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Published March 9, 1992 | Published
Journal Article Open

Uniaxial-stress anisotropy of the double superconducting transition in UPt_3

Abstract

We study the specific heat of single-crystal UPt_3 for uniaxial stress 0≤S≤4 kbar. For S∥c^, the lower and upper superconducting transitions move towards each other in temperature and merge by S=2 kbar and T=485 mK. In the normal state, the Sommerfeld constant γ increases 12% by 2 kbar and then plateaus. By contrast, for S∥a^, γ decreases steadily and the onset T_c's of the two superconducting transitions remain essentially unchanged, although the specific-heat peaks broaden markedly. Residual strain in the basal plane may account for some crystals of UPt_3 showing only one broad superconducting transition.

Additional Information

© 1992 The American Physical Society. Received 30 September 1991; revised manuscript received 21 January 1992. The work at The University of Chicago was supported by NSF DMR 8816817. D.S.J. acknowledges support from a National Science Foundation Graduate Fellowship. D.G.H. acknowledges support by the Department of Energy, BES, under Contract No. W-31-109-ENG-38.

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Published - PhysRevLett.68.1597.pdf

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