125Te spin-lattice relaxation in a candidate to Weyl semimetals WTe2

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

arXiv · 2007.12510

125Te spin-lattice relaxation in a candidate to Weyl semimetals WTe2

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

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Abstract

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 two orientations of the crystalline c axis, parallel and perpendicular to 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 [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.

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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. 2020-07-24. 125Te spin-lattice relaxation in a candidate to Weyl semimetals WTe2. https://arxiv.org/abs/2007.12510

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