LOCALIZATION EFFECTS AND METAL-INSULATOR TRANSITION IN OXIDE SUPERCONDUCTORS.

被引：0
|
作者：
Moshchalkov, V.V. [1 ]
机构：
[1] Moscow State Univ, Moscow, USSR, Moscow State Univ, Moscow, USSR
来源：
Physica C: Superconductivity and its Applications | 1988年 / 156卷 / 01期
关键词：
CERAMIC MATERIALS - OXIDES;
D O I：
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中图分类号：
学科分类号：
摘要：
Transport properties of high-T//c superconductors are analyzed on both insulating and metallic sides of the metal-insulator transition. The systematic change of the linear coefficient for resistivity versus temperature curves is explained as a result of the conductivity via metallic states in a narrow band with a bandwidth of 100-500 K determined by Sr concentration in La//2// minus //ySr//yCuO//4. The bandwidth W derived from the resistivity versus temperature curves fits the relation ln W varies directly as y** minus **1**/**3 which may be expected for the nearest-neighbour overlapping of strongly localized wave functions on Sr sites or oxygen sites in 123 compounds.
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页码：473 / 476
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