High-pressure effect on the superconductivity of YB6

S. Gabáni, I. Takáčová, G. Pristáš, E. Gažo, K. Flachbart, T. Mori, D. Braithwaite, M. Míšek, K. V. Kamenev, M. Hanfland, and P. Samuely
Phys. Rev. B 90, 045136 – Published 28 July 2014

Abstract

Pressure effects on superconducting properties of two YB6 samples (Tc=5.9 and 7.5 K) were investigated by measurements of electrical resistivity, magnetic susceptibility, and x-ray diffraction in the pressure range up to 320 kbar. Magnetoresistivity measurements down to 60 mK and up to 47 kbar have shown a negative pressure effect on Tc as well as on the third critical field Hc3 with the slopes dlnTc/dp=0.59%/kbar and dlnHc3/dp=1.1%/kbar, respectively. The magnetic susceptibility measurements evidenced that the slope of dlnTc/dp gradually decreases with pressure reaching a value three times smaller at 112 kbar. The lattice parameter measurements revealed the volume reduction of 14% at 320 kbar. The pressure-volume dependence is described by the Rose-Vinet equation of state. The obtained relative volume dependence dlnTc/dlnV analyzed by the McMillan formula for Tc indicates that the reduction of the superconducting transition temperature is mainly due to hardening of the Einstein-like phonon mode responsible for the superconducting coupling. This is confirmed by the analysis of the resistivity measurements in the normal state up to T=300 K performed at pressures up to 28 kbar.

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  • Received 20 May 2014
  • Revised 8 July 2014

DOI:https://doi.org/10.1103/PhysRevB.90.045136

©2014 American Physical Society

Authors & Affiliations

S. Gabáni1,*, I. Takáčová1, G. Pristáš1, E. Gažo1, K. Flachbart1, T. Mori2, D. Braithwaite3, M. Míšek4, K. V. Kamenev4, M. Hanfland5, and P. Samuely1

  • 1Centre of Low Temperature Physics, Institute of Experimental Physics, Slovak Academy of Sciences, Watsonova 47, 040 01 Košice, Slovakia
  • 2Advanced Materials Laboratory, National Institute for Materials Science, Namiki 1-1, 305 0044 Tsukuba, Japan
  • 3Université Grenoble Alpes, INAC-SPSMS, F-38000 Grenoble, France and CEA, INAC-SPSMS, F-38000 Grenoble, France
  • 4Centre for Science at Extreme Conditions, University of Edinburgh, Mayfield road, EH9 3JZ Edinburgh, United Kingdom
  • 5European Synchrotron Radiation Facility, 6 Rue Jules Horowitz, 38000 Grenoble, France

  • *gabani@saske.sk

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Issue

Vol. 90, Iss. 4 — 15 July 2014

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