A recent experimental work has reported an excess of the non-linear conductivity in the charge density wave (CDW) sliding mode of the quasi one-dimensional compound (TaSe4)2I, when a magnetic field is applied co-linearly to the electric field [Gooth et al., Nature 575, 315 (2019)]. This result has opened a conceptual approach, where the CDW gap in (TaSe4)2I is opened between Weyl fermions of opposite chirality with the assumption that this compound is a Weyl semi-metal in its undistorted high temperature phase. We report measurements in the sliding state of (TaSe4)2I performed in similar conditions. We have found no increase in the magnetoconductivity. In our attempts for understanding this unsettling discrepancy, we stress the specific nature of the Peierls transition in (TaSe4)2I and the strong electron-phonon coupling present in this compound. Given the lack of further evidence, we think that it is premature to assert that (TaSe4)2I is an axionic insulator.
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7 February 2022
Research Article|
February 08 2022
Does (TaSe4)2I really harbor an axionic charge density wave?
Special Collection:
One-Dimensional van der Waals Materials
A. A. Sinchenko
;
A. A. Sinchenko
a)
1
M.V. Lomonosov Moscow State University
, 119991 Moscow, Russia
2
Kotelnikov Institute of Radioengineering and Electronics of RAS
, 125009 Moscow, Russia
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R. Ballou;
R. Ballou
3
University Grenoble Alpes
, Institute Neel, F-38042 Grenoble, France
4
CNRS
, Institute Neel, F-38042 Grenoble, France
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J. E. Lorenzo
;
J. E. Lorenzo
3
University Grenoble Alpes
, Institute Neel, F-38042 Grenoble, France
4
CNRS
, Institute Neel, F-38042 Grenoble, France
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Th. Grenet
;
Th. Grenet
3
University Grenoble Alpes
, Institute Neel, F-38042 Grenoble, France
4
CNRS
, Institute Neel, F-38042 Grenoble, France
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P. Monceau
P. Monceau
a)
3
University Grenoble Alpes
, Institute Neel, F-38042 Grenoble, France
4
CNRS
, Institute Neel, F-38042 Grenoble, France
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A. A. Sinchenko
1,2,a)
R. Ballou
3,4
J. E. Lorenzo
3,4
Th. Grenet
3,4
P. Monceau
3,4,a)
1
M.V. Lomonosov Moscow State University
, 119991 Moscow, Russia
2
Kotelnikov Institute of Radioengineering and Electronics of RAS
, 125009 Moscow, Russia
3
University Grenoble Alpes
, Institute Neel, F-38042 Grenoble, France
4
CNRS
, Institute Neel, F-38042 Grenoble, France
Note: This paper is part of the APL Special Collection on One-Dimensional van der Waals Materials.
Appl. Phys. Lett. 120, 063102 (2022)
Article history
Received:
November 30 2021
Accepted:
January 03 2022
Citation
A. A. Sinchenko, R. Ballou, J. E. Lorenzo, Th. Grenet, P. Monceau; Does (TaSe4)2I really harbor an axionic charge density wave?. Appl. Phys. Lett. 7 February 2022; 120 (6): 063102. https://doi.org/10.1063/5.0080380
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