NMR Investigation of the WTe2 Weyl Semimetal below the Topological Transition Temperature

A. O. Antonenko, E. V. Charnaya, M. K. Lee, L. J. Chang, J. Haase, S. V. Naumov, A. N. Domozhirova, V. V. Marchenkov

Research output: Contribution to journalArticle

Abstract

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.

Original languageEnglish
Pages (from-to)1979-1984
Number of pages6
JournalPhysics of the Solid State
Volume61
Issue number11
DOIs
Publication statusPublished - 2019 Nov 1

Fingerprint

Metalloids
metalloids
Superconducting transition temperature
transition temperature
Nuclear magnetic resonance
nuclear magnetic resonance
line spectra
Tellurium
tellurium
elementary excitations
pulses
spin-lattice relaxation
nuclear spin
Temperature
frequency shift
Spin-lattice relaxation
recovery
Crystal orientation
spectrometers
saturation

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Antonenko, A. O. ; Charnaya, E. V. ; Lee, M. K. ; Chang, L. J. ; Haase, J. ; Naumov, S. V. ; Domozhirova, A. N. ; Marchenkov, V. V. / NMR Investigation of the WTe2 Weyl Semimetal below the Topological Transition Temperature. In: Physics of the Solid State. 2019 ; Vol. 61, No. 11. pp. 1979-1984.
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Antonenko, AO, Charnaya, EV, Lee, MK, Chang, LJ, Haase, J, Naumov, SV, Domozhirova, AN & Marchenkov, VV 2019, 'NMR Investigation of the WTe2 Weyl Semimetal below the Topological Transition Temperature', Physics of the Solid State, vol. 61, no. 11, pp. 1979-1984. https://doi.org/10.1134/S1063783419110040

NMR Investigation of the WTe2 Weyl Semimetal below the Topological Transition Temperature. / Antonenko, A. O.; Charnaya, E. V.; Lee, M. K.; Chang, L. J.; Haase, J.; Naumov, S. V.; Domozhirova, A. N.; Marchenkov, V. V.

In: Physics of the Solid State, Vol. 61, No. 11, 01.11.2019, p. 1979-1984.

Research output: Contribution to journalArticle

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AU - Antonenko, A. O.

AU - Charnaya, E. V.

AU - Lee, M. K.

AU - Chang, L. J.

AU - Haase, J.

AU - Naumov, S. V.

AU - Domozhirova, A. N.

AU - Marchenkov, V. V.

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N2 - 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.

AB - 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.

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