NMR study of topological insulator Bi2Te3 in a wide temperature range

Antonenko, A. O.; Charnaya, E. V.; Nefedov, D. Yu.; Podorozhkin, D. Yu.; Усков, А. В.; Бугаев, А. С.; Lee, M. K.; Chang, Lo-Yueh; Наумов, С. В.; Perevozchikova, Yu. A.; Chistyakov, V. V.; Huang, Jung-Chun Andrew; Марченков, В. В.

doi:10.1134/s1063783417120058

Cited by 12 publications

(16 citation statements)

References 23 publications

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“…Bearing in mind the strong negative NMR frequency shift by decreasing temperature 12,14 , a nice correlation between the theoretical and experimental spectra is witnessed. This is strong evidence that the isotropic 125 Te NMR signal component at −452 ppm belongs to the surface NMR signal shielded by the Dirac electrons.…”

Section: Discussionmentioning

confidence: 73%

“…4a, c. These values are shifted in comparison to the experimental ones, mainly due to the strong temperature dependence of the NMR frequency 14 , as shown in the inset of Fig. 4a.…”

Section: E-ementioning

confidence: 74%

“…Both spectra exhibit different overall profiles, but with similar features; each is characterized by a central peak at a shift of 250 ppm (microcrystals) and 480 ppm (nanoplatelets), respectively, with a tail at higher shift, and a shoulder at negative shift. In case of the microcrystalline material these features have been explained as originating from the presence of two overlapping signals shifted relative to each other 14 : one strong narrow resonance at 250 ppm from Te(1), and a broader asymmetric resonance at a shift of −400 ppm from Te(2). Implementation of advanced 1D solid-state MAS NMR methods, such as the double adiabatic echo (DAE) experiment did not improve the resolution, as seen in the Supplementary Fig.…”

Section: E-ementioning

confidence: 99%

“…According to recent theoretical calculations on TI's the orbital term δ orb from the Dirac electrons dominates over δ FC and δ dip , and induces large negative shifts, and very short spinlattice relaxation times T 1 12 . However, until now experimental 125 Te NMR studies on Bi 2 Te 3 nanoparticles 13 and microcrystalline (bulk) powders 14 have given contradicting results.…”

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confidence: 99%

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Resolving Dirac electrons with broadband high-resolution NMR

et al. 2020

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Detecting the metallic Dirac electronic states on the surface of Topological Insulators (TIs) is critical for the study of important surface quantum properties (SQPs), such as Majorana zero modes, where simultaneous probing of the bulk and edge electron states is required. However, there is a particular shortage of experimental methods, showing at atomic resolution how Dirac electrons extend and interact with the bulk interior of nanoscaled TI systems. Herein, by applying advanced broadband solid-state 125 Te nuclear magnetic resonance (NMR) methods on Bi 2 Te 3 nanoplatelets, we succeeded in uncovering the hitherto invisible NMR signals with magnetic shielding that is influenced by the Dirac electrons, and we subsequently showed how the Dirac electrons spread inside the nanoplatelets. In this way, the spin and orbital magnetic susceptibilities induced by the bulk and edge electron states were simultaneously measured at atomic scale resolution, providing a pertinent experimental approach in the study of SQPs.

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Section: Discussionmentioning

confidence: 73%

“…4a, c. These values are shifted in comparison to the experimental ones, mainly due to the strong temperature dependence of the NMR frequency 14 , as shown in the inset of Fig. 4a.…”

Section: E-ementioning

confidence: 74%

Section: E-ementioning

confidence: 99%

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confidence: 99%

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Resolving Dirac electrons with broadband high-resolution NMR

et al. 2020

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“…More recent work in single crystals has identified distinct resonances from inequivalent chalcogen planes, and a more detailed analysis of the chalcogen NMR is required. [30][31][32] While a great deal is known about the TSS from surface sensitive probes, little is known about how this behaviour transitions to the bulk as a function of depth below the crystal surface. We plan to address this question using highly spinpolarized radioactive ions, specifically, using depth-resolved βdetected nuclear magnetic resonance and relaxation (β-NMR) 33 with short-lived 8 Li as the probe nucleus, similar to low-energy muon spin rotation (µSR).…”

Section: Introductionmentioning

confidence: 99%

Ionic and electronic properties of the topological insulator Bi2Te2Se investigated via β -detected nuclear magnetic relaxation and resonance of
McFadden
¹
,
Chatzichristos
²
,
Chow
³

et al. 2019
Phys. Rev. B
11
0
6
0
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We report measurements on the high temperature ionic and low temperature electronic properties of the 3D topological insulator Bi 2 Te 2 Se using ion-implanted 8 Li β-detected nuclear magnetic relaxation and resonance. With implantation energies in the range 5-28 keV, the probes penetrate beyond the expected range of the topological surface state, but are still within 250 nm of the surface. At temperatures above ∼150 K, spin-lattice relaxation measurements reveal isolated 8 Li + diffusion with an activation energy E A = 0.185(8) eV and attempt frequency τ −1 0 = 8(3) × 10 11 s −1 for atomic site-to-site hopping. At lower temperature, we find a linear Korringa-like relaxation mechanism with a field dependent slope and intercept, which is accompanied by an anomalous field dependence to the resonance shift. We suggest that these may be related to a strong contribution from orbital currents or the magnetic freezeout of charge carriers in this heavily compensated semiconductor, but that conventional theories are unable to account for the extent of the field dependence. Conventional NMR of the stable host nuclei may help elucidate their origin. arXiv:1810.07879v3 [cond-mat.mtrl-sci]

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¹²⁵Te NMR study of the bulk of topological insulators Bi₂Te₃ and Sb₂Te₃

Nachtigal

Chong

Williams

et al. 2022

Zeitschrift anorg allge chemie

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The narrow band gap semiconductors Bi2Te3 and Sb2Te3 are well known for their room temperature thermoelectric performance. Recently, they were shown to serve as model systems of three‐dimensional topological insulators with a bulk band gap and very robust, spin‐resolved surface states due to a special band inversion in their periodic bulk. Evidently, it is of interest to investigate the special surface states with a local probe like nuclear magnetic resonance (NMR). However, especially the bulk NMR of these materials shows peculiar and rather unexpected phenomena, e. g., a magnetic field induced deformation of the local charge symmetry and excessive line broadening due to a special internuclear coupling. Here we report a comprehensive account of the room temperature NMR properties of the spin‐1/2 nucleus 125Te of single crystalline Bi2Te3 and Sb2Te3. This includes a very unusual spin‐lattice relaxation that seems not to be reflected in the NMR shift, as well as an exchange enhanced NMR line broadening.

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NMR study of topological insulator Bi2Te3 in a wide temperature range

Cited by 12 publications

References 23 publications

Resolving Dirac electrons with broadband high-resolution NMR

Resolving Dirac electrons with broadband high-resolution NMR

Ionic and electronic properties of the topological insulator Bi2Te2Se investigated via β -detected nuclear magnetic relaxation and resonance of
McFadden
¹
,
Chatzichristos
²
,
Chow
³

et al. 2019
Phys. Rev. B
11
0
6
0
View full text Add to dashboard Cite

¹²⁵Te NMR study of the bulk of topological insulators Bi₂Te₃ and Sb₂Te₃

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NMR study of topological insulator Bi2Te3 in a wide temperature range

Cited by 12 publications

References 23 publications

Resolving Dirac electrons with broadband high-resolution NMR

Resolving Dirac electrons with broadband high-resolution NMR

Ionic and electronic properties of the topological insulator Bi2Te2Se investigated via β -detected nuclear magnetic relaxation and resonance of McFadden1, Chatzichristos2, Chow3 et al. 2019Phys. Rev. B11060View full textAdd to dashboardCite

125Te NMR study of the bulk of topological insulators Bi2Te3 and Sb2Te3

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Ionic and electronic properties of the topological insulator Bi2Te2Se investigated via β -detected nuclear magnetic relaxation and resonance of
McFadden
¹
,
Chatzichristos
²
,
Chow
³

et al. 2019
Phys. Rev. B
11
0
6
0
View full text Add to dashboard Cite

¹²⁵Te NMR study of the bulk of topological insulators Bi₂Te₃ and Sb₂Te₃