Publication Type
Journal
Journal Name
Physical Review Letters
Publication Date
Page Number
017201
Volume
127
Issue
1
Abstract
Sr2CuTe0.5W0.5O6 is a square-lattice magnet with superexchange between S=12Cu2+ spins mediated by randomly distributed Te and W ions. Here, using sub-K temperature and 20 μeV energy resolution neutron scattering experiments we show that this system transits from a gapless disorder-induced spin liquid to a new quantum state below Tf=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.
