Critical temperature variation with nonstoichiometry in high-temperature superconductors

被引：4
|
作者：
Buzea, C
Yamashita, T
机构：
[1] Tohoku Univ, Elect Commun Res Inst, Aoba Ku, Sendai, Miyagi 9808577, Japan
[2] Tohoku Univ, NICHe, Aoba Ku, Sendai, Miyagi 9808579, Japan
[3] Japan Sci & Technol, JST, CREST, Kawaguchi, Saitama 3200012, Japan
来源：
PHYSICA C | 2001年 / 357卷 / 357-360期
基金：
日本学术振兴会;
关键词：
transition temperature variation; doping; substitutions; high-T-c compounds; low-T-c compounds;
D O I：
10.1016/S0921-4534(01)00254-4
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
We present a phenomenological model able to explain the critical temperature dependence on nonstoichiometry T-c(x) in high-temperature superconductors. We assume that nonisovalent substitutions in a nonsuperconducting material lead to the appearance of superconducting regions with spherical shape, inside which the buckling of the Cu-O bonds (achieved through electrostatic interactions) is favorable to superconductivity. We obtain T-c taking into account its proportionality to the superconducting volume fraction. which is calculated as a function of doping content x. Our theoretical results fit very well experimental data for T-c versus doping. (C) 2001 Elsevier Science B.V. All rights reserved.
引用
收藏
页码：288 / 290
页数：3
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