Experimental realization of a 2D fractional quantum spin liquid.

@article{Coldea2001ExperimentalRO,
  title={Experimental realization of a 2D fractional quantum spin liquid.},
  author={Radu Coldea and David A Tennant and Alexei M. Tsvelik and Zbigniew Tylczyński},
  journal={Physical review letters},
  year={2001},
  volume={86 7},
  pages={1335-8}
}
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. 

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