Experimental realization of a 2D fractional quantum spin liquid

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

References in corpus (7)

• Dynamics of coupled quantum spin chains
• A Novel Longitudinal Mode in the Coupled Quantum Chain Compound KCuF3
• Quasi-1D spin-1/2 Heisenberg magnets in their ordered phase: correlation functions
• The Quasi-1D S=1/2 Antiferromagnet Cs2CuCl4 in a Magnetic Field
• The fate of spinons in spontaneously dimerised spin-1/2 ladders
• Transition from Haldane Phase to Spin Liquid and Incommensurate Correlation in Spin-1/2 Heisenberg Chains
• Dynamical T=0 correlations of the S=1/2 1D Heisenberg Anti-Ferromagnet with 1/r^2 exchange in a magnetic field

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