Superconductivity in a misfit phase that combines the topological crystalline insulator Pb1-xSnxSe with the CDW-bearing transition metal dichalcogenide TiSe2

Huixia Luo, Kai Yan, Ivo's Pletikosic, Weiwei Xie, Brendan F. Phelan, Tonica Valla, Robert J. Cava

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Abstract

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 non-superconducting transition metal dichalcogenide TiSe2. The x dependence of Tcdisplays 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 λep = 0.72, suggesting that (Pb0.6-Sn0.4Se)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.

Original languageEnglish (US)
Article number064705
JournalJournal of the Physical Society of Japan
Volume85
Issue number6
DOIs
StatePublished - Jun 15 2016

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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