Title
Electron or hole liquids in high-<tex>$T_{c}$</tex> cuprates : evidence for d-wave order parameter Electron or hole liquids in high-<tex>$T_{c}$</tex> cuprates : evidence for d-wave order parameter
Author
Faculty/Department
Faculty of Sciences. Physics
Publication type
article
Publication
London ,
Subject
Physics
Chemistry
Source (journal)
Physics and chemistry of liquids. - London
Volume/pages
41(2003) :6 , p. 559-566
ISSN
0031-9104
ISI
000187495400002
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
Phillips and Jung [J.C. Phillips and J. Jung (2002). Phil. Mag. B, 82, 1163] refute nodal properties of the gap function Delta(k) and propose an isotropic s-wave picture with electron-phonon interaction as the mechanism for high-T-c superconductivity in the cuprates. Here, we compare and contrast predictions of various physical properties with the gap function Delta(k) reflecting three scenarios: (i) isotropic s-wave pairing, (ii) extended s-wave with eight line nodes as championed quite recently by Zhao [G.M. Zhao (2001). Phys. Rev. B, 64, 024503], and (iii) d-wave pairing. By referring to (a) scanning tunnelling microscopy imaging of a Zn impurity, supported by our own subsequent theoretical study, (b) linear decrease of T-c with non-magnetic impurity concentration, and (c) calculations on the extended s-wave scenario applied to tunnelling conductance, strong evidence for nodal properties of Delta(k) is given. The contentions of Phillips and Jung [J.C. Phillips and J. Jung (2002). Phil. Mag. B, 82, 1163] should therefore be treated with considerable caution, isotropic s-wave behaviour being truly exceptional among the high-T-c cuprates.
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