Evidence for a two component magnetic response in UPt3
A. Yaouanc, P. Dalmas de Reotier, F. N. Gygax, A. Schenck, A. Amato, C. Baines, P. C. M. Gubbens, C. T. Kaiser, A. de Visser, R. J. Keizer, A. Huxley, A. A. Menovsky
Abstract
The magnetic response of the heavy fermion superconductor UPt3 has been investigated on a microscopic scale by muon Knight shift studies. Two distinct and isotropic Knight shifts have been found for the field in the basal plane. While the volume fractions associated with the two Knight shifts are approximately equal at low and high temperatures, they show a dramatic and opposite temperature dependence around TN. Our results are independent on the precise muon localization site. We conclude that UPt3 is characterized by a two component magnetic response.
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