Spin Fluctuations and Itinerant Magnetism in
✍ Scribed by F. Morales; R. Escudero; A. Durán
- Publisher
- Springer US
- Year
- 2008
- Tongue
- English
- Weight
- 414 KB
- Volume
- 153
- Category
- Article
- ISSN
- 0022-2291
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## Abstract The in‐plane ferromagnetic (FM) fluctuations and three‐dimensional (3D) itinerant magnetism on the 3D triangular lattice of Na~__x__~CoO~2~ are studied based on a single‐band Hubbard model using the Kotliar–Ruckenstein (KR) slave‐boson mean‐field (SBMF) technique. By analyzing the insta
Using a generalized random phase approach quantum fluctuations beyond the helical mean-field states of the Hubbard model off half filling are discussed. The collective mode spectrum is shown to exhibit spin-charge mixing and is found to be strongly renormalized by coupling to low-energy incoherent p