title: Spin disorder on a triangular lattice.
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.
authors.affiliation: Department of Physics, Kyoto University, Kyoto 606-8502, Japan. nakatsuji@scphys.kyoto-u.ac.jp
authors.forename: Satoru
authors.initials: S
authors.lastname: Nakatsuji
authors.forename: Yusuke
authors.initials: Y
authors.lastname: Nambu
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Tonomura
authors.forename: Osamu
authors.initials: O
authors.lastname: Sakai
authors.forename: Seth
authors.initials: S
authors.lastname: Jonas
authors.forename: Collin
authors.initials: C
authors.lastname: Broholm
authors.forename: Hirokazu
authors.initials: H
authors.lastname: Tsunetsugu
authors.forename: Yiming
authors.initials: Y
authors.lastname: Qiu
authors.forename: Yoshiteru
authors.initials: Y
authors.lastname: Maeno