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Title
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Electron or hole liquids in high- cuprates : evidence for d-wave order parameter
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Author
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Abstract
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| 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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Language
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English
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Source (journal)
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Physics and chemistry of liquids. - London
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Publication
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London
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2003
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ISSN
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0031-9104
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DOI
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10.1080/00319100310001596416
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Volume/pages
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41
:6
(2003)
, p. 559-566
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ISI
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000187495400002
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Full text (Publisher's DOI)
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