Magnetic Quantum Critical Point in YBa_2Cu_3O_{7-delta}? Resolving the Correlation Length Controversy

Details Magnetic Quantum Critical Point in YBa_2Cu_3O_{7-delta}? Resolving the Correlation Length Controversy Magnetic Quantum Critical Point in YBa_2Cu_3O_{7-delta}? Resolving the Correlation Length Controversy

2003-12-22

arxiv.org/abs/cond-mat/0312595v1

Physics

Condensed Matter

Superconductivity

4 eps figures, revtex

Scientific paper

A mode coupling calculation which previously explained the Mott gap collapse induced in cuprates by electron doping is applied to the analogous problem of hole doping. A plateau in the q-space susceptibility is found to inhibit the rate of susceptibility divergence as T goes to 0. This effect could reconcile neutron and NMR measurements of the correlation length in this regime, and clarify the issue of proximity to a quantum critical point.

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