Pair-Hopping Mechanism for Layered Superconductors

Abstract

We propose a possible charge fluctuation effect expected in layered superconducting materials. In the multireference density functional theory, relevant fluctuation channels for the Josephson coupling between superconducting layers include the interlayer pair hopping derived from the Coulomb repulsion. When interlayer single-electron tunneling processes are irrelevant in the Kohn-Sham electronic band structure calculation, the two-body effective interactions stabilize a superconducting phase. This state is also regarded as a valence-bond solid in a bulk electronic state. The hidden order parameters coexist with the superconducting order parameter when the charging effect of a layer is comparable to the pair hopping. Relevant materials structures favorable for the pair-hopping mechanism are discussed.

24 pages, 2 figures, to be published in J. Phys. Soc. Jpn. (2009)

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Cited by in corpus (6)

• Superconductivity assisted by inter-layer pair hopping in multi-layered cuprates
• Superconductivity in bilayer $t$-$t^{\prime }$ Hubbard models
• Superconductivity arising from layer-differentiation in multi-layer cuprates
• Self-doping effect arising from electron correlations in multi-layer cuprates
• Pairing susceptibility in the weakly interacting multilayer Hubbard model evaluated by direct perturbative expansion
• Theorems on ground-state phase transitions in Kohn-Sham models given by the Coulomb density functional