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Implications of reflectance measurements on the mechanism for superconductivity in MgB$_2$ | | F. Marsiglio
; | | Date: |
24 Jul 2001 | | Journal: | Physical Review Letters 87 247001 (2001) | | Subject: | Superconductivity | cond-mat.supr-con | | Abstract: | Recent optical studies in c-axis oriented superconducting MgB$_2$ films indicate that the electron-phonon coupling is weak [tu01]. We reinforce this conclusion by examining the raw reflectance data; its frequency dependence is incompatible with strong electron-phonon scattering. This is further strengthened by analysis of the real part of the conductivity, and by the temperature dependence of the effective Drude scattering rate. Using a realistic electron-phonon spectral shape [kong01], we find $lambda_{
m tr} approx 0.15$, in agreement with Tu et al. [tu01]. To the extent that $lambda_{
m tr} approx lambda$, this disagrees sharply with model calculations [kong01,kortus01,an01], and is far too low to provide the means for $T_c = 39 $ K. A simple model is constructed with coupling to a high frequency excitation, which is consistent with both the low frequency optical data and the high $T_c$. | | Source: | arXiv, cond-mat/0107486 | | Services: | Forum | Review | PDF | Favorites | |
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