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Quantum Disordered Regime and Spin Gap in the Cuprate Superconductors

V. Barzykin·D. Pines·A. Sokol·D. Thelen
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Abstract

We discuss the crossover from the quantum critical, $z\!=\!1$, to the quantum disordered regime in high-T$_c$ materials in relation to the experimental data on the nuclear relaxation, bulk susceptibility, and inelastic neutron scattering. In our scenario, the spin excitations develop a gap $Δ\!\sim\!1/ξ$ well above T$_c$, which is supplemented by the quasiparticle gap below T$_c$. The above experiments yield consistent estimates for the value of the spin gap, which increases as the correlation length decreases.

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V. Barzykin, D. Pines, A. Sokol, D. Thelen. 1993-07-08. Quantum Disordered Regime and Spin Gap in the Cuprate Superconductors. https://doi.org/10.1103/physrevb.49.1544

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