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arXiv · 1405.5561

Experimental evidence for a Bragg glass density wave phase in a transition-metal dichalcogenide

Jun-ichi Okamoto·Carlos J. Arguello·Ethan P. Rosenthal·Abhay N. Pasupathy·Andrew J. Millis
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Abstract

Analysis of the spatial dependence of current-voltage characteristics obtained from scanning tunneling microscopy experiments indicates that the charge density wave (CDW) occurring in NbSe$_2$ is subject to locally strong pinning by a non-negligible density of defects, but that on the length scales accessible in this experiment the material is in a "Bragg glass" phase where dislocations and anti-dislocations occur in bound pairs and free dislocations are not observed. A Landau theory-based analysis is presented showing how a strong local modulation may produce only a weak long range effect on the CDW phase.

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Jun-ichi Okamoto, Carlos J. Arguello, Ethan P. Rosenthal, Abhay N. Pasupathy, Andrew J. Millis. 2014-05-21. Experimental evidence for a Bragg glass density wave phase in a transition-metal dichalcogenide. https://doi.org/10.1103/physrevlett.114.026802

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