CRITICAL-BEHAVIOR OF THE CONDUCTIVITY IN METALLIC N-TYPE INP CLOSE TO THE METAL-INSULATOR-TRANSITION

被引:24
作者
BISKUPSKI, G [1 ]
ELKAAOUACHI, A [1 ]
BRIGGS, A [1 ]
机构
[1] CTR RECH TRES BASSES TEMP,CNRS,F-38042 GRENOBLE,FRANCE
关键词
D O I
10.1088/0953-8984/3/43/008
中图分类号
O469 [凝聚态物理学];
学科分类号
070205 ;
摘要
The metal-insulator transition (MIT) induced by a magnetic field, in barely metallic and compensated n-type InP has been re-examined. Using new analysis methods, we have determined the magnetic field for which the conductivity change from a metallic behaviour to a variable-range hopping regime. On the metallic side of the MIT, the electrical conductivity is found to obey sigma = sigma-0 + mT(s) down to 60 mK; the zero-temperature conductivity can be described by a scaling law with an exponent nu = 1 and there is no evidence for a minimum metallic conductivity. As the MIT is approached, we observe a clear crossover from a T1/2 to T1/3 temperature dependence of the conductivity, which is related to a competition between two length scales: the correlation length and the interaction length.
引用
收藏
页码:8417 / 8424
页数:8
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