𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Application of the thermal boson expansion to the Heisenberg ferromagnets EuO and EuS

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

Publisher
Elsevier Science
Year
1988
Weight
745 KB
Volume
147
Category
Article
ISSN
0378-4363

No coin nor oath required. For personal study only.

✦ Synopsis

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 temperature dependent renormalization factor for spin waves and the reduced magnetization are calculated for a fcc lattice with S = 7/2, providing a reasonable agreement with the experimental data available on EuO and EuS.

📜 SIMILAR VOLUMES

Application of the thermal boson expansi
Application of the thermal boson expansion to the Heisenberg antiferromagnet MnF2
✍ M. Brajczewska; C. Fiolhais; J. Da Providência 📂 Article 📅 1989 🏛 Elsevier Science 🌐 English ⚖ 369 KB

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. Th