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Intrinsic Pinning in the High Field C-Phase of UPt_3

Brett Ellman·Louis Taillefer
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Abstract

We report on the a.c. magnetic response of superconducting UPt_3 in a d.c. magnetic field. At low fields (H < H^*), the in-phase susceptibility shows a sharp drop at $T_c$ followed by a gradual decrease with decreasing temperature, while the out-of-phase component shows a large peak at T_c followed by an unusual broad peak. As the B-C phase line is crossed (H>H^*), however, both the in-phase and out-of-phase susceptibilities resemble the zero-field Meissner curves. We interpret these results in terms of a vortex pinning force which, while comparatively small in the A/B-phases, becomes large enough to effectively prevent vortex motion in the C-phase.

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Brett Ellman, Louis Taillefer. 1997-07-20. Intrinsic Pinning in the High Field C-Phase of UPt_3. https://doi.org/10.1103/physrevb.56.r5767

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