Inductive Response of Oriented UPt sub 3 in the Superconducting State

The inductive response of single crystals of UPt sub 3 have been studied from 1K-70 mK using mutual inductance techniques to measure chi exp ' and chi exp " at 31.7 and 317 Hz and tunnel diode resonant methods at 3 and 16 MHz, for the excitation fields parallel to the symmetry axis of the crystal. A double bump in the chi exp " measurements is clearly distinguishable and is consistent with the H = 0 phase diagrams of other workers. The temperature dependence of the magnetic penetration depth has been extracted from the measurements which indicate that the low-frequency results are linear for T/T sub c < 0.5, while the high-frequency data indicate a power-law dependence close to T exp 2 .