Commensurate-incommensurate transition of charge density waves in o-TaS3

K. Inagaki, M. Tsubota, K. Ichimura, S. Tanda, K. Yamamoto, N. Hanasaki, Yoshio Nogami, Naoshi Ikeda, T. Ito, H. Toyokawa

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

We report a synchrotron X-ray study of charge density waves (CDWs) in an o-TaS3 crystal. CDW of o-TaS3 has been known to undergo a commensurate-incommensurate transition at 100 K, below which the wavevector locks in with the pristine lattice. However, the details of the commensurate-incommensurate transition remain open problems, the example being whether the discommensuration exists or not in the neighborhood of the transition. We exploited the beamline BL02B1 of SPring-8. A two-dimensional detector was placed at a distance of 1300 mm from the sample, providing an angle resolution of 0.0076°. Temperature dependence of the Bragg peak (0 0 2) and satellite peak (1 - 1 2) + q was measured from 7 to 180 K. We found that a new phase in the temperature range of 130-50 K, where two independent CDWs coexist. These waves are incommensurate and commensurate CDWs with longitudinal wave vectors qc = 0.252 c* and 0.250 c*, respectively. By lowering the temperature, intensity of the incommensurate CDW was decreased, while that of the commensurate CDW was increased. Below 50 K, the incommensurate CDW was completely diminished. Based on the concept of discommensuration, we suggested the dislocation configuration from the intensity of the two CDWs.

Original languageEnglish
Pages (from-to)396-398
Number of pages3
JournalPhysica B: Condensed Matter
Volume404
Issue number3-4
DOIs
Publication statusPublished - 2009

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Charge density waves
Synchrotrons
longitudinal waves
Temperature
synchrotrons
Satellites
Detectors
X rays
Crystals
temperature dependence
temperature

ASJC Scopus subject areas

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

Cite this

Inagaki, K., Tsubota, M., Ichimura, K., Tanda, S., Yamamoto, K., Hanasaki, N., ... Toyokawa, H. (2009). Commensurate-incommensurate transition of charge density waves in o-TaS3. Physica B: Condensed Matter, 404(3-4), 396-398. https://doi.org/10.1016/j.physb.2008.11.017

Commensurate-incommensurate transition of charge density waves in o-TaS3. / Inagaki, K.; Tsubota, M.; Ichimura, K.; Tanda, S.; Yamamoto, K.; Hanasaki, N.; Nogami, Yoshio; Ikeda, Naoshi; Ito, T.; Toyokawa, H.

In: Physica B: Condensed Matter, Vol. 404, No. 3-4, 2009, p. 396-398.

Research output: Contribution to journalArticle

Inagaki, K, Tsubota, M, Ichimura, K, Tanda, S, Yamamoto, K, Hanasaki, N, Nogami, Y, Ikeda, N, Ito, T & Toyokawa, H 2009, 'Commensurate-incommensurate transition of charge density waves in o-TaS3', Physica B: Condensed Matter, vol. 404, no. 3-4, pp. 396-398. https://doi.org/10.1016/j.physb.2008.11.017
Inagaki K, Tsubota M, Ichimura K, Tanda S, Yamamoto K, Hanasaki N et al. Commensurate-incommensurate transition of charge density waves in o-TaS3. Physica B: Condensed Matter. 2009;404(3-4):396-398. https://doi.org/10.1016/j.physb.2008.11.017
Inagaki, K. ; Tsubota, M. ; Ichimura, K. ; Tanda, S. ; Yamamoto, K. ; Hanasaki, N. ; Nogami, Yoshio ; Ikeda, Naoshi ; Ito, T. ; Toyokawa, H. / Commensurate-incommensurate transition of charge density waves in o-TaS3. In: Physica B: Condensed Matter. 2009 ; Vol. 404, No. 3-4. pp. 396-398.
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AB - We report a synchrotron X-ray study of charge density waves (CDWs) in an o-TaS3 crystal. CDW of o-TaS3 has been known to undergo a commensurate-incommensurate transition at 100 K, below which the wavevector locks in with the pristine lattice. However, the details of the commensurate-incommensurate transition remain open problems, the example being whether the discommensuration exists or not in the neighborhood of the transition. We exploited the beamline BL02B1 of SPring-8. A two-dimensional detector was placed at a distance of 1300 mm from the sample, providing an angle resolution of 0.0076°. Temperature dependence of the Bragg peak (0 0 2) and satellite peak (1 - 1 2) + q was measured from 7 to 180 K. We found that a new phase in the temperature range of 130-50 K, where two independent CDWs coexist. These waves are incommensurate and commensurate CDWs with longitudinal wave vectors qc = 0.252 c* and 0.250 c*, respectively. By lowering the temperature, intensity of the incommensurate CDW was decreased, while that of the commensurate CDW was increased. Below 50 K, the incommensurate CDW was completely diminished. Based on the concept of discommensuration, we suggested the dislocation configuration from the intensity of the two CDWs.

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