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

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29 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)545-548
Number of pages4
JournalPhysica B: Condensed Matter
Volume246-247
DOIs
Publication statusPublished - May 29 1998

Keywords

  • Double spin chain
  • ESR
  • Excitation gap
  • High magnetic field
  • KCuCl
  • Singlet ground state
  • TlCuCl

ASJC Scopus subject areas

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

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    Tanaka, H., Takatsu, T., Shiramura, W., Kambe, T., Nojiri, H., Yamada, T., Okubo, S., Ohta, H., & Motokawa, M. (1998). High-frequency high-field ESR of quantum double spin chain systems KCuCl3 and TlCuCl3. Physica B: Condensed Matter, 246-247, 545-548. https://doi.org/10.1016/S0921-4526(97)00982-4