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Saddle-point van Hove singularity and the phase diagram of high-Tc cuprates

J. G. Storey, J. L. Tallon, and G. V. M. Williams
Phys. Rev. B 76, 174522 – Published 28 November 2007
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    Abstract

    We examine the generic phase behavior of high-Tc cuprate superconductors in terms of a universal van Hove singularity in the strongly overdoped region. Using a dispersion derived from angle-resolved photoemission spectroscopy (ARPES), we solve the BCS gap equation and show that the pairing interaction or pairing energy cutoff must be a rapidly declining function of doping. This result is prejudicial to a phonon-based pairing interaction and more consistent with a magnetic or magnetically enhanced interaction.

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    • Received 13 July 2007

    DOI:https://doi.org/10.1103/PhysRevB.76.174522

    ©2007 American Physical Society

    Authors & Affiliations

    J. G. Storey1, J. L. Tallon1,2, and G. V. M. Williams2

    • 1School of Chemical and Physical Sciences, Victoria University, P.O. Box 600, Wellington, New Zealand
    • 2MacDiarmid Institute for Advanced Materials and Nanotechnology, Industrial Research Ltd., P.O. Box 31310, Lower Hutt, New Zealand

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    Issue

    Vol. 76, Iss. 17 — 1 November 2007

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    • Figure 1
      Figure 1
      (Color online) (a) The doping dependence of the DOS N(EF) and of Tc, as observed (squares) and as calculated (triangles) assuming a constant pairing interaction. (b) The doping dependence of the pairing amplitude V and of the exchange energy J, the pseudogap energy Eg, the NMR wipeout line kBTwo, and Néel line kBTN.Reuse & Permissions
    • Figure 2
      Figure 2
      The Y89 Knight shift for Y0.8Ca0.2Ba2Cu3O7−δ at the indicated p values. Solid curves are the fits using a two-band dispersion, as described in the text. The inset shows the deduced values of the pseudogap energy Eg and of EF−EvHs showing that the vHs is crossed in the deeply overdoped region.Reuse & Permissions
    • Figure 3
      Figure 3
      (Color online) (a) Transition temperatures of different cuprates calculated from their respective ARPES dispersions assuming an identical pairing potential as a function of EF−EvHs. (b) Comparison of the densities of states and a plot of the pairing potential used in (a).Reuse & Permissions
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