Gapped Ground State in the Spin-½ Trimer Chain System Cu3Cl6(H2O)2·2H8C4SO2

Mariko Ishii; Hidekazu Tanaka; Mikiko Hori; Hidehiro Uekusa; Yuji Ohashi; Keiji Tatani; Yasuo Narumi; Koichi Kindo

doi:10.1143/jpsj.69.340

Gapped Ground State in the Spin-½ Trimer Chain System Cu₃Cl₆(H₂O)₂·2H₈C₄SO₂

Mariko Ishii, Hidekazu Tanaka, Mikiko Hori, Hidehiro Uekusa, Yuji Ohashi, Keiji Tatani, Yasuo Narumi, Koichi Kindo

著者情報

Mariko Ishii
Department of Physics, Tokyo Institute of Technology, Meguro–ku, Tokyo 152–8551
Hidekazu Tanaka
Department of Physics, Tokyo Institute of Technology, Meguro–ku, Tokyo 152–8551
Mikiko Hori
Department of Physics, Tokyo Institute of Technology, Meguro–ku, Tokyo 152–8551
Hidehiro Uekusa
Department of Chemistry, Tokyo Institute of Technology, Meguro–ku, Tokyo 152–8551
Yuji Ohashi
Department of Chemistry, Tokyo Institute of Technology, Meguro–ku, Tokyo 152–8551
Keiji Tatani
Research Center for Materials Science at Extreme Conditions, Osaka University, Toyonaka, Osaka 560–0043
Yasuo Narumi
Research Center for Materials Science at Extreme Conditions, Osaka University, Toyonaka, Osaka 560–0043
CREST, Japan Science and Technology, Kawaguchi, Saitama 332–0012
Koichi Kindo
Research Center for Materials Science at Extreme Conditions, Osaka University, Toyonaka, Osaka 560–0043
CREST, Japan Science and Technology, Kawaguchi, Saitama 332–0012

キーワード: Cu₃Cl₆(H₂O)₂·2H₈C₄SO₂, trimer spin chain, singlet ground state, symmetry breaking, excitation gap, susceptibility, magnetization process

ジャーナル認証あり

2000 年 69 巻 2 号 p. 340-343

DOI https://doi.org/10.1143/jpsj.69.340

詳細

抄録

The magnetic susceptibility and magnetization curves of an S=½ trimer spin chain system Cu₃Cl₆(H₂O)₂·2H₈C₄SO₂ have been measured using single crystals and polycrystals. It was found that the ground state at zero-field is a spin singlet with an excitation gap. This result suggests that the translational symmetry of the Hamiltonian is spontaneously broken in the ground state. A model for the ground state is proposed. The magnetization curve measured at 0.08 K for polycrystals shows that the gap closes at H_c ≈ 3.9 T, from which the magnitude of the gap is evaluated as Δ /k_B≈5.2 K.

責任著者(Corresponding author)

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