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JOURNALS // Fizika Tverdogo Tela // Archive

Fizika Tverdogo Tela, 2019 Volume 61, Issue 11, Pages 2010–2015 (Mi ftt8608)

This article is cited in 4 papers

Metals

NMR investigation of the WTe$_{2}$ Weyl semimetal below the topological transition temperature

A. O. Antonenkoa, E. V. Charnayaa, M. K. Leeb, L.J. Changb, J. Haasec, S. V. Naumovd, A. N. Domozhirovad, V. V. Marchenkovde

a Saint Petersburg State University
b National Cheng Kung University, Tainan, Taiwan
c University of Leipzig, Leipzig, Germany
d Institute of Metal Physics, Ural Division of the Russian Academy of Sciences, Ekaterinburg
e Ural Federal University, Yekaterinburg, Russia

Abstract: NMR investigations are performed on 125Te nuclei of WTe$_{2}$ 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 WTe$_{2}$ 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 WTe$_{2}$. 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.

Keywords: Weyl semimetals, nuclear magnetic resonance, topological phase transition, thermoelectrics.

Received: 24.06.2019
Revised: 24.06.2019
Accepted: 24.06.2019

DOI: 10.21883/FTT.2019.11.48400.546


 English version:
Physics of the Solid State, 2019, 61:11, 1979–1984

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