The superconducting gap of \QTR{em}{in situ} $MgB_{2}$ thin films by microwave surface impedance measurements

N. Hakim; C. Kusko; S. Sridhar; A. Soukiassian; X. H. Zeng; X. X. Xi; .

doi:10.1063/1.1517181

paper

The superconducting gap of \QTR{em}{in situ} $M g B_{2}$ thin films by microwave surface impedance measurements

arXiv:cond-mat/0212009 · doi:10.1063/1.1517181

Abstract

Precision measurements of the microwave surface resistance $R_{s}$ of in situ $M g B_{2}$ films directly reveal an exponential behavior of $R_{s}$ at low temperature indicating a fully-gapped order parameter. The entire temperature dependence of $R_{s}$ is well described by a Mattis-Bardeen formalism but with a small gap ratio of $Δ (0) / k T_{c} = 0.72$ , corresponding to $Δ (0) = 1.9 m e V$ .

The superconducting gap of \QTR{em}{in situ} MgB2​ thin films by microwave surface impedance measurements

Abstract

The superconducting gap of \QTR{em}{in situ} $M g B_{2}$ thin films by microwave surface impedance measurements