Research output: Contribution to journal › Article › peer-review
125Te spin-lattice relaxation in a candidate to Weyl semimetals WTe2. / Antonenko, A. O.; Charnaya, E. V.; Pirozerskii, A. L.; Nefedov, D. Yu; Lee, M. K.; Chang, L. J.; Haase, J.; Naumov, S. V.; Domozhirova, A. N.; Marchenkov, V. V.
In: Results in Physics, Vol. 21, 103793, 02.2021.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - 125Te spin-lattice relaxation in a candidate to Weyl semimetals WTe2
AU - Antonenko, A. O.
AU - Charnaya, E. V.
AU - Pirozerskii, A. L.
AU - Nefedov, D. Yu
AU - Lee, M. K.
AU - Chang, L. J.
AU - Haase, J.
AU - Naumov, S. V.
AU - Domozhirova, A. N.
AU - Marchenkov, V. V.
N1 - Funding Information: The authors acknowledge the financial support from RFBR , grants 19-57-52001 , 19-29-03004 , and 19-07-00028 . The work was partly supported by Minobrnauki of Russia (“Spin” No. AAAA-A18-118020290104-2 ) and Russian Government (contract No. 02.A03.21.0006 ). Measurements were partly carried out using the equipment of the Research park of St. Petersburg State University. Publisher Copyright: © 2020 The Author(s) Copyright: Copyright 2020 Elsevier B.V., All rights reserved.
PY - 2021/2
Y1 - 2021/2
N2 - The tungsten ditelluride WTe2 was suggested to belong to the Weyl semimetal family. We studied 125Te spin-lattice relaxation and NMR spectra in a WTe2 single crystal within a large range from 28 K up to room temperature. Measurements were carried out on a Bruker Avance 500 NMR pulse spectrometer for the crystalline c axis directed in parallel and perpendicular to the magnetic field. Relaxation proved to be single-exponential. The relaxation time varied depending on the sample position in magnetic field and frequency offset. The relaxation rate increased about linearly with temperature below 70 K, however the dependence became nearly quadratic at higher temperatures. The relaxation rate within the total temperature range was fitted using a theoretical model developed in Ref. [41] for Weyl semimetals and assuming the decrease of the chemical potential with increasing temperature. The results obtained for 125Te spin-lattice relaxation evidence in favor of the topological nontriviality of the WTe2 semimetal. The 125Te NMR spectra agreed with the occurrence of nonequivalent tellurium sites and varied insignificantly with temperature.
AB - The tungsten ditelluride WTe2 was suggested to belong to the Weyl semimetal family. We studied 125Te spin-lattice relaxation and NMR spectra in a WTe2 single crystal within a large range from 28 K up to room temperature. Measurements were carried out on a Bruker Avance 500 NMR pulse spectrometer for the crystalline c axis directed in parallel and perpendicular to the magnetic field. Relaxation proved to be single-exponential. The relaxation time varied depending on the sample position in magnetic field and frequency offset. The relaxation rate increased about linearly with temperature below 70 K, however the dependence became nearly quadratic at higher temperatures. The relaxation rate within the total temperature range was fitted using a theoretical model developed in Ref. [41] for Weyl semimetals and assuming the decrease of the chemical potential with increasing temperature. The results obtained for 125Te spin-lattice relaxation evidence in favor of the topological nontriviality of the WTe2 semimetal. The 125Te NMR spectra agreed with the occurrence of nonequivalent tellurium sites and varied insignificantly with temperature.
KW - Knight shift
KW - NMR
KW - Spin-lattice relaxation
KW - Tungsten ditelluride
KW - Weyl semimetal
UR - http://www.scopus.com/inward/record.url?scp=85098941495&partnerID=8YFLogxK
UR - https://www.mendeley.com/catalogue/41c66d5d-a3ca-3d7a-8d35-4cb2a44eb42f/
U2 - 10.1016/j.rinp.2020.103793
DO - 10.1016/j.rinp.2020.103793
M3 - Article
AN - SCOPUS:85098941495
VL - 21
JO - Results in Physics
JF - Results in Physics
SN - 2211-3797
M1 - 103793
ER -
ID: 73241241