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

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.

arXiv comment5+4 pages

References in corpus (7)

• Elastic theory of flux lattices in presence of weak disorder
• Elastic Theory of pinned flux lattices
• Phase diagrams of flux lattices with disorder
• Extended Phonon Collapse and the Origin of the Charge-Density-Wave in NbSe${}_2$
• Effect of dimensionality on the charge-density-wave in few-layers 2H-NbSe${}_2$
• A Bragg glass phase in the vortex lattice of a type II superconductor
• X-ray spectrum of a pinned charge density wave

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• Disorder Induced Suppression of CDW Long Range Order: STM Study of Pd-intercalated ErTe3
• Holographic imaging of the complex charge density wave order parameter
• Energy-dependent spatial texturing of the charge order in $1T$-Cu${}_x$TiSe${}_2$
• Bragg glass signatures in Pd${}_x$ErTe${}_3$ with X-ray diffraction Temperature Clustering (X-TEC)
• Spin and pair density wave glasses
• Topological order generated by random field in a 2D exchange model
• Diffuse Scattering from Correlated Electron Systems
• Visualization of alternating triangular domains of charge density waves in 2H-NbSe${}_2$ by scanning tunneling microscopy
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• Effect of Dilute Random Field on Continuous-Symmetry Order Parameter
• Inverse melting and re-entrant transformations of the vortex lattice in amorphous Re6Zr thin film
• Phonon coupling to dynamic short-range polar order in a relaxor ferroelectric near the morphotropic phase boundary
• Effect of dilute, strongly pinning impurities on charge density waves
• Generation of localized magnetic moments in the charge-density-wave state
• Influence of surface relaxations on scanning probe microscopy images of the charge density wave material 2H-NbSe${}_2$
• Delusive chirality and periodic strain pattern in moiré systems