Abstract
Positive muon spin relaxation experiments have been conducted on the heavy-fermion superconductor UPt3 in both the normal and superconducting states for zero, transverse, and longitudinally applied magnetic fields. Below 6 K in zero applied field, the μ+ relaxation rate is approximately twice that expected from195Pt nuclear dipolar relaxation alone. Transverse- and longitudinal-field measurements show that the observe relaxation rate depends on magnetic field and is quasistatic in origin. It is suggested that the onset of very weak (≈10−3 μB/U atom) magnetic ordering below approximately 6 K is responsible for the observed increase in the relaxation rate. μ+ Knight shift measurements in the normal state of UPt3 show a temperature dependent shift Kμ which tracks the bulk susceptibility X. From the Kμ vs. X plot, a μ+ hyperfine field of approximately 100 Oe/μB is extracted.
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