The superconducting gap of emin situ MgB₂ thin films by microwave surface impedance measurements
Hakim, N. · Kusko, C. · Sridhar, S. · Soukiassian, A. · Zeng, X. H. · Xi, X. X. · .
الأصل · EN
Precision measurements of the microwave surface resistance Rₛ of in situ MgB₂ films directly reveal an exponential behavior of Rₛ at low temperature indicating a fully-gapped order parameter. The entire temperature dependence of Rₛ is well described by a Mattis-Bardeen formalism but with a small gap ratio of Δ(0)/kTc=0.72, corresponding to Δ(0)=1.9meV.
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