Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2003-04-28
Physics
Condensed Matter
Strongly Correlated Electrons
4 pages,5 figures,submitted to J.Phys.Soc.Jpn
Scientific paper
10.1143/JPSJ.72.1847
The multi-orbital Hubbard model in one dimension is studied using the numerical diagonalization method. Due to the effect of the crystal-field splitting $\Delta$, the fully polarized ferromagnetism which is observed in the strong coupling regime becomes unstable against the partially polarized ferromagnetism when the 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 the Hund's rule coupling and the crystal-field splitting. The superconducting phase with the Luttinger liquid parameter $K_{\rho}>1$ is observed for the singlet ground state in this region.
Ono Yoshiaki
Sano Kazuhiro
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