1. Superconductivity in the orthorhombic phase of thermoelectric CsPbxBi4−xTe6 with 0.3≤x≤1.0.
- Author
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Zhang, R.X., Yang, H.X., Tian, H.F., Chen, G.F., Wu, S.L., Wei, L.L., and Li, J.Q.
- Subjects
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SUPERCONDUCTIVITY , *ORTHORHOMBIC crystal system , *THERMOELECTRIC materials , *ELECTRICAL resistivity , *MAGNETIC susceptibility - Abstract
Experimental measurements clearly reveal the presence of bulk superconductivity in the CsPb x Bi 4− x Te 6 (0.3≤ x ≤1.0) materials, i.e. the first member of the thermoelectric series of Cs[Pb m Bi 3 Te 5+ m ], these materials have the layered orthorhombic structure containing infinite anionic [PbBi 3 Te 6 ] − slabs separated with Cs + cations. Temperature dependences of electrical resistivity, magnetic susceptibility, and specific heat have consistently demonstrated that the superconducting transition in Cs 0.96 Pb 0.25 Bi 3.75 Te 6.04 occurs at T c =3.1 K, with a superconducting volume fraction close to 100% at 1.8 K. Structural study using aberration-corrected STEM/TEM reveals a rich variety of microstructural phenomena in correlation with the Pb-ordering and chemical inhomogeneity. The superconducting material Cs 0.96 Pb 0.25 Bi 3.75 Te 6.04 with the highest T c shows a clear ordered structure with a modulation wave vector of q ≈ a */2+ c */1.35 on the a – c plane. Our study evidently demonstrates that superconductivity deriving upon doping of narrow-gap semiconductor is a viable approach for exploration of novel superconductors. [ABSTRACT FROM AUTHOR]
- Published
- 2015
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