Powell B J, McKenzie Ross H
Department of Physics, University of Queensland, Brisbane, Queensland 4072, Australia.
Phys Rev Lett. 2005 Feb 4;94(4):047004. doi: 10.1103/PhysRevLett.94.047004. Epub 2005 Feb 1.
We present a resonating-valence-bond theory of superconductivity for the Hubbard-Heisenberg model on an anisotropic triangular lattice. Our calculations are consistent with the observed phase diagram of the half-filled layered organic superconductors, such as the beta, beta', kappa, and lambda phases of (BEDT-TTF)2X [bis(ethylenedithio)tetrathiafulvalene] and (BETS)2X [bis(ethylenedithio)tetraselenafulvalene]. We find a first order transition from a Mott insulator to a dx2-y2 superconductor with a small superfluid stiffness and a pseudogap with dx2-y2 symmetry.
我们提出了一种适用于各向异性三角晶格上哈伯德 - 海森堡模型的超导共振价键理论。我们的计算结果与观测到的半填充层状有机超导体的相图一致，例如（BEDT - TTF）₂X [双（乙二硫基）四硫富瓦烯] 和（BETS）₂X [双（乙二硫基）四硒富瓦烯] 的β、β'、κ和λ相。我们发现从莫特绝缘体到具有小超流刚度和dx₂ - y₂对称性赝能隙的dx₂ - y₂超导体存在一级相变。
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