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.
This work was supported by the Russian Foundation for Basic Research (projects nos. 19-57-52001, 19-07-00028, and 17-52-52008) in the framework of the governmental task of the Ministry of Education and Science of the Ru-ssian Federation (theme “Spin”, no. AAAA-A18-118020290104-2) with a partial support of the Government of the Russian Federation (regulation no. 211, contract no. 02.A03.21.0006).
Citation:
A. O. Antonenko, E. V. Charnaya, M. K. Lee, L.J. Chang, J. Haase, S. V. Naumov, A. N. Domozhirova, V. V. Marchenkov, “NMR investigation of the WTe$_{2}$ Weyl semimetal below the topological transition temperature”, Fizika Tverdogo Tela, 61:11 (2019), 2010–2015; Phys. Solid State, 61:11 (2019), 1979–1984
\Bibitem{AntChaLee19}
\by A.~O.~Antonenko, E.~V.~Charnaya, M.~K.~Lee, L.J.~Chang, J.~Haase, S.~V.~Naumov, A.~N.~Domozhirova, V.~V.~Marchenkov
\paper NMR investigation of the WTe$_{2}$ Weyl semimetal below the topological transition temperature
\jour Fizika Tverdogo Tela
\yr 2019
\vol 61
\issue 11
\pages 2010--2015
\mathnet{http://mi.mathnet.ru/ftt8608}
\crossref{https://doi.org/10.21883/FTT.2019.11.48400.546}
\elib{https://elibrary.ru/item.asp?id=41300764}
\transl
\jour Phys. Solid State
\yr 2019
\vol 61
\issue 11
\pages 1979--1984
\crossref{https://doi.org/10.1134/S1063783419110040}
Linking options:
https://www.mathnet.ru/eng/ftt8608
https://www.mathnet.ru/eng/ftt/v61/i11/p2010
This publication is cited in the following 4 articles:
Toshiki Yokoo, Yukihiro Watanabe, Masashi Kumazaki, Masayuki Itoh, Yasuhiro Shimizu, “Site-Dependent Local Spin Susceptibility and Low-Energy Excitation in a Weyl Semimetal WTe2”, J. Phys. Soc. Jpn., 91:5 (2022)
A.O. Antonenko, E.V. Charnaya, A.L. Pirozerskii, D.Yu. Nefedov, M.K. Lee, L.J. Chang, J. Haase, S.V. Naumov, A.N. Domozhirova, V.V. Marchenkov, “125Te spin-lattice relaxation in a candidate to Weyl semimetals WTe2”, Results in Physics, 21 (2021), 103793
B. Rahman Rano, Ishtiaque M. Syed, S.H. Naqib, “Elastic, electronic, bonding, and optical properties of WTe2 Weyl semimetal: A comparative investigation with MoTe2 from first principles”, Results in Physics, 19 (2020), 103639
D. Tay, T. Shang, P. Puphal, E. Pomjakushina, H.-R. Ott, T. Shiroka, “Unusual
Al27
NMR shift in the Weyl-fermion systems LaAlGe and PrAlGe”, Phys. Rev. B, 102:24 (2020)
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