Quantum Disordered Regime and Spin Gap in the Cuprate Superconductors

Details Quantum Disordered Regime and Spin Gap in the Cuprate Superconductors Quantum Disordered Regime and Spin Gap in the Cuprate Superconductors

1993-07-08

arxiv.org/abs/cond-mat/9307014v1

Physical Review B 49, 1544 (1994)

Physics

Condensed Matter

14 pages, REVTeX v3.0, PostScript file for 3 figures is attached, UIUC-P-93-07-065

Scientific paper

10.1103/PhysRevB.49.1544

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 $\Delta\!\sim\!1/\xi$ 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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