Microscopic Derivation of Ginzburg--Landau Equations for Coexistent States of Superconductivity and Magnetism
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概要
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Ginzburg--Landau (GL) equations for the coexistent states of superconductivity and magnetism are derived microscopically from the extended Hubbard model with on-site repulsive and nearest-neighbor attractive interactions. In the derived GL free energy a cubic term that couples the spin-singlet and spin-triplet components of superconducting order parameters (SCOP) with magnetization exists. This term gives rise to a spin-triplet SCOP near the interface between a spin-singlet superconductor and a ferromagnet, consistent with previous theoretical studies based on the Bogoliubov--de Gennes method and the quasiclassical Green's function theory. In coexistent states of singlet superconductivity and antiferromagnetism it leads to the occurrence of \pi-triplet SCOPs.
- 2012-06-15
著者
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Yano Keiji
Department Of Agricultural Chemistry Faculty Of Agriculture The University Of Tokyo
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Kuboki Kazuhiro
Department Of Physics Kobe University
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Yano Keiji
Department of Physics, Kobe University, Kobe 657-8501, Japan
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