Dopant-Bound Spinons in Cu_(1-x)Zn_xGeO_3

Details Dopant-Bound Spinons in Cu_(1-x)Zn_xGeO_3 Dopant-Bound Spinons in Cu_(1-x)Zn_xGeO_3

1998-08-06

arxiv.org/abs/cond-mat/9808064v1

Europhys. Lett. 43, 463 (1998)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, Latex with 3 figures, including EPL style files, Eur. Phys. Lett. in press

Scientific paper

10.1209/epl/i1998-00382-3

Polarized inelastic light scattering experiments on Cu_(1-x)Zn_xGeO_3 (0<= x <= 0.045) single crystals show for x<>0 a new distinct mode at nearly half the energy of the singlet response below the spin-Peierls transition. The temperature, magnetic field, polarization, and doping dependencies of this mode are similar to those of the singlet bound state. The data are interpreted in terms of a spinon-assisted light scattering process. Position and form of the peak provide strong evidence for the presence of dopant-bound spinons in Cu_(1-x)Zn_xGeO_3.

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