A new method of probing the phonon mechanism in superconductors, including MgB2
Author
Park, M.-A.
Savran, K.
Kim, Y.-J.
Date
2001Source Title
Superconductor Science and Technology
Print ISSN
0953-2048
Volume
14
Issue
7
Pages
L31 - L35
Language
English
Type
ArticleItem Usage Stats
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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.
Keywords
Electron tunnelingElectronic density of states
Heat resistance
Irradiation
Magnesium compounds
Phonons
Reliability
Superconductivity
Thermal effects
Electron phonon coupling constant
Magnesium bromide
Phonon mechanism
Phonon mediated interaction
Testardi correlation
Weak localization
Superconducting materials
Permalink
http://hdl.handle.net/11693/24842Published Version (Please cite this version)
http://dx.doi.org/10.1088/0953-2048/14/7/103Collections
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