Is MgB 2 a BCS-like charged superfluid?

Authors: Angilella, G. G. N.¹; March, N. H.²; Pucci, R.¹

Source: Physics and Chemistry of Liquids, Volume 44, Number 2, April 2006 , pp. 213-216(4)

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Abstract:

Two complementary mechanisms have been proposed for relatively high temperature superconductor MgB 2 . While the first is the electron–phonon mechanism of BCS theory, advocated strongly by Pickett and co-workers, the second, by Bianconi et al ., invokes Feshbach shape resonances. While we cannot presently discount the second mechanism, and while both proposals exploit the multiband nature of the electronic structure of MgB 2 , we show here that five body-centred cubic (bcc) transition metals, whose superconducting transition temperature correlate intimately with elastic constants and therefore are plainly BCS-like in character, lie on a curve which has MgB 2 at the high T c end. Any alternative mechanism to electron–phonon interaction in MgB 2 will need to account quantitatively for this circumstance.

Keywords: Electron–phonon mechanism; Superfluid MgB 2

Document Type: Research article

DOI: http://dx.doi.org/10.1080/00319100600644052

Affiliations: 1: Dipartimento di Fisica e Astronomia, Università di Catania, and CNR-INFM-MATIS, and CNISM, UdR Catania, and INFN, Sez. Catania, Via S. Sofia, 64, I-95123 Catania, Italy 2: Department of Physics, University of Antwerp, Groenenborgerlaan 171, B-2020 Antwerp, Belgium

Publication date: 2006-04-01