Superconductivity of WC in the NaCl-Type Structure under Pressure

概要

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Here we report the theoretical calculations of band structure and superconductivity of WC in the NaCl-type structure. The effect of pressure on the band structure is obtained using the linear muffin-tin orbital method. The superconducting transition temperature is calculated using McMillan's formula. The value of T_c at ambient conditions is 5.98 K which increases on compression. The increase in T_c values with pressure may be due to continuous transfer of s electrons from the carbon site to d states of the tungsten site. The calculated value of T_c at ambient pressure and the positive pressure coefficient of T_c are in agreement with other transition metal carbides and nitrides.
社団法人応用物理学会の論文
1994-04-15