Spin disorder on a triangular lattice |
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Authors: | Nakatsuji Satoru Nambu Yusuke Tonomura Hiroshi Sakai Osamu Jonas Seth Broholm Collin Tsunetsugu Hirokazu Qiu Yiming Maeno Yoshiteru |
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Institution: | Department of Physics, Kyoto University, Kyoto 606-8502, Japan. nakatsuji@scphys.kyoto-u.ac.jp |
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Abstract: | As liquids crystallize into solids on cooling, spins in magnets generally form periodic order. However, three decades ago, it was theoretically proposed that spins on a triangular lattice form a liquidlike disordered state at low temperatures. Whether or not a spin liquid is stabilized by geometrical frustration has remained an active point of inquiry ever since. Our thermodynamic and neutron measurements on NiGa2S4, a rare example of a two-dimensional triangular lattice antiferromagnet, demonstrate that geometrical frustration stabilizes a low-temperature spin-disordered state with coherence beyond the two-spin correlation length. Spin liquid formation may be an origin of such behavior. |
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