Thermal Conductivity and Gap Structure of the Superconducting Phases of UPt3

Details Thermal Conductivity and Gap Structure of the Superconducting Phases of UPt3 Thermal Conductivity and Gap Structure of the Superconducting Phases of UPt3

1997-02-11

arxiv.org/abs/cond-mat/9702089v1

Physics

Condensed Matter

Strongly Correlated Electrons

21 pages, 9 Figures, Latex, to be published in Journal of Low Temperature Physics

Scientific paper

10.1007/BF02396814

We present new measurements of the thermal conductivity of UPt3 down to very low temperatures (16mK) and under magnetic fields (up to 4 T) which cover all the superconducting phases of UPt3. The measurements in zero field are compared with recent theoretical predictions for the thermal conductivity, which is dominated by impurity states at the lowest temperatures studied. The measurements under magnetic field at low temperatures are surprising since they don't show the expected low field square root dependence. The discontinuity of d kappa/dT at Tc changes drastically when passing from the high field low temperature C phase to the low field high temperature A phase : this is related to the change of the symmetry of the superconducting order parameter when crossing the A - C phase transition.

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