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

Mi Ae Park; Kerim Savran; Yong Jihn Kim

doi:10.1088/0953-2048/14/7/103

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

Mi Ae Park, Kerim Savran, Yong Jihn Kim

Research output: Contribution to journal › Article › peer-review

10 Scopus citations

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. λ_tr) decreases with increasing disorder, as manifested by Mooij's empirical rule. In addition, Testardi's universal correlation of T_c (i.e. λ) and the resistance ratio (i.e. λ_tr) 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 λ_tr 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.

Original language	English (US)
Pages (from-to)	L31-L35
Journal	Superconductor Science and Technology
Volume	14
Issue number	7
DOIs	https://doi.org/10.1088/0953-2048/14/7/103
State	Published - Jul 2001
Externally published	Yes

ASJC Scopus subject areas

Condensed Matter Physics
Ceramics and Composites
Metals and Alloys
Materials Chemistry
Electrical and Electronic Engineering

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10.1088/0953-2048/14/7/103

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

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.",

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AU - Savran, Kerim

AU - Kim, Yong Jihn

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N2 - 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.

AB - 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.

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

Abstract

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