高温超导体结构的特殊性 PW. Anderson. science 235,1196(1987). 准二维特征,关键 结构是Cu-O面 超导电性是通过掺 杂Mott绝缘体而实 Fig. 1. (A)Crystal structure of La uo, the"parent compound"of the Lap-- uo, family of 现的 high-temperature superconductors The crucial structural subunit is the Cu-o, plane, which extends in the ab direction parts of three Cuo 2 planes are shown. Electronic couplings in the substituting S ions for some of the la ions indicated, or by adding interstitial oxygen. In other. interplane(e drection are very weak. In the La Cuo, family of materials, doping is achieved by 原有的金属理论从 families of high-T materials(eg. YBa Cu O the crystal structure and mechanism of doping are lightly different, but all materials share the feature of Quo, planes weakly coupled in the 根本上可能不适用 transverse direction. (B) Schematic of Cuo, plane, the crucial structural subunit for high-T, superconductivity. Red arrows indicate a possible alignment of spins in the antiferromagnetic ground state of La CuO, Speckled shading indicates oxygen'P, orbitals; coupling through these orbitals leads to superexchange in the insulator and camier motion in the doped, metal k state高温超导体结构的特殊性 P.W. Anderson, Science 235, 1196(1987). • 准二维特征，关键 结构是Cu-O面 • 超导电性是通过掺 杂Mott 绝缘体而实 现的 • 原有的金属理论从 根本上可能不适用