Abstract
A 2D electron gas Hall probe was used to measure the local magnetic induction B( H, T) of the heavy-electron superconductor UPt 3 below T c. We interpret these results to imply the formation of a spontaneous magnetization, broken into domains for applied fields greater than H c1. This is in agreement with recent μSR results, which suggested the appearance of an inhomogeneous magnetization in applied fields in addition to the spontaneous magnetization that was observed in zero applied fields. Taken together, this suggests that the low-temperature superconducting state of UPt 3 is unconventional and of odd parity.
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