Anomalous microwave conductivity coherence peak in c-axis MgB2 thin film

Details Anomalous microwave conductivity coherence peak in c-axis MgB2 thin film Anomalous microwave conductivity coherence peak in c-axis MgB2 thin film

2003-04-02

arxiv.org/abs/cond-mat/0304051v2

Physical Review Letters, Vol. 91, 127006(2003)

Physics

Condensed Matter

Superconductivity

10 pages, 4 figures, to be published in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.91.127006

The temperature dependence of the real part of the microwave complex conductivity at 17.9 GHz obtained from surface impedance measurements of two c-axis oriented MgB2 thin films reveals a pronounced maximum at a temperature around 0.6 times the critical temperature. Calculations in the frame of a two-band model based on Bardeen-Cooper-Schrieffer (BCS) theory suggest that this maximum corresponds to an anomalous coherence peak resembling the two-gap nature of MgB2. Our model assumes there is no interband impurity scattering and a weak interband pairing interaction, as suggested by bandstructure calculations. In addition, the observation of a coherence peak indicates that the pi-band is in the dirty limit and dominates the total conductivity of our films

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