Minimum metallic conductivity in a thin crystal |
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| Authors: | HH Soonpaa |
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| Institution: | Physics Department, University of North Dakota Grand Forks, North Dakota 58202, USA |
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| Abstract: | Electrical conductivities of thin crystals of Bi2(Te,S)3 measured from 4.2°K to 300°K fall into four regions: 1) σ < 1.3×10?5 S with positive temperature coefficient of conductivity; 2) 1.3×10?5 S < σ < 1.4×10?5 S with temperature independent conductivity; 3) 1.4×10?5 S σ < 4×10?5 S with negative temperature coefficient of conductivity, and 4) σ > 4×10?5 S with hardly any temperature dependence. A disproportionately high fraction of samples falls into the second range; 1.3×10?5 S < σ < 1.4×10?5 S. |
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