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Critical Doping in Overdoped High‐ T c Superconductors: a Quantum Critical Point?
Author(s) -
Tallon J. L.,
Loram J. W.,
Williams G. V. M.,
Cooper J. R.,
Fisher I. R.,
Johnson J. D.,
Staines M. P.,
Bernhard C.
Publication year - 1999
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/(sici)1521-3951(199909)215:1<531::aid-pssb531>3.0.co;2-w
Subject(s) - condensed matter physics , quantum critical point , pseudogap , superconductivity , superfluidity , critical point (mathematics) , physics , doping , knight shift , critical exponent , scaling , quantum phase transition , phase transition , cuprate , mathematical analysis , mathematics , geometry
Evidence is presented from the scaling of the Knight shift, entropy and transport properties together with the sharp peaking of condensation energy, critical currents, superfluid density and a variety of other physical properties for the occurrence of a common critical doping point in lightly overdoped high‐ T c superconductors (HTS). This critical doping lies at the point where the doping‐dependent normal‐state pseudogap energy, E g , falls to zero and bears a strong, though incomplete, resemblance to a quantum critical point (QCP). A QCP scenario could lead directly to an explanation of the non‐Fermi liquid behaviour of the normal‐state metallic phase and the overall generic behaviour of the HTSC.