Experimental realization of a 2D fractional quantum spin liquid
arXiv:cond-mat/0007172 · doi:10.1103/PhysRevLett.86.1335
Abstract
The ground-state ordering and dynamics of the two-dimensional (2D) S=1/2 frustrated Heisenberg antiferromagnet Cs_2CuCl_4 is explored using neutron scattering in high magnetic fields. We find that the dynamic correlations show a highly dispersive continuum of excited states, characteristic of the RVB state, arising from pairs of S=1/2 spinons. Quantum renormalization factors for the excitation energies (1.65) and incommensuration (0.56) are large.
4 pages revtex, 3 ps figures, new data added to fig. 1f, includes referees' comments