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Experimental realization of a 2D fractional quantum spin liquid
R Coldea1, D A Tennant, A M Tsvelik
1Oak Ridge National Laboratory, Oak Ridge, Tennesse 37831, USA.
Physical Review Letters
|February 15, 2001
Abstract:
The ground-state ordering and dynamics of the two-dimensional S = 1/2 frustrated Heisenberg antiferromagnet Cs(2)CuCl(4) are 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 resonating valence bond state, arising from pairs of S = 1/2 spinons. Quantum renormalization factors for the excitation energies (1.65) and incommensuration (0.56) are large.