1995/11/15 by Brett Ellman, Louis Taillefer, M. Poirier +1 · 1 citation
Physics and Astronomy · #Advanced Condensed Matter Physics #Physics of Superconductivity and Magnetism #Rare-earth and actinide compounds #cond-mat
paper · pdf · doi:10.1103/physrevb.54.9043
arxiv created 1995/11/15 · openalex publication_date 1996/10/01 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
We have measured the transverse ultrasonic attenuation \mathrm\ensuremathα_q\mathrm\ensuremathε in a well-characterized single crystal of UPt3 for propagation direction q in the basal plane and polarization \ensuremathε in and out of the plane. Unlike previous measurements, the sample was of sufficient purity to exhibit three well-defined phases as a function of temperature and magnetic field. We uncover a functional dependence for the attenuation in the (zero-field) high-temperature (A) phase which is distinctly different than that in the low-temperature (B) phase. Our data provide new directional information on the quasiparticle momentum distribution in this largely unstudied phase of UPt3 and direct evidence that the two zero-field phases possess different order parameters. \textcopyright 1996 The American Physical Society.