Effects of electron beam generated lattice defects on the periodic lattice distortion structure in 1T-Ta S2 and 1T-TaS e2 thin layers

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Effects of electron beam generated lattice defects on the periodic lattice distortion structure in 1T-Ta S2 and 1T-TaS e2 thin layers. / Kinyanjui, M. K.; Björkman, T.; Lehnert, T.; Köster, J.; Krasheninnikov, A.; Kaiser, U.

In: Physical Review B, Vol. 99, No. 2, 024101, 02.01.2019, p. 1-11.

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Kinyanjui, M. K. ; Björkman, T. ; Lehnert, T. ; Köster, J. ; Krasheninnikov, A. ; Kaiser, U. / Effects of electron beam generated lattice defects on the periodic lattice distortion structure in 1T-Ta S2 and 1T-TaS e2 thin layers. In: Physical Review B. 2019 ; Vol. 99, No. 2. pp. 1-11.

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@article{934444b940394453ae0e821aadb12e36,
title = "Effects of electron beam generated lattice defects on the periodic lattice distortion structure in 1T-Ta S2 and 1T-TaS e2 thin layers",
abstract = "We have investigated the influence of electron beam generated defects on the structure of periodic lattice distortions (PLDs) which accompany charge density wave modulations in 1T-TaS2 and 1T-TaSe2. Lattice defects were generated through irradiation with high-energy electrons in a transmission electron microscope (TEM). Using atomically resolved high-resolution TEM imaging, we investigate the PLD structure and the changes in this structure with prolonged exposure to the electron beam. We observe the formation of dislocationlike topological defects in the PLD structure. Prolonged exposure to the electron beam also leads to an increase in density of these defects. This is also accompanied by an increase in structural disorder of the PLD. Density functional theory calculations were also performed in order to understand sulfur (S) and selenium (Se) vacancy defect formation in 1T-TaSe2 and 1T-TaS2 and their effects on the PLD structure. The formation energy of Se/S vacancies was calculated to be lowest for the highly displaced S/Se atoms in the vicinity of PLD maxima. Vacancies formed at the less displaced sites near the PLD minima were found to have lower formation energy. The calculations also showed that an increase in the S/Se vacancies leads to the formation of dislocations and an increase in disorder in the PLD structures. This supports the experimental observations.",
author = "Kinyanjui, {M. K.} and T. Bj{\"o}rkman and T. Lehnert and J. K{\"o}ster and A. Krasheninnikov and U. Kaiser",
year = "2019",
month = "1",
day = "2",
doi = "10.1103/PhysRevB.99.024101",
language = "English",
volume = "99",
pages = "1--11",
journal = "Physical Review B (Condensed Matter and Materials Physics)",
issn = "2469-9950",
publisher = "American Physical Society",
number = "2",

}

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TY - JOUR

T1 - Effects of electron beam generated lattice defects on the periodic lattice distortion structure in 1T-Ta S2 and 1T-TaS e2 thin layers

AU - Kinyanjui, M. K.

AU - Björkman, T.

AU - Lehnert, T.

AU - Köster, J.

AU - Krasheninnikov, A.

AU - Kaiser, U.

PY - 2019/1/2

Y1 - 2019/1/2

N2 - We have investigated the influence of electron beam generated defects on the structure of periodic lattice distortions (PLDs) which accompany charge density wave modulations in 1T-TaS2 and 1T-TaSe2. Lattice defects were generated through irradiation with high-energy electrons in a transmission electron microscope (TEM). Using atomically resolved high-resolution TEM imaging, we investigate the PLD structure and the changes in this structure with prolonged exposure to the electron beam. We observe the formation of dislocationlike topological defects in the PLD structure. Prolonged exposure to the electron beam also leads to an increase in density of these defects. This is also accompanied by an increase in structural disorder of the PLD. Density functional theory calculations were also performed in order to understand sulfur (S) and selenium (Se) vacancy defect formation in 1T-TaSe2 and 1T-TaS2 and their effects on the PLD structure. The formation energy of Se/S vacancies was calculated to be lowest for the highly displaced S/Se atoms in the vicinity of PLD maxima. Vacancies formed at the less displaced sites near the PLD minima were found to have lower formation energy. The calculations also showed that an increase in the S/Se vacancies leads to the formation of dislocations and an increase in disorder in the PLD structures. This supports the experimental observations.

AB - We have investigated the influence of electron beam generated defects on the structure of periodic lattice distortions (PLDs) which accompany charge density wave modulations in 1T-TaS2 and 1T-TaSe2. Lattice defects were generated through irradiation with high-energy electrons in a transmission electron microscope (TEM). Using atomically resolved high-resolution TEM imaging, we investigate the PLD structure and the changes in this structure with prolonged exposure to the electron beam. We observe the formation of dislocationlike topological defects in the PLD structure. Prolonged exposure to the electron beam also leads to an increase in density of these defects. This is also accompanied by an increase in structural disorder of the PLD. Density functional theory calculations were also performed in order to understand sulfur (S) and selenium (Se) vacancy defect formation in 1T-TaSe2 and 1T-TaS2 and their effects on the PLD structure. The formation energy of Se/S vacancies was calculated to be lowest for the highly displaced S/Se atoms in the vicinity of PLD maxima. Vacancies formed at the less displaced sites near the PLD minima were found to have lower formation energy. The calculations also showed that an increase in the S/Se vacancies leads to the formation of dislocations and an increase in disorder in the PLD structures. This supports the experimental observations.

UR - http://www.scopus.com/inward/record.url?scp=85059898092&partnerID=8YFLogxK

U2 - 10.1103/PhysRevB.99.024101

DO - 10.1103/PhysRevB.99.024101

M3 - Article

VL - 99

SP - 1

EP - 11

JO - Physical Review B (Condensed Matter and Materials Physics)

JF - Physical Review B (Condensed Matter and Materials Physics)

SN - 2469-9950

IS - 2

M1 - 024101

ER -

ID: 31435663