NMR Investigation of the WTe2 Weyl Semimetal below the Topological Transition Temperature
- Authors: Antonenko A.O.1, Charnaya E.V.1, Lee M.K.2, Chang L.J.2, Haase J.3, Naumov S.V.4, Domozhirova A.N.4, Marchenkov V.V.4,5
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Affiliations:
- St. Petersburg State University
- National Cheng Kung University
- University of Leipzig
- Mikheev Institute of Metal Physics, Ural Branch of the Russian Academy of Sciences
- Ural Federal University
- Issue: Vol 61, No 11 (2019)
- Pages: 1979-1984
- Section: Metals
- URL: https://journal-vniispk.ru/1063-7834/article/view/206458
- DOI: https://doi.org/10.1134/S1063783419110040
- ID: 206458
Cite item
Abstract
NMR investigations are performed on 125Te nuclei of WTe2 Weyl topological semimetal at temperatures of 41 and 293 K. The measurements were carried out using a Bruker Avance 500 NMR pulse spectrometer. The 125Te NMR spectra for a WTe2 single crystal are obtained for the orientation of crystal axis c parallel and perpendicular to the quantizing field. A complicated form of the spectra was related to the presence of four nonequivalent positions of tellurium atoms in the crystalline structure of WTe2. The longitudinal magnetization recovery was studied after the pulse saturation for particular spectral lines. An exponential character of relaxation is revealed. The frequency shift and width of spectral lines were found to be insignificantly different at the two temperatures, while the times of nuclear spin-lattice relaxation at 41 K exceeded approximately by 30 times the corresponding times measured at room temperature. The strong temperature dependence of the relaxation is supposedly related to the contribution of the Weyl quasi-particles below the topological phase transition.
About the authors
A. O. Antonenko
St. Petersburg State University
Email: charnaya@mail.ru
Russian Federation, St. Petersburg
E. V. Charnaya
St. Petersburg State University
Author for correspondence.
Email: charnaya@mail.ru
Russian Federation, St. Petersburg
M. K. Lee
National Cheng Kung University
Email: charnaya@mail.ru
Taiwan, Province of China, Tainan
L. J. Chang
National Cheng Kung University
Email: charnaya@mail.ru
Taiwan, Province of China, Tainan
J. Haase
University of Leipzig
Email: charnaya@mail.ru
Germany, Leipzig
S. V. Naumov
Mikheev Institute of Metal Physics, Ural Branch of the Russian Academy of Sciences
Email: charnaya@mail.ru
Russian Federation, Yekaterinburg
A. N. Domozhirova
Mikheev Institute of Metal Physics, Ural Branch of the Russian Academy of Sciences
Email: charnaya@mail.ru
Russian Federation, Yekaterinburg
V. V. Marchenkov
Mikheev Institute of Metal Physics, Ural Branch of the Russian Academy of Sciences; Ural Federal University
Email: charnaya@mail.ru
Russian Federation, Yekaterinburg; Yekaterinburg
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