Title
MgB2 : superconductivity and pressure effects MgB2 : superconductivity and pressure effects
Author
Faculty/Department
Faculty of Sciences. Physics
Publication type
conferenceObject
Publication
Dordrecht :Springer, [*]
Subject
Mathematics
Physics
Chemistry
Source (book)
NATO Advanced Research Workshop on Recent Trends in Theory of Physical Phenomena in High Magnetic Field, February 25-March 1, 2002, Les Houches, France
ISBN
1-4020-1372-8
ISI
000185641400004
Carrier
E
Target language
English (eng)
Affiliation
University of Antwerp
Abstract
We present a Ginzburg-Landau theory for a two-band superconductor with emphasis on MgB2. We propose experiments which lead to identification of the possible scenarios: whether both sigma- and pi-bands superconduct or sigma-alone. According to the second scenario a microscopic theory of superconducting MgB2 is proposed based on the strongly interacting or-electrons and non-correlated pi-electrons of boron ions. The kinematic and Coulomb interactions of sigma-electrons provide the superconducting state with an anisotropic gap of s(*)-wave symmetry. The critical temperature T-c has a non-monotonic dependence on the distance r between the centers of gravity of sigma- and pi-bands. The position of MgB2 on a bell-shaped curve T-c (r) is identified in the overdoped region. The derived superconducting density of electronic states is in agreement with available experimental and theoretical data. It is argued that the effects of pressure are crucial to identify the microscopic origin of superconductivity in MgB2. Possibilities for increase of T, are discussed.
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