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Scientific article
Open access
English

Energy-dependent spatial texturing of charge order in 1T-CuxTiSe2

Published inPhysical Review. B, Condensed Matter, vol. 99, no. 155133, p. 1-7
Publication date2019
Abstract

We report a detailed study of the microscopic effects of Cu intercalation on the charge density wave (CDW) in 1T-CuxTiSe2. Scanning tunneling microscopy and spectroscopy reveal a unique, Cu-driven spatial texturing of the charge-ordered phase, with the appearance of energy-dependent CDW patches and sharp π-phase shift domain walls (πDWs). The energy and doping dependencies of the patchwork are directly linked to the inhomogeneous potential landscape due to the Cu intercalants. They imply a CDW gap with unusual features, including a large amplitude, the opening below the Fermi level, and a shift to higher binding energy with electron doping. Unlike the patchwork, the πDWs occur independently of the intercalated Cu distribution. They remain atomically sharp throughout the investigated phase diagram and occur in both superconducting and nonsuperconducting specimens. These results provide unique atomic-scale insight into the CDW ground state, questioning the existence of incommensurate CDW domain walls and contributing to understanding its formation mechanism and interplay with superconductivity.

Keywords
  • Transition metal dichalcogenides
  • Charge density waves
  • Superconductivity
  • Scanning tunneling microscopy
Research group
Funding
  • Swiss National Science Foundation - 162517
Citation (ISO format)
SPERA, Marcello et al. Energy-dependent spatial texturing of charge order in 1<i>T</i>-Cu<sub>x</sub>TiSe<sub>2</sub>. In: Physical Review. B, Condensed Matter, 2019, vol. 99, n° 155133, p. 1–7. doi: 10.1103/PhysRevB.99.155133
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Identifiers
ISSN of the journal1098-0121
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