Abstract
The superconducting transition temperature of hexagonal and orthorhombic ZrRuP was studied under hydrostatic and quasi-hydrostatic pressures up to 7 GPa. It was found that the superconducting transition temperature decreases with the pressure slightly for both structures of this compound. The rate of T c change with pressure is ( dT c dP ) = −53 mK (GPa) −1 for hexagonal structure and ( dT c dP ) = −98 mK (GPa) −1 for orthorhombic structure. We calculated the logarithmic volume derivative of the electron-phonon coupling parameter λ e-ph using the McMillan equation. It was found that under pressure the change in the coupling parameter depends mainly on the change of the phonon frequency with the pressure.
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