Dopant-Bound Spinons in Cu(1-x)ZnxGeO3
G. Els, G. S. Uhrig, P. Lemmens, H. Vonberg, P. H. M. van Loosdrecht, G. Guentherodt, O. Fujita, J. Akimitsu, G. Dhalenne, A. Revcolevschi
Abstract
Polarized inelastic light scattering experiments on Cu(1-x)ZnxGeO3 (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)ZnxGeO3.
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