We discuss aspects of the response to an externally applied electromagnetic field of a superconductor with an order parameter of E lg symmetry, possibly realized in the heavy fermion compound UPt 3 . From the electromagnetic response function K(% MathType!MTEF!2!1!+- % feaafeart1ev1aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn % hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr % 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqaqpepeea0xe9qqVa0l % b9peea0lb9sq-JfrVkFHe9peea0dXdarVe0Fb9pgea0xa9pue9Fve9 % Ffc8meGabaqaciGacaGaaeqabaWaaeaaeaaakeaaceqGXbGba4aaaa % a!3885! \[ {\rm{\mathord{\buildrel{\lower3pt\hbox{$\scriptscriptstyle\rightharpoonup$}} \over q} }} \], Ω) we extract the low-frequency reactive response, which determines the inductive skin depth, including the effects of impurity potential scattering with arbitrary phase shifts. Comparison with a series of recent experiments on UPt 3 at temperatures T ≪ T csuggests that a state with E lg symmetry may be a good candidate for the ground state of this material. While comparison to some experiments are promising at low temperature, we are unable to fit the experimental data over the entire temperature range with a single normal-state elastic scattering parameter Τ, and discuss possible explanations for this discrepancy.
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Hirschfeld, P.J., Putikka, W.O., Wölfle, P. et al. Electromagnetic skin depth of unconventional superconductors. J Low Temp Phys 88, 395–420 (1992). https://doi.org/10.1007/BF00126602
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DOI: https://doi.org/10.1007/BF00126602