On the gap structure of UPt$_3$: phases A and B

Details On the gap structure of UPt$_3$: phases A and B On the gap structure of UPt$_3$: phases A and B

1996-09-17

arxiv.org/abs/cond-mat/9609161v1

Physics

Condensed Matter

10 pages, 3 figures, to appear in proceedings of SCES96

Scientific paper

10.1016/S0921-4526(96)00706-5

We have used thermal conduction and transverse sound attenuation to probe the anisotropy of the gap structure in two superconducting phases of UPt$_3$. For the low-temperature phase B, transverse sound has in the past provided strong evidence for a line node in the basal plane. Now, from the anisotropy of the thermal conductivity we further establish the presence of a node along the c-axis and provide information on its k-dependence. For the largely unexplored high-temperature phase A, our study of the attenuation for two directions of the polarization yields directional information on the quasiparticle spectrum, and the first clear indication of a different gap structure in the two phases.

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