Anisotropy of the Magnetic-Field-Induced Phase Transition in Superconducting UPt3

Author(s): A. Schenstrom, M -F. Xu, Y. Hong, D. Bein, M. Levy, Bimal K. Sarma, S. Adenwalla, Z. Zhao, T. Tokuyasu, D. W. Hess, J. B. Ketterson, J. A. Sauls, and D. G. Hinks
Comments: 4 Journal pages
Journal-ref: Phys. Rev. Lett. 62, 332-335 (1989)

Measurements of the attenuation of longitudinal ultrasound in superconducting UPt3 show a peak, below Hc2, which depends strongly on the orientation of the field relative to the c axis. We propose an explanation of this peak in terms of a vortex phase transition in an unconventional superconducting state, which is consistent with recent neutron-scattering data.

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