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Superconductivity in strong spin orbital coupling compound Sb₂Se₃.

Kong PP, Sun F, Xing LY, Zhu J, Zhang SJ, Li WM, Liu QQ, Wang XC, Feng SM, Yu XH, Zhu JL, Yu RC, Yang WG, Shen GY, Zhao YS, Ahuja R, Mao HK, Jin CQ - Sci Rep (2014)

Bottom Line: 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.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.

View Article: PubMed Central - PubMed

Affiliation: Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.

ABSTRACT
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.

No MeSH data available.


The relation of electrical properties and structure as a function of pressure.(a) TC from two individual resistance measurement experiments, (b) the angles of  and , (c) a/b ratio and (d) Evolutions of Raman vibration modes as functions of pressures. The vertical shadowed boxes indicate the pressures for insulator-metal like-superconductors transitions and the change of TC slop as the function of high pressure, and all the solid and dotted lines are guidelines for your eyes.
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f5: The relation of electrical properties and structure as a function of pressure.(a) TC from two individual resistance measurement experiments, (b) the angles of and , (c) a/b ratio and (d) Evolutions of Raman vibration modes as functions of pressures. The vertical shadowed boxes indicate the pressures for insulator-metal like-superconductors transitions and the change of TC slop as the function of high pressure, and all the solid and dotted lines are guidelines for your eyes.

Mentions: To understand the pressure induced novel physical properties in terms of structural mechanism, we conducted in situ Raman spectra and angle resolved x-ray diffraction (AD-XRD) measurements at high pressures. The Sb2Se3 crystallizes in space group Pbnm283132 at ambient condition and sketch of the coordination environment around the Sb1 and Sb2 cations is shown in Supplementary Fig. S2 (a) online. The AD-XRD results (see Supplementary Fig. S1 online) reveal that Sb2Se3 maintains ambient-pressure phase within the pressure range in our experiment, consistent with the recent observation31. At this point, the ambient structure of Sb2Se3 stabilizes within entire pressure range we studied, indicating that insulator to metal like to superconducting transitions as increase of pressure are type of electronic phase changes related to local structure evolutions. Raman spectroscopy is sensitive to local bond vibrations and symmetric broken33343536, therefore it can provide evidence for the rich property evolution of Sb2Se3 under high pressure. As shown in Fig. 4, there are two new vibration modes appeared at 10 and 20 GPa, respectively, which agrees well with the reported results1431. Vibration modes of Raman spectra are fitted by Lorentzian peak configuration with pressure up to ~20 GPa, as plotted in Fig. 4. At ambient pressure, seven modes denoted as M1 (105 cm−1), M2 (122.6 cm−1), M3 (131 cm−1), M4 (155.2 cm−1), M5 (181 cm−1), M6 (189.6 cm−1) and M7 (213.3 cm−1) are clearly seen in Fig. 4 (a). The vibration modes as the function of pressure are fitted to the linear equation (dashed line) (Fig. 5 (d), except for M5 and M8 modes). M2 and M5 modes get softened around 2.5 GPa, while M6 and M7 modes almost keep constant. At ~10 GPa, M5 disappears accompanied by a new mode M8 showing up, where superconductivity occurs. Further increasing pressure to around 20 GPa, another new mode M9 is observed, which results in the change of increase rate of TC.


Superconductivity in strong spin orbital coupling compound Sb₂Se₃.

Kong PP, Sun F, Xing LY, Zhu J, Zhang SJ, Li WM, Liu QQ, Wang XC, Feng SM, Yu XH, Zhu JL, Yu RC, Yang WG, Shen GY, Zhao YS, Ahuja R, Mao HK, Jin CQ - Sci Rep (2014)

The relation of electrical properties and structure as a function of pressure.(a) TC from two individual resistance measurement experiments, (b) the angles of  and , (c) a/b ratio and (d) Evolutions of Raman vibration modes as functions of pressures. The vertical shadowed boxes indicate the pressures for insulator-metal like-superconductors transitions and the change of TC slop as the function of high pressure, and all the solid and dotted lines are guidelines for your eyes.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4202213&req=5

f5: The relation of electrical properties and structure as a function of pressure.(a) TC from two individual resistance measurement experiments, (b) the angles of and , (c) a/b ratio and (d) Evolutions of Raman vibration modes as functions of pressures. The vertical shadowed boxes indicate the pressures for insulator-metal like-superconductors transitions and the change of TC slop as the function of high pressure, and all the solid and dotted lines are guidelines for your eyes.
Mentions: To understand the pressure induced novel physical properties in terms of structural mechanism, we conducted in situ Raman spectra and angle resolved x-ray diffraction (AD-XRD) measurements at high pressures. The Sb2Se3 crystallizes in space group Pbnm283132 at ambient condition and sketch of the coordination environment around the Sb1 and Sb2 cations is shown in Supplementary Fig. S2 (a) online. The AD-XRD results (see Supplementary Fig. S1 online) reveal that Sb2Se3 maintains ambient-pressure phase within the pressure range in our experiment, consistent with the recent observation31. At this point, the ambient structure of Sb2Se3 stabilizes within entire pressure range we studied, indicating that insulator to metal like to superconducting transitions as increase of pressure are type of electronic phase changes related to local structure evolutions. Raman spectroscopy is sensitive to local bond vibrations and symmetric broken33343536, therefore it can provide evidence for the rich property evolution of Sb2Se3 under high pressure. As shown in Fig. 4, there are two new vibration modes appeared at 10 and 20 GPa, respectively, which agrees well with the reported results1431. Vibration modes of Raman spectra are fitted by Lorentzian peak configuration with pressure up to ~20 GPa, as plotted in Fig. 4. At ambient pressure, seven modes denoted as M1 (105 cm−1), M2 (122.6 cm−1), M3 (131 cm−1), M4 (155.2 cm−1), M5 (181 cm−1), M6 (189.6 cm−1) and M7 (213.3 cm−1) are clearly seen in Fig. 4 (a). The vibration modes as the function of pressure are fitted to the linear equation (dashed line) (Fig. 5 (d), except for M5 and M8 modes). M2 and M5 modes get softened around 2.5 GPa, while M6 and M7 modes almost keep constant. At ~10 GPa, M5 disappears accompanied by a new mode M8 showing up, where superconductivity occurs. Further increasing pressure to around 20 GPa, another new mode M9 is observed, which results in the change of increase rate of TC.

Bottom Line: 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.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.

View Article: PubMed Central - PubMed

Affiliation: Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.

ABSTRACT
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.

No MeSH data available.