- Tytuł:
- Spin Chain in Magnetic Field: Limitations of the Large-N Mean-Field Theory
- Autorzy:
-
Wohlfeld, K.
Chen, Cheng-Chien
van Veenendaal, M.
Devereaux, T. - Powiązania:
- https://bibliotekanauki.pl/articles/1384813.pdf
- Data publikacji:
- 2015-02
- Wydawca:
- Polska Akademia Nauk. Instytut Fizyki PAN
- Tematy:
-
71.10.Fd
75.10.Jm
75.10.Pq - Opis:
- Motivated by the recent success in describing the spin and orbital spectrum of a spin-orbital chain using a large-N mean-field approximation, we apply the same formalism to the case of a spin chain in the external magnetic field. It occurs that in this case, which corresponds to N=2 in the approximation, the large-N mean-field theory cannot qualitatively reproduce the spin excitation spectra at high magnetic fields, which polarize more than 50% of the spins in the magnetic ground state. This, rather counterintuitively, shows that the physics of a spin chain can under some circumstances be regarded as more complex than the physics of a spin-orbital chain.
- Źródło:
-
Acta Physica Polonica A; 2015, 127, 2; 201-203
0587-4246
1898-794X - Pojawia się w:
- Acta Physica Polonica A
- Dostawca treści:
- Biblioteka Nauki
Artykuł