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Application of the thermal boson expansion to the Heisenberg antiferromagnet MnF2

✍ Scribed by M. Brajczewska; C. Fiolhais; J. Da Providência

Publisher
Elsevier Science
Year
1989
Tongue
English
Weight
369 KB
Volume
160
Category
Article
ISSN
0921-4526

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✦ Synopsis

We apply the thermal boson expansion which has been presented in refs. [1][2][3] to the Heisenberg isotropic antiferromagnet, submitted to an external field. Considering only spin waves with wave vectors up to a certain cut-off, the magnetization and the principal susceptibilities are calculated. The results are compared with the experimental data on MnF 2.

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Application of the thermal boson expansi
Application of the thermal boson expansion to the Heisenberg ferromagnets EuO and EuS
✍ C. Fiolhais; M. Brajczewska; J. da Providência 📂 Article 📅 1988 🏛 Elsevier Science ⚖ 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