Inductive response of orientedUPt3in the superconducting state

Abstract

The inductive response of single crystals of ${\mathrm{UPt}}_3$ have been studied from 1 K to 70 mK using mutual inductance techniques to measure χ’ and χ’ ’ 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 χ’ ’ 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/${\mathit{T}}_{\mathit{c}}$<0.5, while the high-frequency data indicate a power-law dependence close to ${\mathit{T}}^2$.