linearly dependent on the exchange field..

Keywords

Paramagnetism, Spin fluctuations, Rare-earth compounds, Band structure.

Submitted at: April 1, 2008
Accepted at: July 1, 2008

Citation

E. BURZO, L. CHIONCEL, Spin fluctuations in cobalt and nickel-rare-earth (yttrium) exchange enhanced paramagnets, Journal of Optoelectronics and Advanced Materials Vol. 10, Iss. 7, pp. 1639-1644 (2008)