OXYGEN-DISORDER AND CORRELATION-EFFECTS ON THE HOLE CONCENTRATION AND METAL-NONMETAL TRANSITION IN YBA2CU3O6+X

被引：24

作者：

LATGE, A ^{[1
]}

ANDA, EV ^{[1
]}

MORANLOPEZ, JL ^{[1
]}

机构：

[1] UNIV AUTONOMA SAN LUIS POTOSI,INST FIS,SAN LUIS POTOSI 78000,MEXICO

来源：

PHYSICAL REVIEW B | 1990年 / 42卷 / 07期

关键词：

D O I：

10.1103/PhysRevB.42.4288

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A detailed analysis of the effect that oxygen disorder has on the electronic structure of the highly correlated high-Tc superconductors is presented. The system is modeled by a Hubbard-type Hamiltonian in which the on-site and intersite correlations between oxygen and copper atoms are included. The Green-function formalism is used to calculate the local electronic density of states at the Cu and O sites characteristic of YBa2Cu3O6+x as a function of oxygen concentration x and of the cation charge Q. Due to the large electronic interactions, a Mott-Anderson metal-nonmetal transition is obtained, in accordance with the experimental findings. The hole concentration n is calculated for disordered and ordered systems. A plateau in the concentration dependence of n is obtained for 0.45x0.75, only in the ordered system. The correlation functions of the various charge states in Cu and O are also calculated and discussed. © 1990 The American Physical Society.

引用

页码：4288 / 4297

页数：10

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