Open AccessЯМР-исследование полуметалла Вейля WTe-=SUB=-2-=/SUB=- ниже температуры топологического перехода
Author(s) -
А.О. Антоненко,
Е.В. Чарная,
M.K. Lee,
Ling-Hua Chang,
J. Haase,
С.В. Наумов,
А.Н. Доможирова,
В.В. Марченков
Publication year - 2019
Publication title -
fizika tverdogo tela
Language(s) - English
Resource type - Journals
eISSN - 1726-7498
pISSN - 0367-3294
DOI - 10.21883/ftt.2019.11.48400.546
Subject(s) - spectral line , relaxation (psychology) , condensed matter physics , spin–lattice relaxation , nmr spectra database , materials science , tellurium , weyl semimetal , saturation (graph theory) , magnetization , crystal structure , semimetal , nuclear magnetic resonance , crystallography , magnetic field , chemistry , physics , nuclear quadrupole resonance , band gap , psychology , social psychology , mathematics , combinatorics , astronomy , quantum mechanics , metallurgy
We carried out 125Te NMR studies of a WTe2 topological Weyl semimetal at temperatures of 41 and 293 K. Measurements were performed using a pulse Bruker Avance 500 NMR spectrometer. 125Te NMR spectra were obtained for the WTe2 single crystal at the orientation of the crystalline c axis parallel and perpendicular to the quantized field. We ascribed the complex spectra to four non-equivalent tellurium sites in the WTe2 crystalline structure. The recovery of the longitudinal magnetization was studied after the pulse saturation of particular lines in the spectra. We observed the single-exponential relaxation. The frequency shifts and widths of the spectral lines differed insignificantly at two temperatures while the spin-lattice relaxation times at 41 K were by a factor of approximately 30 greater than the relevant times at room temperature. Strong temperature dependence of relaxation was suggested to be due to the contribution of Weyl quasi-particles below the topological phase transition.