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

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

Research output: Contribution to journal › Article

28 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
Publication statusPublished - May 29 1998

Fingerprint

Ground state
Paramagnetic resonance
Electron transitions
Excited states
atomic energy levels
ground state
excitation
Helium
Excitation energy
Ladders
ladders
tendencies
frequency ranges
helium
interactions
Temperature
temperature
energy

Keywords

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

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

Cite this

Tanaka, H., Takatsu, T., Shiramura, W., Kambe, T., Nojiri, H., Yamada, T., ... 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.

High-frequency high-field ESR of quantum double spin chain systems KCuCl3 and TlCuCl3. / Tanaka, H.; Takatsu, T.; Shiramura, W.; Kambe, Takashi; Nojiri, H.; Yamada, T.; Okubo, S.; Ohta, H.; Motokawa, M.

In: Physica B: Condensed Matter, Vol. 246-247, 29.05.1998, p. 545-548.

Research output: Contribution to journal › Article

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, vol. 246-247, pp. 545-548.
Tanaka H, Takatsu T, Shiramura W, Kambe T, Nojiri H, Yamada T et al. High-frequency high-field ESR of quantum double spin chain systems KCuCl3 and TlCuCl3. Physica B: Condensed Matter. 1998 May 29;246-247:545-548.
Tanaka, H. ; Takatsu, T. ; Shiramura, W. ; Kambe, Takashi ; Nojiri, H. ; Yamada, T. ; Okubo, S. ; Ohta, H. ; Motokawa, M. / High-frequency high-field ESR of quantum double spin chain systems KCuCl3 and TlCuCl3. In: Physica B: Condensed Matter. 1998 ; Vol. 246-247. pp. 545-548.
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AU - Nojiri, H.

AU - Yamada, T.

AU - Okubo, S.

AU - Ohta, H.

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N2 - 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.

AB - 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.

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