Anisotropy of Transverse Sound in the Heavy-Fermion Superconductor UPt_3

Creators: Shivaram, B. S.; Jeong, Y. H.; Rosenbaum, T. F.; Hinks, D. G.

Abstract

We report the first measurements of the attenuation of ultrasound in the basal plane of superconducting UPt_3. Transverse sound propagating along the b axis shows a marked anisotropy in its temperature dependence when the polarization is rotated in and out of the basal plane. For polarization in the basal plane the attenuation varies linearly with temperature down to 35 mK and the slope scales as the square of the frequency. Our results appear to indicate the presence of an additional attenuation mechanism when compared with recent theories of anisotropic superconductors in the dirty limit.

Additional Information

© 1986 The American Physical Society. Received 18 December 1985. We should like to thank A. Auerbach, S. N. Coppersmith, G. Crabtree, A. J. Leggett, S. R. Nagel, J. P. Rodriguez, and especially D. Pines for helpful conversations. We appreciate the loan of Armstrong Adhesive from M. Levy. The work at Argonne National Laboratory was supported by the U. S. Department of Energy, Basic Energy Sciences Materials Sciences under Contract No. W-31-109-ENG-38. The work at the University of Chicago was supported by the National Science Foundation under Contract No. DMR 8351992, The Materials Research Laboratory, and a Joseph H. DeFrees Grant from Research Corporation. One of us (T.F.R.) acknowledges receipt of an Alfred P. Sloan Fellowship.

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