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Published on: March 30, 2017
Freezing of a Disorder Induced Spin Liquid with Strong Quantum Fluctuations
Xiao Hu1, Daniel M Pajerowski2, Depei Zhang1
1Department of Physics, University of Virginia, Charlottesville, Virginia 22904, USA.
None:
Sr_{2}CuTe_{0.5}W_{0.5}O_{6} is a square-lattice magnet with superexchange between S=1/2Cu^{2+} spins mediated by randomly distributed Te and W ions. Here, using sub-K temperature and 20 microeV energy resolution neutron scattering experiments we show that this system transits from a gapless disorder-induced spin liquid to a new quantum state below T_{f}=1.7(1) K, exhibiting a weak frozen moment of ⟨S⟩/S∼0.1 and low energy dynamic susceptibility, χ^{''}(ℏω), linear in energy which is surprising for such a weak freezing in this highly fluctuating quantum regime.
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