Frustration-Induced Valence-Bond Ordering in a New Quantum Triangular Antiferromagnet Based on [Pd(dmit)_2](Condensed matter: electronic structure and electrical, magnetic, and optical properties)
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概要
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The temperature dependence of magnetic susceptibility, χ(T), of the P2_1/m crystal of a novel [Pd(dmit)_2] salt, (C_2H_5) (CH_3)_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/k_B=250K. 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.
- 社団法人日本物理学会の論文
- 2006-09-15
著者
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Kato Reizo
Condensed Molecular Materials Lab.
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Tamura Masafumi
Condensed Molecular Materials Lab.
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Nakao Akiko
Condensed Matter Research Cente Photon Factory Imss Kek
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Nakao Akiko
Condensed Molecular Materials Lab.:(present Address) Institute Of Materials Structure Science
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