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19 July 2018
  » arxiv » cond-mat/0311467

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The Physics Behind High-Temperature Superconducting Cuprates: The "Plain Vanilla" Version Of RVB
P. W. Anderson ; P. A. Lee ; M. Randeria ; T. M. Rice ; N. Trivedi ; F. C. Zhang ;
Rating Members: 1.25/5 (1 reader) | Visitors: 1/5 (1 visitor)
Date 19 Nov 2003
Journal J Phys. Condens. Matter 16 (2004) R755-R769
Subject Strongly Correlated Electrons; Superconductivity | cond-mat.str-el cond-mat.supr-con
AbstractOne of the first theoretical proposals for understanding high temperature superconductivity in the cuprates was Anderson’s RVB theory using a Gutzwiller projected BCS wave function as an approximate ground state. Recent work by Paramekanti, Randeria and Trivedi has shown that this variational approach gives a semi-quantitative understanding of the doping dependences of a variety of experimental observables in the superconducting state of the cuprates. In this paper we revisit these issues using the ``renormalized mean field theory’’ of Zhang, Gros, Rice and Shiba based on the Gutzwiller approximation in which the kinetic and superexchange energies are renormalized by different doping-dependent factors $g_{t}$ and $g_{S}$ respectively. We point out a number of consequences of this early mean field theory for experimental measurements which were not available when it was first explored, and observe that it is able to explain the existence of the pseudogap, properties of nodal quasiparticles and approximate spin-charge separation, the latter leading to large renormalizations of the Drude weight and superfluid density. We use the Lee-Wen theory of the phase transition as caused by thermal excitation of nodal quasiparticles, and also obtain a number of further experimental confirmations. Finally, we remark that superexchange, and not phonons, are responsible for d-wave superconductivity in the cuprates.
Source arXiv, cond-mat/0311467
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1. review 05090020 (1 reader)    * Rate this comment.
Review title: Why always the same story?
Reviewer: reviewer20
Date: 23 September 2005 at 14:16 GMT.
Comment: The authors claims that they can explain the pseudogap phase using their simple theory. I see two problems: they have NO quantitative results, just assumptions, and second, if they only propose a mean-field theory. I hardly believe that a zero temperature theory can be extended at 300 K or 500 K in the pseudogap phase.
The most significant critic has been pointed out in this paper
Indeed, the authors seems to ignore the experimental phase diagram that has been obtained by many groups: there are two transitions lines in the pseudogap phase, one is T* the transition for the pseudogap itself, and the second one is the transition T' which is believe to be a vortex transition or the point where phases start to be correlated.

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