Application of the thermal boson expansi
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C. Fiolhais; M. Brajczewska; J. da ProvidΓͺncia
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Article
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1988
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Elsevier Science
β 745 KB
The method of thermal boson expansion [1] is extended to the Heisenberg model with spins S/> 1 and applied to the ferromagnetic insulators EuO and EuS. Taking in the momentum space an adequate cut-off, which is almost independent of the spin, a good guess of the critical temperature is made. The te