TY - JOUR
T1 - Neutron-scattering measurement of incommensurate short-range order in single crystals of the S=1 triangular antiferromagnet NiGa2S 4
AU - Stock, C.
AU - Jonas, S.
AU - Broholm, C.
AU - Nakatsuji, S.
AU - Nambu, Y.
AU - Onuma, K.
AU - Maeno, Y.
AU - Chung, J. H.
PY - 2010/7/16
Y1 - 2010/7/16
N2 - Neutron scattering is used to investigate spin correlations in ultrapure single crystals of the S=1 triangular lattice NiGa2S4. Despite a Curie-Weiss temperature of ΘCW=-80(2)K, static (τ>1ns) short-range (ξab=26(3)Å) incommensurate order prevails for T>1.5K. The incommensurate modulation Q0=(0.155(3),0.155(3),0), ΘCW, and the spin-wave velocity (c=4400m/s) can be accounted for by antiferromagnetic third-nearest-neighbor interactions J3=2.8(6)meV and ferromagnetic nearest-neighbor coupling J1=-0.35(9) J3. Interplane correlations are limited to nearest neighbors and weakened by an in-plane field. These observations show that the short-range ordered glassy phase that has been observed in a number of highly degenerate systems can persist near the clean limit.
AB - Neutron scattering is used to investigate spin correlations in ultrapure single crystals of the S=1 triangular lattice NiGa2S4. Despite a Curie-Weiss temperature of ΘCW=-80(2)K, static (τ>1ns) short-range (ξab=26(3)Å) incommensurate order prevails for T>1.5K. The incommensurate modulation Q0=(0.155(3),0.155(3),0), ΘCW, and the spin-wave velocity (c=4400m/s) can be accounted for by antiferromagnetic third-nearest-neighbor interactions J3=2.8(6)meV and ferromagnetic nearest-neighbor coupling J1=-0.35(9) J3. Interplane correlations are limited to nearest neighbors and weakened by an in-plane field. These observations show that the short-range ordered glassy phase that has been observed in a number of highly degenerate systems can persist near the clean limit.
UR - http://www.scopus.com/inward/record.url?scp=77954821230&partnerID=8YFLogxK
U2 - 10.1103/PhysRevLett.105.037402
DO - 10.1103/PhysRevLett.105.037402
M3 - Article
AN - SCOPUS:77954821230
SN - 0031-9007
VL - 105
JO - Physical Review Letters
JF - Physical Review Letters
IS - 3
M1 - 037402
ER -