EFFECTIVE FIELD THEORY APPROACH TO FERROMAGNETS AND ANTIFERROMAGNETS IN CRYSTALLINE SOLIDS
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- JOSÉ MARÍA ROMÁN
- Departament d'Estructura i Constituents de la Matèria, Universitat de Barcelona, Diagonal, 647 E-08028 Barcelona, Catalonia, Spain
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- JOAN SOTO
- Departament d'Estructura i Constituents de la Matèria, Universitat de Barcelona, Diagonal, 647 E-08028 Barcelona, Catalonia, Spain
書誌事項
- 公開日
- 1999-03-20
- DOI
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- 10.1142/s0217979299000655
- 公開者
- World Scientific Pub Co Pte Lt
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説明
<jats:p> We present a systematic construction of effective Lagrangians for the low energy and momentum region of ferromagnetic and antiferromagnetic spin waves in crystalline solids. We fully exploit the spontaneous symmetry breaking pattern SU(2)→U(1), the fact that spin waves are its associated Goldstone modes, the crystallographic space group and time reversal symmetries. We show how to include explicit SU(2) breaking terms due to spin-orbit and magnetic dipole interactions. The coupling to electromagnetic fields is also discussed in detail. For definiteness we work with the space group [Formula: see text] and present our results to next to leading order. </jats:p>
収録刊行物
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- International Journal of Modern Physics B
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International Journal of Modern Physics B 13 (07), 755-789, 1999-03-20
World Scientific Pub Co Pte Lt
