High-frequency high-field ESR of quantum double spin chain systems KCuCl3 and TlCuCl3

H. Tanaka, T. Takatsu, W. Shiramura, T. Kambe, H. Nojiri, T. Yamada, S. Okubo, H. Ohta, M. Motokawa

研究成果: Article査読

30 被引用数 (Scopus)

抄録

ESR measurements have been performed on KCuCl3 and TlCuCl3 in the frequency range up to 762 GHz and field range up to 30 T at helium temperatures. The exchange network in the present systems is described as an S = 1/2 Heisenberg spin ladder along the a-axis with an additional diagonal interaction. Both compounds have a singlet ground state with an excitation gap. In KCuCl3, two kinds of transitions are observed between the ground state and the excited triplet states. They correspond to the excitations at Q = (1,0,1) and (0.5,0,1) with the excitation energies Δ ≈ 640 and 1080 GHz, respectively. When the external field is increased, the frequency of the lowest branch with the zero-field gap Δ ≈ 640 GHz decreases linearly with a tendency toward zero at Hc ≈ 22 T. In TlCuCl3, a transition from the singlet ground state to the excited triplet state is observed. The zero-field gap is determined as Δ ≈ 160 GHz.

本文言語English
ページ(範囲)545-548
ページ数4
ジャーナルPhysica B: Condensed Matter
246-247
DOI
出版ステータスPublished - 1998 5 29

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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