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Local dynamic spin-fluctuations in YCo2 compound

L. CHIONCEL1,2,* , E. BURZO3

Affiliation

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

Abstract

Density-functional studies of the electronic structure, of YCo2 compound are reported. The band structure near the Fermi energy shows rather heavy Co-d-derived bands. The resulting density of states is high, yielding a weak ferromagnetic instability via the Stoner mechanism. Many-body Hubbard-like correlation effects take place in the Co-d bands and they can be treated in the framework of Density Functional Theory (DFT) in combination with Dynamical Mean Filed Theory (DMFT) approximation. An interesting possibility is that the renormalized paramagnetic ground state may emerge, due to the combination of the weak competing ground states and quantum fluctuations..

Keywords

Co2, Magnetism, Electronic structure, Correlations, Spin fluctuation.

Submitted at: Dec. 2, 2005
Accepted at: May 18, 2006

Citation

L. CHIONCEL, E. BURZO, Local dynamic spin-fluctuations in YCo2 compound, Journal of Optoelectronics and Advanced Materials Vol. 8, Iss. 3, pp. 1105-1108 (2006)