Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
1996-12-18
Physica C, 274 (1997) 304
Physics
Condensed Matter
Strongly Correlated Electrons
9 pages Latex, 3 figures available upon request. To appear in Physica C
Scientific paper
10.1016/S0921-4534(96)00701-0
The issue of the spin gap in the magnetic susceptibility $\chi''(q,\omega)$ in high T_c superconductors is discussed within a scenario of a mixture of localized tightly bound electron pairs in singlet states (bi-polarons) and itinerant electrons. Due to a local exchange between the two species of charge carriers, antiferromagnetic correlations are induced amongst the itinerant electrons in the vicinity of the sites containing the bound electron pairs. As the temperature is lowered these exchange processes become spatially correlated leading to a spin wave-like spectrum in the subsystem of the itinerant electrons. The onset of such coherence is accompanied by the opening of a pseudo gap in the density of states of the electron subsystem whose temperature dependence is reflected in that of $\chi'' (q,\omega)$ near $q =(\pi,\pi)$ where a ``spin gap'' is observed by inelastic neutron scattering and NMR.
Ranninger Julius
Robin J.-M.
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