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

Antonenko, A. O.; Charnaya, E. V.; Pirozerskiĭ, A. L.; Nefedov, D. Yu.; Lee, Min-Kai; Chang, Lo-Yueh; Haase, Jürgen; Наумов, С. В.; Domozhirova, A. N.; Марченков, В. В.

doi:10.1016/j.rinp.2020.103793

Cited by 4 publications

(1 citation statement)

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“…Спектр осцилляций дает непосредственную информацию об энергии Ферми электронных и дырочных карманов в WTe 2 . Эти данные представляют особый интерес в связи с тем, что дителлурид вольфрама рассматривается в качестве возможного полуметалла Вейля на основе теоретических предсказаний и экспериментальных результатов, полученных различными методами (см, например, [12][13][14] и ссылки в этих работах). Измерения магнитосопротив-ления и осцилляций Шубникова−де Гааза при разных температурах позволяют изучать температурную эволюцию электронных и дырочных карманов, что важно при анализе трансформации топологии электронных зон [15].…”

Section: Introductionunclassified

Магнитосопротивление и квантовые осцилляции в полуметалле WTe-=SUB=-2-=/SUB=-

Пирозерский¹,

Чарная²,

Lee

et al. 2021

Физика Твердого Тела

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The discovery of extreme magnetoresistance (XMR) in non-magnetic materials attracted attention to the WTe2 semimetal. We have carried out studies of magnetoresistance in a tungsten ditelluride single crystal in the magnetic field range up to 14 T. Magnetoresistance increased with increasing field following a near quadratic law without saturation. The Shubnikov-de Haas oscillations were observed. Four fundamental frequencies were found in the oscillations spectrum, which correspond to two electron and two hole pockets caused by strong spin-orbit coupling.

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Section: Introductionunclassified

Магнитосопротивление и квантовые осцилляции в полуметалле WTe-=SUB=-2-=/SUB=-

Пирозерский¹,

Чарная²,

Lee

et al. 2021

Физика Твердого Тела

Self Cite

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Experimental nuclear quadrupole resonance and computational study of the structurally refined topological semimetal TaSb2

Fujii,

Janson,

Yasuoka

et al. 2024

Phys. Rev. B

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The local electric field gradients and magnetic dynamics of TaSb2 have been studied using Sb121, Sb123, and Ta181 nuclear quadrupole resonance (NQR) with density functional theory (DFT) calculations using XRD-determined crystal structures. By measuring all structurally expected 13 NQR lines, the nuclear quadrupole coupling constant (νQ) and asymmetric parameter (η) for Ta, Sb(1), and Sb(2) sites were obtained. These values are all in good agreement with the presented DFT calculations. Principal axes of the electric field gradients was determined for a single-crystal sample by measuring the angular dependencies of NMR frequency under a weak magnetic field. The unusual temperature dependence of η(T) of Sb(2) hints at the suppressed thermal expansion along the a axis. Spin-lattice relaxation rate (1/T1T) measurements reveal an activated-type behavior and an upturn below 30 K. Neither the low-temperature upturn nor the high-temperature activation-type behaviors are reproduced by the calculated 1/T1T based on the calculated density of states (DOS). On the other hand, the agreement between the calculated DOS and specific heat measurements indicates that the band renormalization is small. This fact indicates that TaSb2 deviates from the simple semimetal scenario, and magnetic excitations are not captured by Fermi liquid theory. Published by the American Physical Society 2024

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