Superconducting gap anisotropy of LuNi2B2C thin films from microwave surface impedance measurements

Details Superconducting gap anisotropy of LuNi2B2C thin films from microwave surface impedance measurements Superconducting gap anisotropy of LuNi2B2C thin films from microwave surface impedance measurements

2001-03-05

arxiv.org/abs/cond-mat/0103111v1

Physics

Condensed Matter

Superconductivity

15 pages, 4 figures

Scientific paper

10.1103/PhysRevB.64.100505

Surface impedance measurements of LuNi2B2C superconducting thin films as a function of temperature have been performed down to 1.5 K and at 20 GHz using a dielectric resonator technique. The magnetic penetration depth closely reproduces the standard B.C.S. result, but with a reduced value of the energy gap at low temperature. These data provide evidence for an anisotropic s-wave character of the order parameter symmetry in LuNi2B2C. From the evaluation of the real part of complex conductivity, we have observed constructive (type II) coherence effects in the electromagnetic absorption below Tc.

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