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CONDENSED MATTER

Superconducting transition temperature in hafnium under pressures up to 64 GPa

I. O. Bashkin, M. V. Nefedova, V. G. Tissen, E. G. Ponyatovskii

Institute of Solid State Physics, Russian Academy of Sciences

Abstract: The superconducting transition temperature T _c of hafnium is measured as a function of pressure up to 64 GPa. The character of the pressure dependence of T _c observed at α–ω–β transitions in Hf is found to be similar to that observed for Zr. In the regions of α and β phases, T _c increases with pressure with the slopes dT _c /dP=0.05 and 0.16 K/GPa, respectively. At the α–ω transition, T _c (P) exhibits a tendency to a decrease, while at the ω–β transition, T _c increases stepwise from 5.8 to 8.0 K. The α–ω transition occurs at pressures between 31.2 and 35.9 GPa, and the ω–β transition, at a pressure of 62±2 GPa.

PACS: 64.70.Kb, 74.62.-c, 74.62.Fj

Received: 11.10.2004
Revised: 27.10.2004

 English version: Journal of Experimental and Theoretical Physics Letters, 2004, 80:10, 655–657

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