2017
DOI: 10.1002/pssb.201700007
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Bi‐centric view of the isostructural phase transitions in α‐Bi2Se3 and α‐Bi2Te3

Abstract: Te 3 ) have been reported to exhibit a pressure-induced isostructural phase transition (IPT) in the low-pressure region (<5 GPa); however, the underlying mechanism is not fully understood yet. Here, we comparatively investigated the IPTs in a-Bi 2 Se 3 and a-Bi 2 Te 3 using high-pressure Bi L 3 -edge X-ray absorption fine structure spectroscopy, complemented with density functional theory (DFT) calculation. Near the IPT, the slope of the Bi L 3 -edge absorption energy shows a sudden decrease. In contrast to th… Show more

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Cited by 12 publications
(9 citation statements)
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“…1c and 1d, 4b and 4c) in Phase I. The similar behaviours were also observed in the other V 2 -VI 3 compounds with topological insulating states 51,52,63,64,66 .…”
Section: Online Contentsupporting
confidence: 81%
“…1c and 1d, 4b and 4c) in Phase I. The similar behaviours were also observed in the other V 2 -VI 3 compounds with topological insulating states 51,52,63,64,66 .…”
Section: Online Contentsupporting
confidence: 81%
“…1), and near 6-7 GPa or somewhat above they all undergo a phase transition to the monoclinic C2/m lattice. 30,53,[75][76][77][78][79][80][81][82][83][84][85][86][87][88][89][90][91] As shown by studies on high-quality single crystals of Bi 2 Te 3 , the pressure behavior of its Seebeck coefficient depends strongly on carrier concentration. 51,53 For example, in undoped p-type crystals with carrier concentrations of about 10 17 cm −3 and below, an applied pressure of 2-4 GPa induces a double p-n-p sign inversion [ p-Bi 2 Te 3 (1) in Fig.…”
Section: A (Bisb) 2 (Tese) 3 Thermoelectricsmentioning
confidence: 99%
“…4(a)], an n-p sign inversion can be observed just before the phase transition to the C2/m lattice near 6-7 GPa. [75][76][77][78][79][80][81][82][83][84][85] These anomalies and the n-p sign inversions can be linked to particular changes in band structure and to redistribution of charge carriers between different bands. 97,98 For polycrystalline samples of n-Bi 2 Te 3 , p-BiSbTe 3 , and p-Sb 2 Te 3 , the thermopower curves do not exhibit any particular FIG.…”
Section: A (Bisb) 2 (Tese) 3 Thermoelectricsmentioning
confidence: 99%
“…They included, for example, 2D electronic topological Lifshitz transition, 45 the emergence of superconductivity, [146][147][148] giant enhancement of thermoelectric power factor, 149,150 and also spectacular changes in the bulk mechanical, 45,151,152 electronic, [153][154][155] vibrational, and other properties. [156][157][158][159] Above 6-8 GPa, the original rhombohedral phase transforms to a monoclinic C2/m structure. 22,146,148,151,157,158,[160][161][162][163][164][165] Here, we investigated a possibility of pressure-driven p-n conductivity switching in Bi 2 Te 3 .…”
Section: Bi 2 Tementioning
confidence: 99%
“…This result is in . On the phase transition to the C2/ m phase at ∼6-8 GPa, 22,146,148,151,[157][158][159][160][161][162][163]166 the residual minor bandgap of Bi 2 Te 3 is abruptly closed, and its electrical resistance drops [Fig. 5(c)].…”
Section: Bi 2 Tementioning
confidence: 99%