Journal ArticleDOI
Mechanism for high-temperature superconductivity.
V. J. Emery,George Reiter +1 more
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TLDR
An explanation of the mechanism for high-temperature superconductivity is given, based upon a strong-coupling analysis of the extended Hubbard model, which shows nonretarded attractive interactions whose strength increases as the oxygen-copper Coulomb repulsion increases and can be strong enough, for realistic parameters, to overcome the direct oxygen-oxygen CoulombRepulsion.Abstract:
An explanation of the mechanism for high-temperature superconductivity is given, based upon a strong-coupling analysis of the extended Hubbard model previously introduced by one of us. The basic carriers are oxygen-hole quasiparticles in p\ensuremath{\sigma} orbitals, whose spin is strongly correlated with that of adjacent copper holes. These quasiparticles interact through the enhanced superexchange of the associated spins on the Cu sites, and an enhanced zero-point motion of the surrounding Cu holes. These are nonretarded attractive interactions whose strength increases as the oxygen-copper Coulomb repulsion increases and can be strong enough, for realistic parameters, to overcome the direct oxygen-oxygen Coulomb repulsion. The superconducting transition temperature that results is proportional to the Fermi energy of the oxygen holes.read more
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Journal ArticleDOI
Quantum cluster theories
TL;DR: The quantum cluster theory as discussed by the authors is a set of approximations for infinite lattice models which treat correlations within the cluster explicitly, and correlations at longer length scales either perturbatively or within a mean-field approximation.
Journal ArticleDOI
The t–J model for the oxide high-Tc superconductors
Masao Ogata,Hidetoshi Fukuyama +1 more
TL;DR: In this article, a theoretical review is given on high temperature superconductivity in copper oxides (cuprates) by focusing on hole doping cases based on the view that it is realized in carrier doped Mott insulators, as noted by Anderson in the initial stage.
Book ChapterDOI
The high-Tc superconductors: a conservative view
TL;DR: In this article, the role of quasilowdimensionality for delocalized electrons was stressed, and the potential superiority of fine mesh three dimensional networks of chain conductors argued from that point of view.
Journal ArticleDOI
Electronic structure of rare-earth infinite-layer R Ni O 2 ( R = La , Nd )
TL;DR: In this article, the authors performed first-principles calculations of infinite-layer nickelate compounds and compared them with that of cuprate compounds using the hybrid functional method together with Wannier projection and group symmetry analysis.