How to detect gap nodes of a superconductor by angle-resolved specific heat experiment?

Details How to detect gap nodes of a superconductor by angle-resolved specific heat experiment? How to detect gap nodes of a superconductor by angle-resolved specific heat experiment?

2004-09-14

arxiv.org/abs/cond-mat/0409371v1

Physics

Condensed Matter

Superconductivity

6 pages, 4 figures

Scientific paper

The specific heat oscillation in the mixed state of type II superconductors is studied theoretically when rotating field within a plane containing gap minimum and maximum. The calculations are performed microscopically by solving quasi-classical Eilenberger equation for vortex lattices. The field dependence of the oscillation amplitude can discriminate between the nodal and anisotropic gap with a finite minimum and the oscillation phase gives the gap minimum position on the Fermi surface. These also provide a way to separate out the anisotropic behavior due to the Fermi velocity.

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