Local trigonal modes and the suppression of the charge density wave in TiSe2-xTex

A. Wegner; D. Louca; J. Yang

doi:10.1103/PhysRevB.99.205110

Local trigonal modes and the suppression of the charge density wave in TiSe2-xTex

A. Wegner, D. Louca, J. Yang

Research output: Contribution to journal › Article › peer-review

5 Scopus citations

Abstract

The composition dependence of the charge density wave (CDW) state is investigated in a solid solution of 1T-TiSe2-xTe2 using neutron scattering and a pair density function analysis. It is observed that the CDW order is quickly suppressed with doping, between 0.2≤x≤0.25. The suppression of the CDW is coupled with a change in the local symmetry from hexagonal to monoclinic. In the monoclinic, high-temperature phase, a Jahn-Teller (JT) distortion is observed between Ti and Se bonds that is suppressed with Te doping. These observations favor a CDW that is driven by a cooperative JT effect, as Ti-Se bond shortening is crucial to CDW formation and excess chalcogen to Ti charge transfer inhibits the JT mechanism.

Original language	English (US)
Article number	205110
Journal	Physical Review B
Volume	99
Issue number	20
DOIs	https://doi.org/10.1103/PhysRevB.99.205110
State	Published - May 9 2019
Externally published	Yes

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

Access to Document

10.1103/PhysRevB.99.205110

Cite this

@article{5b2304653532404995766cb739a52fdb,

title = "Local trigonal modes and the suppression of the charge density wave in TiSe2-xTex",

abstract = "The composition dependence of the charge density wave (CDW) state is investigated in a solid solution of 1T-TiSe2-xTe2 using neutron scattering and a pair density function analysis. It is observed that the CDW order is quickly suppressed with doping, between 0.2≤x≤0.25. The suppression of the CDW is coupled with a change in the local symmetry from hexagonal to monoclinic. In the monoclinic, high-temperature phase, a Jahn-Teller (JT) distortion is observed between Ti and Se bonds that is suppressed with Te doping. These observations favor a CDW that is driven by a cooperative JT effect, as Ti-Se bond shortening is crucial to CDW formation and excess chalcogen to Ti charge transfer inhibits the JT mechanism.",

author = "A. Wegner and D. Louca and J. Yang",

note = "Publisher Copyright: {\textcopyright} 2019 American Physical Society.",

year = "2019",

month = may,

day = "9",

doi = "10.1103/PhysRevB.99.205110",

language = "English (US)",

volume = "99",

journal = "Physical Review B",

issn = "2469-9950",

publisher = "American Institute of Physics",

number = "20",

}

TY - JOUR

T1 - Local trigonal modes and the suppression of the charge density wave in TiSe2-xTex

AU - Wegner, A.

AU - Louca, D.

AU - Yang, J.

PY - 2019/5/9

Y1 - 2019/5/9

N2 - The composition dependence of the charge density wave (CDW) state is investigated in a solid solution of 1T-TiSe2-xTe2 using neutron scattering and a pair density function analysis. It is observed that the CDW order is quickly suppressed with doping, between 0.2≤x≤0.25. The suppression of the CDW is coupled with a change in the local symmetry from hexagonal to monoclinic. In the monoclinic, high-temperature phase, a Jahn-Teller (JT) distortion is observed between Ti and Se bonds that is suppressed with Te doping. These observations favor a CDW that is driven by a cooperative JT effect, as Ti-Se bond shortening is crucial to CDW formation and excess chalcogen to Ti charge transfer inhibits the JT mechanism.

AB - The composition dependence of the charge density wave (CDW) state is investigated in a solid solution of 1T-TiSe2-xTe2 using neutron scattering and a pair density function analysis. It is observed that the CDW order is quickly suppressed with doping, between 0.2≤x≤0.25. The suppression of the CDW is coupled with a change in the local symmetry from hexagonal to monoclinic. In the monoclinic, high-temperature phase, a Jahn-Teller (JT) distortion is observed between Ti and Se bonds that is suppressed with Te doping. These observations favor a CDW that is driven by a cooperative JT effect, as Ti-Se bond shortening is crucial to CDW formation and excess chalcogen to Ti charge transfer inhibits the JT mechanism.

UR - http://www.scopus.com/inward/record.url?scp=85066399944&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85066399944&partnerID=8YFLogxK

U2 - 10.1103/PhysRevB.99.205110

DO - 10.1103/PhysRevB.99.205110

M3 - Article

AN - SCOPUS:85066399944

SN - 2469-9950

VL - 99

JO - Physical Review B

JF - Physical Review B

IS - 20

M1 - 205110

ER -

Local trigonal modes and the suppression of the charge density wave in TiSe2-xTex

Abstract

All Science Journal Classification (ASJC) codes

Access to Document

Other files and links

Fingerprint

Cite this