Abstract
The temperature dependence of magnetic susceptibility, χ( T ), of the P 2 1 / m crystal of a novel [Pd(dmit) 2 ] salt, (C 2 H 5 )(CH 3 ) 3 P[Pd(dmit) 2 ] 2 , has been measured. The observed χ( T ) above 30 K is reproduced by the model of a spin-1/2 Heisenberg antiferromagnet on a triangular lattice with the exchange coupling, J / k B = 250 K. A phase transition at 25 K 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.
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