Aug, 2003
Ferromagnetism and superconductivity in the multi-orbital Hubbard model: Hund's rule coupling versus crystal-field splitting
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
- ,
- Volume
- 72
- Number
- 8
- First page
- 1847
- Last page
- 1850
- Language
- English
- Publishing type
- Research paper (scientific journal)
- DOI
- 10.1143/JPSJ.72.1847
- Publisher
- PHYSICAL SOC JAPAN
The multi-orbital Hubbard model in one dimension is studied using the numerical diagonalization method. Due to them effect of crystal-field splitting Delta, 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 Delta. 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-rho > 1 is observed for the singlet ground state in this region.
- Link information
- ID information
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- DOI : 10.1143/JPSJ.72.1847
- ISSN : 0031-9015
- Web of Science ID : WOS:000184996000008