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Journal of Magnetism and Magnetic Materials

Ferromagnetism and superconductivity in the one-dimensional multi-orbital Hubbard model

Kazuhiro Sano, Yoshiaki Ōno

Published Nov 4, 2006• 3 citations
Publisher
DOI
10.1016/j.jmmm.2006.10.267

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Using the numerical diagonalization method, we investigate the ferromagnetism and the superconductivity in the multi-orbital Hubbard model in one-dimension. To examine the superconductivity, we calculate the critical exponent Kρ based on the Luttinger liquid theory and the anomalous flux quantization in the superconducting region. Analyzing the value of Kρ, we obtain the phase diagram on the U′ - J parameter plane including the superconducting phase and the fully polarized ferromagnetic phase.