Correlation effect in bcc iron at finite temperatures

Self-consistent second-order perturbation theory is applied to a multi-band Hubbard model to study the static and the dynamical properties of iron at finite temperatures. Reasonable values of the Curie temperature and the Curie constant are obtained for a realistic band structure and realistic value...

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Bibliographic Details
Published in:Journal of the Korean Physical Society 2013, 62(12), , pp.2160-2163
Main Authors: Nishishita, Muneyuki, Hirashima, Dai, Pandey, Sudhakar
Format: Article
Language:English
Subjects:
Mathematical and Computational Physics
Particle and Nuclear Physics
Physics
Physics and Astronomy
Theoretical
물리학
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Summary:Self-consistent second-order perturbation theory is applied to a multi-band Hubbard model to study the static and the dynamical properties of iron at finite temperatures. Reasonable values of the Curie temperature and the Curie constant are obtained for a realistic band structure and realistic values of the local Coulomb interaction. The dynamical transverse susceptibility in the ferromagnetic phase is calculated, and a spin wave mode vanishing in the long-wavelength limit is correctly obtained. The spin stiffness constant is found to be enhanced compared with that obtained using the random phase approximation.
ISSN:0374-4884
1976-8524
DOI:10.3938/jkps.62.2160