TY - JOUR
T1 - Frustration-induced valence-bond ordering in a new quantum triangular antiferromagnet based on [Pd(dmit)2]
AU - Tamura, Masafumi
AU - Nakao, Akiko
AU - Kato, Reizo
N1 - Copyright:
Copyright 2011 Elsevier B.V., All rights reserved.
PY - 2006/9
Y1 - 2006/9
N2 - The temperature dependence of magnetic susceptibility, χ(T), of the P21/m crystal of a novel [Pd(dmit)2] salt, (C 2H5)(CH3)3P[Pd(dmit) 2]2, has been measured. The observed χ(T) above 30K is reproduced by the model of a spin-1/2 Heisenberg antiferromagnet on a triangular lattice with the exchange coupling, J/kB = 250 K. A phase transition at 25K to a spin-gapped state has been found. As well as a spin-Peierls transition, this transition breaks the translational symmetry, leading to the formation of a columnar arrangement of the spin-singlet pairs. A significant role of the lattice structure in stabilizing the spin-singlet ordering is pointed out. To our knowledge, this is the first report of a two-dimensional (2D) spin system exhibiting a spin-Peierls-like transition.
AB - The temperature dependence of magnetic susceptibility, χ(T), of the P21/m crystal of a novel [Pd(dmit)2] salt, (C 2H5)(CH3)3P[Pd(dmit) 2]2, has been measured. The observed χ(T) above 30K is reproduced by the model of a spin-1/2 Heisenberg antiferromagnet on a triangular lattice with the exchange coupling, J/kB = 250 K. A phase transition at 25K to a spin-gapped state has been found. As well as a spin-Peierls transition, this transition breaks the translational symmetry, leading to the formation of a columnar arrangement of the spin-singlet pairs. A significant role of the lattice structure in stabilizing the spin-singlet ordering is pointed out. To our knowledge, this is the first report of a two-dimensional (2D) spin system exhibiting a spin-Peierls-like transition.
KW - Magnetic susceptibility
KW - Pd(dmit)
KW - Spin-Peierls transition
KW - Valence bond order
KW - X-ray crystal structure
UR - http://www.scopus.com/inward/record.url?scp=33847303188&partnerID=8YFLogxK
U2 - 10.1143/JPSJ.75.093701
DO - 10.1143/JPSJ.75.093701
M3 - Article
AN - SCOPUS:33847303188
SN - 0031-9015
VL - 75
JO - journal of the physical society of japan
JF - journal of the physical society of japan
IS - 9
M1 - 093701
ER -