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arxiv: cond-mat/0304051 · v2 · submitted 2003-04-02 · ❄️ cond-mat.supr-con

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

B.B. Jin (1) , T. Dahm (2) , A.I. Gubin (3) , Eun-Mi Choi (4) , Hyun Jung Kim (4) , Sung-IK Lee (4) , W.N.Kang (5) , N. Klein (1) ((1) ISG-2
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Forschungszentrum Juelich GmbH Juelich Germany (2) University Tuebingen Institut fuer Theoretische Physik Germany (3) Usikov Institute of Radiophysics Electronics Kharkov Ukraine (4) National Creative Research Initiative Center for Superconductivity Department of Physics Pohang University of Science Technology Korea (5) Department of Physics Pukyung National University Pusan Korea)
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classification ❄️ cond-mat.supr-con
keywords coherenceconductivitymgb2peaktemperatureanomalousc-axiscalculations
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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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