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Band structure and magnetic properties of RNi4B compounds with R=Gd, Tb, Dy, Ho and Er

P. VLAIC1, N. BUCUR1, C. LAZAR1, E. BURZO1,*

Affiliation

  1. Faculty of Physics, Babes-Bolyai University, 400084 Cluj-Napoca, Romania

Abstract

The RNi4B compounds (R=Gd, Tb, Dy, Ho and Er) crystalize in a hexagonal type structure having P6/mmm space group. Band structure calculations show that smal magnetic moments are induced on the Ni(2c) and Ni(3g) atoms. The R(5d) band polarizations are linearly dependent on the De Gennes factor. The contribution from local 4f-5d and short range 5d-3d exchange interactions to R(5d) band polarization were determined. The Curie temperatures are linearly dependent on the De Gennes factor. Above Curie temperatures, the magnetic susceptibilities follow a Curie-Weiss behavior. The effective nickel moments are ≅1.8 µB/atom. The magnetic behavior of nickel is analyzed in the spin fluctuation model..

Keywords

Rare earth compounds, Magnetic measurements, Band structure, Spin fluctuations.

Submitted at: Jan. 18, 2006
Accepted at: March 23, 2006

Citation

P. VLAIC, N. BUCUR, C. LAZAR, E. BURZO, Band structure and magnetic properties of RNi4B compounds with R=Gd, Tb, Dy, Ho and Er, Journal of Optoelectronics and Advanced Materials Vol. 8, Iss. 2, pp. 490-493 (2006)