Scale-free antiferromagnetic fluctuations in the S=1/2 kagome antiferromagnet herbertsmithite

Details Scale-free antiferromagnetic fluctuations in the S=1/2 kagome antiferromagnet herbertsmithite Scale-free antiferromagnetic fluctuations in the S=1/2 kagome antiferromagnet herbertsmithite

2009-02-18

arxiv.org/abs/0902.3194v4

Phys. Rev. Lett. 103, 237201 (2009)

Physics

Condensed Matter

Strongly Correlated Electrons

Paper as published in Physics Review Letters. One figure with new data has been added and text has changed to improve clarity

Scientific paper

10.1103/PhysRevLett.103.237201

Neutron spectroscopy and diffuse neutron scattering on herbertsmithite [ZnCu3 (OH)6Cl2], a near-ideal realisation of the s = 1/2 kagome antiferromagnet, reveal the hallmark property of a quantum spin liquid; instantaneous short-ranged antiferromagnetic correlations in the absence of a time-averaged ordered moment. These dynamic antiferromagnetic correlations are only very weakly dependent of neutron-energy transfer and temperature, and persist up to 25 meV and 120 K. At low energy transfers a shift of the magnetic scattering to low Q is observed with increasing temperature, providing evidence of gapless spinons. It is argued that these observations provide important evidence in favour of RVB theories of (doped) Mott insulators.

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