Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2012-03-10
New J. Phys. 13 093029 (2011)
Physics
Condensed Matter
Strongly Correlated Electrons
14 pages, 8 figures
Scientific paper
We report nuclear magnetic resonance measurements of the spin-1/2 anisotropic triangular lattice antiferromagnet Cs$_2$CuCl$_4$ as a function of temperature and applied magnetic field. The observed temperature and magnetic field dependence of the NMR relaxation rate suggests that low energy excitations in the short-range ordered region stabilized over a wide range of intermediate fields and temperatures of the phase diagram are gapless or nearly gapless fermionic excitations. An upper bound on the size of the gap of 0.037 meV $\approx J/10$ is established. The magnetization and NMR relaxation rate can be qualitatively described either by a quasi-1D picture of weakly coupled chains, or by mean-field theories of specific 2D spin liquids; however, quantitative differences exist between data and theory in both cases. This comparison indicates that 2D interactions are quantitatively important in describing the low-energy physics.
Coldea Radu
Koutroulakis G.
Kuhns P.
Ma Ookie
Marston J. . B.
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