Experimental realization of a 2D fractional quantum spin liquid.
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.
Coldea
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Oak Ridge National Laboratory, Oak Ridge, Tennesse 37831, USA.
Tennant
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Tsvelik
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Tylczynski
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