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Published April 1, 1987 | Published
Journal Article Open

Transverse sound in a magnetic field in UPt_3

Abstract

We have propagated transverse sound in a magnetic field in the basal plane of UPt_3, with the polarization vector oriented both in the basal plane and perpendicular to it. We observe a strong anisotropy in the magnetic field dependence of the attenuation for the two polarizations. Using a simple phenomenological model, we can understand the low-temperature field dependence as a natural consequence of the anisotropy with temperature in zero field reported earlier [Phys. Rev. Lett. 56, 1078 (1986)]. However, for increasing temperatures there are significant deviations from this model. In no case do we find evidence for new superconducting phases in a magnetic field.

Additional Information

© 1987 The American Physical Society. Received 11 December 1986. We should like to acknowledge helpful discussions with S. R. Nagel, K. Quader, C. M. Varma, and P. Wölfle. One of us (B.S.S.) thanks K. Scharnberg for useful correspondence. The work at Argonne National Laboratory was supported by the U. S. Department of Energy under Contract No. W-31-109-ENG-38. The work at The University of Chicago was supported by the National Science Foundation under Grant No. DMR 8351992. One of us (T.F.R.) acknowledges partial financial support from the Alfred P. Sloan Foundation.

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