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

Louis Taillefer·Brett Ellman·Benoit Lussier·Mario Poirier
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Abstract

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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Louis Taillefer, Brett Ellman, Benoit Lussier, Mario Poirier. 1996-09-17. On the gap structure of UPt$_3$: phases A and B. https://doi.org/10.1016/s0921-4526(96)00706-5

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