Vol. 53, No. 4
October 1999
pp. 765-774

Pressure dependence of the superconducting state parameters of metallic glass superconductor Mg₇₀Zn₃₀

MANISH GUPTA* , K S SHARMA^y and LACHHMAN DASS^z

* Department of Physics, Govt. MSJ College, Bharatpur 321 001, India
^y Directorate of College Education, Govt. of Rajasthan, Jaipur 302 004, India
^zDepartment of Physics, University of Rajasthan, Jaipur 302 004, India
* Address for correspondence: 20, Near Zila Parishad, Krishna Nagar, Bharatpur 321 001, India
MS received 2 March 1999; revised 9 June 1999

Abstract.

Explicit expressions have been derived for the volume dependence of electron-phonon coupling strength (l ) and the Coulomb pseudopotential (m * ) considering the variation of Fermi momentum (k_F ) and Debye temperature (q _D ) with volume. Ashcroft's model pseudopotential and RPA form of dielectric screening have been used for obtaining pressure dependence of transition temperature (T_C ) and the logarithmic volume derivative (F ) of the effective interaction strength (N₀ V ) for metallic glass superconductor Mg₇₀ Zn₃₀ . It has been observed that T_C of the metallic glass Mg₇₀ Zn₃₀ decreases rapidly with increase of pressure and the superconducting phase disappears at about 30% decrease of volume, for which the m * curve shows a minimum and an elbow is formed in the F graph.

Keywords. Superconductivity; metallic glass; superconducting state parameters; pressure depen-dence.

PACS Nos 74.30; 62.20; 61.40

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