Novello, AM;
Spera, M;
Scarfato, A;
Ubaldini, A;
Giannini, E;
Bowler, DR;
Renner, C;
(2017)
Stripe and Short Range Order in the Charge Density Wave of 1T-CuxTiSe2.
Physical Review Letters
, 118
(1)
, Article 017002. 10.1103/PhysRevLett.118.017002.
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Abstract
We study the impact of Cu intercalation on the charge density wave (CDW) in 1T−CuxTiSe2 by scanning tunneling microscopy and spectroscopy. Cu atoms, identified through density functional theory modeling, are found to intercalate randomly on the octahedral site in the van der Waals gap and to dope delocalized electrons near the Fermi level. While the CDW modulation period does not depend on Cu content, we observe the formation of charge stripe domains at low Cu content (x<0.02) and a breaking up of the commensurate order into 2×2 domains at higher Cu content. The latter shrink with increasing Cu concentration and tend to be phase shifted. These findings invalidate a proposed excitonic pairing as the primary CDW formation mechanism in this material.
| Type: | Article |
|---|---|
| Title: | Stripe and Short Range Order in the Charge Density Wave of 1T-CuxTiSe2 |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1103/PhysRevLett.118.017002 |
| Publisher version: | https://doi.org/10.1103/PhysRevLett.118.017002 |
| Language: | English |
| Additional information: | Copyright © 2017 American Physical Society. |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/1539942 |
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