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THE PRESSURE DEPENDENCE OF ENERGY GAP FOR MIXED CRYSTAL Hg0.3Cd0.7Te

JIANG SHAN ZHU HAO-RONG SHEN XUE-CHU J. SCHILZ

THE PRESSURE DEPENDENCE OF ENERGY GAP FOR MIXED CRYSTAL Hg0.3Cd0.7Te

JIANG SHAN, ZHU HAO-RONG, SHEN XUE-CHU, J. SCHILZ
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  • Received Date:  03 January 1989
  • Published Online:  08 July 2005

THE PRESSURE DEPENDENCE OF ENERGY GAP FOR MIXED CRYSTAL Hg0.3Cd0.7Te

  • 1. 中国科学院上海技术物理研究所红外物理开放研究实验室

Abstract: The absorption edge of p-Hg1-xCdxTe with x = 0.7 has been measured at different pressures in the range of 0-36kbar and room temperature. The experimental energy gap is basically in agreement with the result calculated by empirical formula The first order pressure coefficient of Hg1-xCdx Te obtained by a least square fitting to experimental data under different pressures is a = 8.7×10-11eV/Pa, which can be explained by chemical bond dielectric function theory. The second order pressure coefficient of energy gap has also been obtained experimentally as β= -6.3×l0-13eV/ kbar which is hard to understand theoretically. In addition, a structural phase transition has been found under 34-36kbar.

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