Superconductivity in a Misfit Phase That Combines the Topological Crystalline Insulator Pb1-xSnxSe with the CDW-Bearing Transition Metal Dichalcogenide TiSe2
- Princeton Univ., NJ (United States)
- Brown Univ., Providence, RI (United States)
- Brookhaven National Lab. (BNL), Upton, NY (United States); Princeton Univ., NJ (United States)
- Brookhaven National Lab. (BNL), Upton, NY (United States)
We report the characterization of the misfit compound (Pb1-xSnxSe2)1.16(TiSe2)2 for 0 ≤ x ≤ 0.6, in which a [100] rocksalt-structure bilayer of Pb1-xSnxSe, which is a topological crystalline insulator in bulk form, alternates with a double layer of the normally nonsuperconducting transition metal dichalcogenide TiSe2. The x dependence of Tc displays a weak dome-like shape with a maximum Tc of 4.5 K at x = 0.2; there is only a subtle change in Tc at the composition where the trivial to topological transition occurs in bulk Pb1-xSnxSe. We present the characterization of the superconductor at x = 0.4, for which the bulk Pb1-xSnxSe phase is in the topological crystalline insulator regime. For this material, the Sommerfeld parameter γ = 11.06 mJ mol-1 K-2, the Debye temperature ΘD = 161 K, the normalized specific heat jump value ΔC/γTc = 1.38 and the electron-phonon constant value γep = 0.72, suggesting that (Pb0.6Sn0.4Se)1.16(TiSe2)2 is a BCS-type weak coupling superconductor. This material may be of interest for probing the interaction of superconductivity with the surface states of a topological crystalline insulator.
- Research Organization:
- Brookhaven National Lab. (BNL), Upton, NY (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- SC00112704
- OSTI ID:
- 1303012
- Report Number(s):
- BNL-112487-2016-JA; R&D Project: PO016; KC0202020
- Journal Information:
- Journal of the Physical Society of Japan, Vol. 85, Issue 6; ISSN 0031-9015
- Publisher:
- Physical Society of JapanCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Superconductivity in a misfit layered compound (SnSe) 1.16 (NbSe 2 )
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journal | August 2018 |
Superconductivity in a misfit compound (PbSe) 1.12 (TaSe 2 )
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journal | November 2018 |
Multi-band Superconductivity in a misfit layered compound (SnSe) 1.16 (NbSe 2 ) 2
|
journal | January 2020 |
| Superconductivity in a misfit layered compound (SnSe)$_{1.16}$(NbSe$_2$) | text | January 2018 |
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