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Ferromagnetism and Superconductivity in the Multi-orbital Hubbard Model : Hund's Rule Coupling versus Crystal-Field Splitting
Ferromagnetism and Superconductivity in the Multi-orbital Hubbard Model : Hund's Rule Coupling versus Crystal-Field Splitting
Sano, Kazuhiro
Ono, Yoshiaki
The Physical Society of Japan
electronic structure
ferromagnetism
superconductivity
Luttinger liquid
Hubbard model
The multi-orbital Hubbard model in one dimension is studied using the numerical diagonalization method. Due to the effect of crystal-field splitting △, the fully polarized ferromagnetism, which is observed in the strong coupling regime, becomes unstable against the partially polarized ferromagnetism when Hund's rule coupling J is smaller than a certain critical value of order of △. In the vicinity of the partially polarized ferromagnetism, the orbital fluctuation develops due to the competition between Hund's rule coupling and crystal-field splitting. The superconducting phase with the Luttinger liquid parameter K_ρ> 1 is observed for the singlet ground state in this region..
The Physical Society of Japan
2003-08
eng
journal article
http://hdl.handle.net/10191/1153
https://niigata-u.repo.nii.ac.jp/records/2131
info:doi/10.1143/JPSJ.72.1847
AA00704814
00319015
Journal of the Physical Society of Japan
Journal of the Physical Society of Japan
72
1847
1850
https://niigata-u.repo.nii.ac.jp/record/2131/files/19_0001.pdf
application/pdf
275.1 kB
2019-07-29