Theoretical Study on Coexistence of Ferromagnetism and Superconductivity

Details Theoretical Study on Coexistence of Ferromagnetism and Superconductivity Theoretical Study on Coexistence of Ferromagnetism and Superconductivity

2006-03-03

arxiv.org/abs/cond-mat/0603066v1

J. Phys. Soc. Jpn. 74 (2005) 527

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 10 figures

Scientific paper

10.1143/JPSJ.74.527

On the basis of a two-dimensional t-t' Hubbard model in ferromagnetic and paramagnetic states, the triplet superconducting mechanism is investigated by the third-order perturbation theory with respect to the on-site Coulomb interaction U. In general, the superconducting state is more stable in the paramagnetic state than in the ferromagnetic state. As a special case, the dominant ferromagnetic superconductivity is obtained by the electron-electron correlation between the electronlike majority and holelike minority bands. Furthermore, it is pointed out that in some cases the two bands play an essential role for the coexistence of superconductivity and ferromagnetism.

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