Anomalous coherence peak in the microwave conductivity of c-axis oriented MgB(2) thin films

Jin BB, Dahm T, Gubin AI, Choi EM, Kim HJ, Lee SI, Kang WN, Klein N (2003)
Physical Review Letters 91(12).

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Abstract
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 MgB(2) 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 MgB(2). Our model assumes there is no interband impurity scattering and a weak interband pairing interaction, as suggested by band structure 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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Jin BB, Dahm T, Gubin AI, et al. Anomalous coherence peak in the microwave conductivity of c-axis oriented MgB(2) thin films. Physical Review Letters. 2003;91(12).
Jin, B. B., Dahm, T., Gubin, A. I., Choi, E. M., Kim, H. J., Lee, S. I., Kang, W. N., et al. (2003). Anomalous coherence peak in the microwave conductivity of c-axis oriented MgB(2) thin films. Physical Review Letters, 91(12).
Jin, B. B., Dahm, T., Gubin, A. I., Choi, E. M., Kim, H. J., Lee, S. I., Kang, W. N., and Klein, N. (2003). Anomalous coherence peak in the microwave conductivity of c-axis oriented MgB(2) thin films. Physical Review Letters 91.
Jin, B.B., et al., 2003. Anomalous coherence peak in the microwave conductivity of c-axis oriented MgB(2) thin films. Physical Review Letters, 91(12).
B.B. Jin, et al., “Anomalous coherence peak in the microwave conductivity of c-axis oriented MgB(2) thin films”, Physical Review Letters, vol. 91, 2003.
Jin, B.B., Dahm, T., Gubin, A.I., Choi, E.M., Kim, H.J., Lee, S.I., Kang, W.N., Klein, N.: Anomalous coherence peak in the microwave conductivity of c-axis oriented MgB(2) thin films. Physical Review Letters. 91, (2003).
Jin, BB, Dahm, Thomas, Gubin, AI, Choi, EM, Kim, HJ, Lee, SI, Kang, WN, and Klein, N. “Anomalous coherence peak in the microwave conductivity of c-axis oriented MgB(2) thin films”. Physical Review Letters 91.12 (2003).
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