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基本情報 |
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氏名 |
稲垣 祐次 |
氏名(カナ) |
イナガキ ユウジ |
氏名(英語) |
Inagaki Yuji |
所属 |
機構 教育推進機構 基盤教育センター 科学技術教育部門 |
職名 |
准教授 |
researchmap研究者コード |
6000013935 |
researchmap機関 |
岡山理科大学 |
High-field ESR Spectroscopy of a Quantum Spin Liquid System CuHpCl
Yuji Inagaki, Takahiro Sakurai, Makoto Yoshida, Susumui Okubo, Hikomitsu Kikuchi, Keiichi Koyama and Hitoshi Ohta
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High-filed ESR measurements are performed on a single crystal of the spin gap system Cu2(C5H12N2)2Cl4 (CuHpCl). Observed ESR spectra at T = 1.7 K show beautiful hyperbolic anomalies at around 200 GHz and 300 GHz when estimated g-values are plotted as a function of the resonance frequency. The first anomaly point coincides with a critical magnetic field of Hc1 = 7.5 T (∼ 10 K) where the magnetization starts to increase due to softening of a triplet excitation branch into a singlet ground state, while the second one corresponds approximately to the higher energy excitation mode reported by the inelastic neutron measurement studies at around 1.2 meV (14 K or 10 T). Observed ESR modes at around Hc1 are explained by taking account of a small off-diagonal element, typically 0.45 K, which is probably coming from DM interaction, in the energy scheme with the singlet-triplet excitation gap of Δ/kB = 10.3 K. In addition, direct ESR transitions from the ground state to excited triplet states are observed. On the basis of these experimental facts, we discuss the nature of double spin excitations.
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