Field-Induced Discommensuration in Charge Density Waves in o-TaS₃

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¹Division of Applied Physics, Graduate School of Engineering, Hokkaido University, Kita 13 Nishi 8, Kita-ku, Sapporo 060-8628²Graduate School of Natural Science and Technology, Okayama University, 3-1-1 Tsushima-naka, Okayama 700-8530³Japan Synchrotron Radiation Research Institute, 1-1-1 Koto, Sayo, Hyogo 679-5198

Received March 28, 2008; Accepted July 22, 2008; Published September 10, 2008

We report a synchrotron X-ray study of charge density waves (CDWs) in an o -TaS ₃ crystal. We found that two independent CDWs coexist in the temperature range of 130–50 K. These waves are incommensurate and commensurate CDWs with longitudinal wave vectors q _c=0.252 c ^* and 0.250 c ^*, respectively. The temperature and electric current dependences of the intensity of the two CDW satellites were measured. We found that the commensurate CDW was converted to the incommensurate CDW at 80 K by inducing current flow. Our observation was interpreted in terms of the dynamics of topological defects. We determined the edge dislocation configuration from the electric current dependence of the intensity of the two CDWs. The result implies for the first time that discommensurations are induced in the commensurate CDW by applying an electric field.

https://doi.org/10.1143/JPSJ.77.093708

KEYWORDS: charge density wave, o-TaS₃, discommensuration

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Field-Induced Discommensuration in Charge Density Waves in o-TaS3

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Field-Induced Discommensuration in Charge Density Waves in o-TaS₃