Characterization of the charge density wave transition and observation of the amplitude mode in 
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Kuo, C. N.; Shen, Dong; Li, B. S.; Quyen, Nguyen Nhat; Tzeng, Wen Yen; Luo, Chih‐Wei; Wang, L. M.; Kuo, Y. K.; Lue, Chin‐Shan

doi:10.1103/physrevb.99.235121

Cited by 23 publications

(22 citation statements)

References 34 publications

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“…In practice, single crystals with imperfect chains (quasi-1D), or imperfect nestings (quasi-2D), can lead to such an energy gap being partially opened. This is more often seen as a metal-to-semimetal transition similar to our observations in figure 6 in our data, and as also observed in multiple other systems [40,41]. The CDW transition observed here in Cu 0.3 Bi 2 Te 2 Se is likely to be related to the nature of the quintuple layers in this material.…”

Section: Further Discussionsupporting

confidence: 91%

Possible lattice and charge order in Cu_xBi₂Te₂Se

Smith

Rexhausen

et al. 2019

J. Phys. Mater.

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Metal intercalation into layered topological insulator materials such as the binary chalcogenide Bi 2 X 3 (X=Te or Se) has yielded novel two-dimensional (2D) electron-gas physics, phase transitions to superconductivity, as well as interesting magnetic ground states. Of recent interest is the intercalationdriven interplay between lattice distortions, density wave ordering, and the emergence of new phenomena in the vicinity of instabilities induced by intercalation. Here, we examine the effects of Cu-intercalation on the ternary chalcogenide Bi 2 Te 2 Se. We report the discovery, in Cu 0.3 Bi 2 Te 2 Se, of a periodic lattice distortion (PLD) at room temperature, together with a charge density wave (CDW) transition around T d =220 K. We also report, for the first time, a complete study of the Cu x Bi 2 Te 2 Se system, and the effect of Cu-intercalation on crystal structure, phonon structure, and electronic properties for 0.0x0.5. Our electron diffraction studies reveal strong Bragg spots at reciprocal lattice positions forbidden by ABC stacking, possibly resulting from stacking faults, or a superlattice. The c-axis lattice parameter varies monotonically with x for 0<x<0.2, but drops precipitously for higher x. Similarly, Raman phonon modes A g 1 2 and E g 2 soften monotonically for 0<x<0.2 but harden sharply for x>0.2. This indicates that Cu likely intercalates up to x∼0.2, followed by partial site-substitutions at higher values. The resulting strain makes the 0.2x0.3 region susceptible to instabilities and distortions. Our results point toward the presence of an incommensurate CDW above T d =220 K. This work strengthens prevalent thought that intercalation contributes significantly to instabilities in the lattice and charge degrees of freedom in layered chalcogenides. Further work is required to uncover additional density wave transitions, and possible ground states such as superconductivity.

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Section: Further Discussionsupporting

confidence: 91%

Possible lattice and charge order in Cu_xBi₂Te₂Se

Smith

Rexhausen

et al. 2019

J. Phys. Mater.

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“…Less than a decade ago, CDW formation at ∼95 K was reported, even if in passing, for a closely related material, LaAuSb 2 [27]. This work was followed by recent (magneto-) electrical and thermal transport studies, as well as ultrafast pump-probe spectroscopy measurements, on LaAuSb 2 [28] providing evidence for partial gapping of the Fermi surfaces during the CDW transition at around 88 K. Additionally, resistivity data for several samples of the La(Ag 1−x Au x )Sb 2 series were reported [25], indicating suppression of the CDW transition with Au substitution (only one CDW transition was detected). In this work the Au-end compound had T CDW = 88 K and was designated as LaAu 0.88 Sb 2 .…”

Section: Introductionmentioning

confidence: 91%

“…Indeed, in contrast to the stoichiometric RAgSb 2 series [16,29], the RAuSb 2 family (in particular more thoroughly studied CeAuSb 2 ) was suspected to have transition metal deficiency [27,30]. Different Au occupancies, x, on the single Au site, Au 2b, are most probably responsible for different values of the observed T CDW as well as the range of residual resistivity ratios (RRR) in LaAu x Sb 2 [25,27,28].…”

Section: Introductionmentioning

confidence: 99%

Tuning of charge density wave transitions in LaAuxSb2 by pressure and Au stoichiometry

Ryan

Straszheim

et al. 2020

Phys. Rev. B

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Two charge density wave transition can be detected in LaAuSb2 at similar to 110 and similar to 90K by careful electrical transport measurements. Whereas control of the Au site occupancy in LaAuxSb2 (for 0.9 less than or similar to x less than or similar to 1.0) can suppress each of these transitions by similar to 80K, the application of hydrostatic pressure can completely suppress the lower transition by similar to 7.5kbar and the upper transition by similar to 17kbar. Clear anomalies in the resistance as well as the magnetoresistance are observed to coincide with the pressures at which the charge density wave transitions are driven to zero.

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“…RT Sb 2 (R = rare earth, T = Cu, Ag, Au) compounds with ZrCuSi 2 -type tetragonal structure (P 4/nmm) [1], depending on R and T element, show various phenomena such as charge density wave (CDW) (LaAgSb 2 [2], LaAuSb 2 [3][4][5]), superconductivity (LaCuSb 2 [6]), ferromagnetism(CeAgSb 2 [7]), and antiferromagnetism (CeCuSb 2 [6], CeAuSb 2 [8]). It is important to understand the origins of these properties based on differences in R 4f electron number and crystal structure such as bond length and angle.…”

Section: Introductionmentioning

confidence: 99%

“…The effect on the CDW transition of RT Sb 2 due to T and R substitution was studied and T CDW was found to correlate strongly with the distance between Sb planes around the T site [4]. Kuo et al have recently studied the CDW transition of LaAuSb 2 further by Hall coefficient, Seebeck coefficient, thermal conductivity, and ultrafast pump-probe spectroscopy measurements [5]. They concluded that partial gapping of the Fermi surfaces occurs during the CDW phase transition.…”

Section: Introductionmentioning

confidence: 99%

Electronic States of LaAuSb₂ Studied by Soft X-Ray ARPES

Imada

Tsukamura

Terashima

et al. 2020

Proceedings of the International Conference on Strongly Correlated Electron Systems (SCES2019)

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Electronic band structure of LaAuSb 2 , which shows charge density wave (CDW) transition, is studied above the CDW transition temperature by means of soft X-ray angle resolved photoemission and the result was compared with the band structure calculation. Inner potential was estimated as 25 eV based on the photon energy dependence of the ARPES result. Resonance enhancement of La 4f component in the occupied bands has been found the La 3d → 4f photoabsorption edge. Experimentally found dispersions at least partially agreed with the band structure calculation.

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Characterization of the charge density wave transition and observation of the amplitude mode in LaAuSb2

Cited by 23 publications

References 34 publications

Possible lattice and charge order in Cu_xBi₂Te₂Se

Possible lattice and charge order in Cu_xBi₂Te₂Se

Tuning of charge density wave transitions in LaAuxSb2 by pressure and Au stoichiometry

Electronic States of LaAuSb₂ Studied by Soft X-Ray ARPES

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Characterization of the charge density wave transition and observation of the amplitude mode in LaAuSb2

Cited by 23 publications

References 34 publications

Possible lattice and charge order in CuxBi2Te2Se

Possible lattice and charge order in CuxBi2Te2Se

Tuning of charge density wave transitions in LaAuxSb2 by pressure and Au stoichiometry

Electronic States of LaAuSb2 Studied by Soft X-Ray ARPES

Contact Info

Product

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Possible lattice and charge order in Cu_xBi₂Te₂Se

Possible lattice and charge order in Cu_xBi₂Te₂Se

Electronic States of LaAuSb₂ Studied by Soft X-Ray ARPES