A Charge Density Wave-like Transition in High Temperature Quenched $Bi_2Se_3$

Li, Yanan; Parsons, Christian; Ramakrishna, Sanath K.; Dwivedi, Anand; Schofield, M. A.; Reyes, A. P.; Guptasarma, P.

doi:10.48550/arxiv.2002.12546

Cited by 2 publications

(2 citation statements)

References 52 publications

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“…82 However, charge density wave order has been found in a weak TI compound as Sb (111) 83 and more recently in Bi 2 Se 3 (thought to be caused by interstitial Bi atoms between the QLs). 84 In fact, the most extended theory is that both LEP and Peierls distortion can coexist and be both the source of the irregularity of the SbTe 6 octahedron. 85 These last studies open the possibility that cation disorder in SnSb 2 Te 4 along the c-axis could lead to the presence of interstitial atoms between the layers and could lead to a 1D Peierls distortion affecting the SbTe 6 units.…”

Section: Methodsmentioning

confidence: 99%

Characterization and Decomposition of the Natural van der Waals SnSb₂Te₄ under Compression

et al. 2020

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High pressure X-ray diffraction, Raman scattering and electrical measurements, together with theoretical calculations, which include the analysis of the topological electron density and electronic localization function, evidence the presence of an isostructural phase transition around 2 GPa, a Fermi resonance around 3.5 GPa and a pressure-induced decomposition of SnSb2Te4 into the high-pressure phases of its parent binary compounds (-Sb2Te3 and SnTe) above 7 GPa. The internal polyhedral compressibility, the behavior of the Raman-active modes, the electrical behavior and the nature of its different bonds under compression have been discussed and compared with their parent binary compounds and with related ternary materials. In this context, the Raman spectrum of SnSb2Te4 exhibits vibrational modes that are associated but forbidden in rocksalt-type SnTe; thus showing a novel way to experimentally observe the forbidden vibrational modes of some compounds. Here, some of the bonds are identified with metavalent bonding, which were already observed in their parent binary compounds. The behavior of SnSb2Te4 is framed within the extended orbital radii map of BA2Te4 compounds, so our results pave the way to understand the pressure behavior and stability ranges of other "natural van der Waals" compounds with similar stoichiometry.

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Section: Methodsmentioning

confidence: 99%

Characterization and Decomposition of the Natural van der Waals SnSb₂Te₄ under Compression

et al. 2020

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“…Recently, similar anomalies have also been reported in Bi 2 Se 3 [39], and Sb 2 Te 3 [40], and it is proposed that the thermallyactivated formation of the stacking faults is responsible for the anomalies in the optical and acoustic phonons, as well as the optical constants. Recently, charge density wave ordering at around 140 K for Bi 2 Se 3 and around 220 K for Cu x Bi 2 Te 2 Se was reported [41,42]. Also, the magnetic susceptibility study of a superconducting Cu x Bi 2 Se 3 (T c ∼ 4.2 K) crystal revealed a charge density instability at ∼96 K [43], somehow lower than that of pure Bi 2 Se 3 .…”

Section: Discussionmentioning

confidence: 97%

Phonon softening and higher-order anharmonic effect in the superconducting topological insulator Sr_xBi₂Se₃

Fang

Pei

et al. 2020

J. Phys.: Condens. Matter

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We report the anharmonic effect of the Raman-scattering spectrum in the low-carrier density superconductor SrxBi2Se3, which is dominated by the quartic term. Compared to the parent Bi2Se3, the superconducting SrxBi2Se3 crystals show obvious phonon softening in the three optical phonon modes , , and . Based on the simulations by the Fano function, we present compelling evidence of the enhanced electron–phonon coupling in SrxBi2Se3 for its smaller asymmetric parameter q. Moreover, an anomalous broadening and intensity antiresonance in the characteristic Raman peaks were observed as the temperature decreased to around 160 K. Thus, the superconducting topological material SrxBi2Se3 represents a counterintuitive example where the electron–phonon interaction is strengthened by the accumulation of electron carriers.

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A Charge Density Wave-like Transition in High Temperature Quenched $Bi_2Se_3$

Cited by 2 publications

References 52 publications

Characterization and Decomposition of the Natural van der Waals SnSb₂Te₄ under Compression

Characterization and Decomposition of the Natural van der Waals SnSb₂Te₄ under Compression

Phonon softening and higher-order anharmonic effect in the superconducting topological insulator Sr_xBi₂Se₃

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A Charge Density Wave-like Transition in High Temperature Quenched $Bi_2Se_3$

Cited by 2 publications

References 52 publications

Characterization and Decomposition of the Natural van der Waals SnSb2Te4 under Compression

Characterization and Decomposition of the Natural van der Waals SnSb2Te4 under Compression

Phonon softening and higher-order anharmonic effect in the superconducting topological insulator Sr x Bi2Se3

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Product

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Characterization and Decomposition of the Natural van der Waals SnSb₂Te₄ under Compression

Characterization and Decomposition of the Natural van der Waals SnSb₂Te₄ under Compression

Phonon softening and higher-order anharmonic effect in the superconducting topological insulator Sr_xBi₂Se₃