Theoretical Study on Coexistence of Ferromagnetism and Superconductivity(Condensed Matter : Electronic Structure, Electrical, Magnetic and Optical Properties)
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概要
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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 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.
- 一般社団法人日本物理学会の論文
- 2005-02-15
著者
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Yamada Kosaku
Department Of Mechanical Engineering Faculty Of Engineering Kagoshima University
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Kaneyasu Hirono
Department Of Material Science University Of Hyogo
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