Localized character of the 'metallic' state in high Tc superconductors

被引：0
|
作者：
Dallacasa, V. [1 ]
Feduzi, R. [1 ]
机构：
[1] Udine Univ, Udine, Italy
来源：
Journal of Alloys and Compounds | 1993年 / 195卷 / 1-2期
关键词：
Defects - Metal insulator boundaries - Metals - Superconducting materials;
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学科分类号：
摘要：
The resistivity behaviour of a large series of polycrystalline samples at different defect (carrier) concentrations is discussed using the form p0 exp(T0/T)b in which p0 is a temperature-dependent parameter. This equation allows to examine the gradual and characteristic change of p(T) as a function of carrier concentration observed in single-crystals as well as in polycrystalline superconductors within an single mechanism. A cross-over between the b= 1/2 and the b= 1/4 regimes is found. The 'metallic' dependence of the normal resistivity state has a induced-disorder localized character.
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页码：531 / 534
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