Journal
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
Volume 79, Issue 1, Pages -Publisher
PHYSICAL SOC JAPAN
DOI: 10.1143/JPSJ.79.011003
Keywords
triangular lattice; NiGa2S4; vector spin chirality; spin quadrupole moment; critical slowing down; viscous spin liquid; spin nematic; C-3 bond-order
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Funding
- Japan Society for the Promotion of Science (JSPS) [21684019, 21740275]
- Ministry of Education, Culture, Sports, Science and Technology, Japan (MEXT) [17071003, 19052003, 20029006, 20046016]
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Geometrical frustration may Suppress conventional magnetic long-range order and possibly promote a novel type of ordering associated with a higher order degree of freedom than spin dipolar-moment such as vector spin chirality and spin quadrupole moment. After a brief overview of such phenomena due to vector spin chirality, we focus on the two-dimensional (2D) frustrated magnetism in the layered chalcogenide Mott insulator NiGa2S4 and related compounds. NiGa2S4 provides the unique example of a S = 1 2D antiferromagnet on a regular exact triangular lattice. Extensive studies using high-purity samples of NiGa2S4 have revealed that Ni2+ S = 1 Heisenberg spins exhibit resonant critical slowing down at T* = 8.5 K without forming a magnetic long-range order, Signaling a viscous spin-liquid state. The critical spin-fluctuation regime extends over almost all order of magnitude in temperature both above and below T*. Even well below T*, the spin-spin correlation remains short-ranged at an incommensurate wave vector close to (1/6, 1/6,0), corresponding to a 120 degrees correlation with 2a period. Interestingly, however, a 2D linearly dispersive magnetic mode and a quasi-static spin component exist in the low temperature limit. Possibly relevant scenarios including topological phase transition associated with Z(2) vortex due to vector spin chirality, Spill quadrupolar nematic correlation, and C-3 bond-ordering are reviewed.
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