Sb2Se3 under pressure

Efthimiopoulos, Ilias; Zhang, Jiaming; Kucway, Melvin; Park, Changyong; Ewing, Rodney C.; Wang, Yuejian

doi:10.1038/srep02665

Cited by 104 publications

(123 citation statements)

References 52 publications

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“…Apparently, the rapid increase of T C of the superconductive phase from 10 GPa to 18 GPa is intimately related to the increase of carrier density, as observed in Bi 2 Te 3 21, Bi 2 Se 3 1322 or Sb 2 Te 3 12 systems. The difference is that all these phenomena of Sb 2 Se 3 occur within the initial ambient crystal structure31 (see Supplementary Fig. S1 online), other than pressure induced crystal structure changes in Bi 2 Te 3 , Bi 2 Se 3 or Sb 2 Te 3 compounds.…”

Section: Resultsmentioning

confidence: 99%

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Superconductivity in Strong Spin Orbital Coupling Compound Sb2Se3

Kong

Sun

et al. 2014

Sci Rep

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Recently, A2B3 type strong spin orbital coupling compounds such as Bi2Te3, Bi2Se3 and Sb2Te3 were theoretically predicated to be topological insulators and demonstrated through experimental efforts. The counterpart compound Sb2Se3 on the other hand was found to be topological trivial, but further theoretical studies indicated that the pressure might induce Sb2Se3 into a topological nontrivial state. Here, we report on the discovery of superconductivity in Sb2Se3 single crystal induced via pressure. Our experiments indicated that Sb2Se3 became superconductive at high pressures above 10 GPa proceeded by a pressure induced insulator to metal like transition at ~3 GPa which should be related to the topological quantum transition. The superconducting transition temperature (TC) increased to around 8.0 K with pressure up to 40 GPa while it keeps ambient structure. High pressure Raman revealed that new modes appeared around 10 GPa and 20 GPa, respectively, which correspond to occurrence of superconductivity and to the change of TC slop as the function of high pressure in conjunction with the evolutions of structural parameters at high pressures.

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Section: Resultsmentioning

confidence: 99%

“…The Sb 2 Se 3 crystallizes in space group Pbnm 283132 at ambient condition and sketch of the coordination environment around the Sb1 and Sb2 cations is shown in Supplementary Fig. S2 (a) online.…”

Section: Resultsmentioning

confidence: 99%

Superconductivity in Strong Spin Orbital Coupling Compound Sb2Se3

Kong

Sun

et al. 2014

Sci Rep

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“…17 Similarly, TQPT has been claimed in Sb2Se3 (SG: Pnma, Eg = 1 eV) at ~ 2.5 GPa by studying the vibrational phonon and electrical resistivity anomalies together with the first principles calculations, 11,15 though there is also an alternate interpretation suggested. 18 Recently, Ohmura et al, showed that bismuth tellurihalide BiTeBr (S.G: P3m1, Eg = 0.55 eV) undergoes a TQPT at 2.5  3.0 GPa using resistivity and synchrotron XRD measurements under pressure. 10 The above examples provide strong basis for using such indirect methods to study pressure induced TQPT in the SOC systems.…”

Section: Introductionmentioning

confidence: 99%

Structural, vibrational, and electrical properties of 1T−TiTe2 under hydrostatic pressure: Experiments and theory

et al. 2018

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We report the structural, vibrational and electrical transport properties up to ~ 16 GPa of the 1T-TiTe2, a prominent layered 2D system, which is predicted to show a series of topologically trivial -nontrivial transitions under hydrostatic compression. We clearly show signatures of two iso-structural transition at ~ 2 GPa and ~ 4 GPa obtained from the minima in c/a ratio concomitant with the phonon linewidth anomalies of Eg and A1g modes at around the same pressures, providing strong indication of unusual electron-phonon coupling associated to these transitions. Resistivity presents nonlinear behavior over similar pressure ranges providing a strong indication of the electronic origin of these pressure driven isostructural transitions. Our data thus provide clear evidences of topological changes at A and L point of the Brillouin zone predicted to be present in the compressed 1T-TiTe2. Between 4 GPa and ~ 8 GPa, the c/a ratio shows a plateau suggesting a transformation from an anisotropic 2D layer to a quasi 3D crystal network. First principles calculations suggest that the 2D to quasi 3D evolution without any structural phase transitions is mainly due to the increased interlayer Te-Te interactions (bridging) via the charge density overlap. In addition to the pressure dependent isostructural phase transitions, our data also evidences the occurrence of a first order structural phase transition from the trigonal (P3 ̅ m1) phase at higher pressures. We estimate the start of this structural phase transition to be ~ 8 GPa and the symmetric of the new high-pressure phase to be monoclinic (C2/m).2

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“…There are two nonequivalent Sb cation sites in this phase. One of the Sb cations is coordinated by seven Se anions and the coordination around the second Sb site can be described as (7+1) with respect to the Se ions [9].…”

Section: Introductionmentioning

confidence: 99%

DFT Study on the Carrier Concentration and Temperature-Dependent Thermoelectric Properties of Antimony Selenide

Jayaraman

Kademane

Molli

2016

Indian Journal of Materials Science

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We present the thermoelectric properties of Antimony Selenide (Sb 2 Se 3 ) obtained using first principles calculations. We investigated the electronic band structure using the FP-LAPW method within the sphere of the density functional theory. Thermoelectric properties were calculated using BoltzTrap code using the constant relaxation time ( ) approximation at three different temperatures 300 K, 600 K, and 800 K. Seebeck coefficient ( ) was found to decrease with increasing temperature, electrical conductivity ( / ) was almost constant in the entire temperature range, and electronic thermal conductivity ( / ) increased with increasing temperature. With increase in temperature decreased from 1870 V/K (at 300 K) to 719 V/K (at 800 K), electronic thermal conductivity increased from 1.56 × 10 15 W/m K s (at 300 K) to 3.92 × 10 15 W/m K s (at 800 K), and electrical conductivity decreased from 22 × 10 19 /Ω m s (at 300 K) to 20 × 10 19 /Ω m s (at 800 K). The thermoelectric properties were also calculated for different hole concentrations and the optimum concentration for a good thermoelectric performance over a large range of temperatures (from 300 K to 1000 K) was found for hole concentration around 10 19 cm −3 .

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Sb2Se3 under pressure

Cited by 104 publications

References 52 publications

Superconductivity in Strong Spin Orbital Coupling Compound Sb2Se3

Superconductivity in Strong Spin Orbital Coupling Compound Sb2Se3

Structural, vibrational, and electrical properties of 1T−TiTe2 under hydrostatic pressure: Experiments and theory

DFT Study on the Carrier Concentration and Temperature-Dependent Thermoelectric Properties of Antimony Selenide

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