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      A new method of probing the phonon mechanism in superconductors, including MgB2

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      Author
      Park, M.-A.
      Savran, K.
      Kim, Y.-J.
      Date
      2001
      Journal Title
      Superconductor Science and Technology
      Print ISSN
      0953-2048
      Volume
      14
      Issue
      7
      Pages
      L31 - L35
      Language
      English
      Type
      Article
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      Please cite this item using this persistent URL
      http://hdl.handle.net/11693/24842
      Abstract
      Weak localization has a strong influence on both the normal and superconducting properties of metals. In particular, since weak localization leads to the decoupling of electrons and phonons, the temperature dependence of resistance (i.e. λtr) decreases with increasing disorder, as manifested by Mooij's empirical rule. In addition, Testardi's universal correlation of Tc (i.e. λ) and the resistance ratio (i.e. λtr) follows. This understanding provides a new means to probe the phonon mechanism in superconductors, including MgB2. The merits of this method are its applicability to any superconductor and its reliability because the McMillan's electron-phonon coupling constant λ and λtr change in a broad range, from finite values to zero, due to weak localization. Karkin et al's preliminary data of irradiated MgB2 show the Testardi correlation, indicating that the dominant pairing mechanism in MgB2 is a phonon-mediated interaction.
      Published as
      http://dx.doi.org/10.1088/0953-2048/14/7/103
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      • Department of Physics 2136

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