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Theory of gap-node detection by angle-resolved specific heat measurement

P Miranović1, M Ichioka2, K Machida2 and N Nakai3

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The specific heat oscillation in the mixed state of type II superconductors is studied theoretically when rotating a field within a plane containing a gap minimum and maximum. The calculations are performed microscopically by solving the 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 behaviour due to the Fermi velocity.


PACS

74.25.Bt Thermodynamic properties

74.70.-b Superconducting materials

74.25.Qt Vortex lattices, flux pinning, flux creep

74.25.Op Mixed states, critical fields, and surface sheaths

74.25.Jb Electronic structure

Subjects

Superconductivity

Dates

Issue 50 (21 December 2005)

Received 11 July 2005, in final form 30 September 2005

Published 2 December 2005



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