The spin-polaron theory of high-Tc superconductivity
The spin-polaron theory of high-Tc superconductivity
复制标题
高温超导自旋极化子理论
DOI：
10.1080/00018739000101471
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发表时间：
1990
影响因子：
--
通讯作者：
N. Mott
中科院分区：
文献类型：
--
作者：
N. Mott
摘要给出了一些高温超导体的模型概要，该模型假设载流子是（杂化）氧 2p 能带中的空穴，并与铜原子上的矩形成“自旋极化子”。对 Gd3-x v x S4 中自旋极化子的观察结果以及 La1-x Sr x VO3 的性质与 La2-x Sr x CuO4 的性质进行了比较。根据几位作者的说法，假设超导体中的极化子形成双极化子，即玻色子，并与该假设的其他一些处理方法进行了比较。有人提出，在许多此类超导体中，玻色子（本质上是一对这样的空穴）在杂质带中移动，并且通常所有极化子（费米子）形成双极化子；费米子在同一位点上相互排斥（正哈伯德 U），但在相邻位点上相互吸引；临界温度 T c 是玻色气体变得非简并的温度。在这种材料中，玻色子的非简并气体将携带电流...
Abstract An outline is given of the model for some high-temperature superconductors which assumes that the carriers are holes in the (hybridized) oxygen 2p band and form ‘spin polarons’ with the moments on the copper atoms. A comparison is made with observations of spin polarons in Gd3-x v x S4 and with the properties of La1-x Sr x VO3 in relation to those of La2-x Sr x CuO4. It is assumed, following several authors, that in the superconductors the polarons form bipolarons, which are bosons, and a comparison is made with some other treatments of this hypothesis. It is proposed that in many such superconductors the boson, essentially a pair of these holes, moves in an impurity band, and that normally all the polarons (fermions) form bipolarons; the fermions repel each other on the same site (positive Hubbard U) but attract when on adjacent sites; the critical temperature T c is then that at which the Bose gas becomes non-degenerate. In such materials a non-degenerate gas of bosons would carry the current a...