Quantum Spin Systems: From Spin Gaps to Pseudo Gaps

Details Quantum Spin Systems: From Spin Gaps to Pseudo Gaps Quantum Spin Systems: From Spin Gaps to Pseudo Gaps

1999-10-06

arxiv.org/abs/cond-mat/9910074v1

Advances in Solid State Physics Vol. 39, Vieweg Braunschweig 1999, p. 281-290

Physics

Condensed Matter

Strongly Correlated Electrons

10 pages, 5 figures

Scientific paper

10.1007/BFb0107486

Many low dimensional spin systems with a dimerized or ladder-like antiferromagnetic exchange coupling have a gapped excitation spectrum with magnetic bound states within the spin gap. For spin ladders with an even number of legs the existence of spin gaps and within the t-J model a tendency toward superconductivity with d-wave symmetry is predicted. In the following we will characterize the spin excitation spectra of different low dimensional spin systems taking into account strong spin phonon interaction ($\rm CuGeO_3$), charge ordering ($\rm NaV_2O_5$) and doping on chains and ladders (\ladder). The spectroscopic characterization of the model systems mentioned above has been performed using magnetic inelastic light scattering originating from a spin conserving exchange scattering mechanism. This is also bound to yield more insight into the interrelation between these spin gap excitations and the origin of the pseudo gap in high temperature superconductors.

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