# Unconventional superconductors under rotated magnetic field

Abstract:

Determination of the shape of the energy gap in unconventional superconductors via the bulk measurements is still an outstandingproblem. A candidate technique for finding the positions of zeroes(nodes) of the gap is via measurements of the anisotropy ofthermal and transport properties under a rotated magnetic field.This anisotropy was predicted from a semiclassical analysis andsubsequently found experimentally in the specific heat and thermalconductivity in several compounds. However, comparison of the two sets of measurements in some compounds, such as heavy fermion CeCoIn5,led to sometimes contradictory conclusions about the gap symmetry.After a review of the field, I will present the results of a microscopic  calculation of the anisotropy of the specific heat and thermalconductivity in anisotropic superconductors across the T-H phasediagram. I will propose that an inversion of the specific heat anisotropy atmoderate field and temperatures reconciles the existing experimental data, andwill explain the physical origin for this inversion. I will discuss the implications of these results for other unconventionalsuperconductors, and for future efforts to determine the gap symmetry from thethermodynamic and transport measurements.Ilya Vekhter

Toronto Quantum Matter Seminars
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