Dopant-Bound Spinons in Cu(1-x)ZnxGeO3
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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