Superconductivity in a Misfit Phase That Combines the Topological Crystalline Insulator Pb1-xSnxSe with the CDW-Bearing Transition Metal Dichalcogenide TiSe2

doi:10.7566/JPSJ.85.064705

Title: Superconductivity in a Misfit Phase That Combines the Topological Crystalline Insulator Pb_1-xSn_xSe with the CDW-Bearing Transition Metal Dichalcogenide TiSe₂

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Abstract

We report the characterization of the misfit compound (Pb_1-xSn_xSe₂)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 Θ_D = 161 K, the normalized specific heat jump value ΔC/γT_c = 1.38 and the electron-phonon constant value γ_ep = 0.72, suggesting that (Pb_0.6Sn_0.4Se)_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.

Authors:

Luo, H. ^[1]; Yan, K. ^[2]; Pletikosic, I. ^[3]; Xie, W. ^[1]; Phelan, B. F. ^[1]; Valla, T. ^[4]; Cava, R. J. ^[1]

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)

Publication Date:: 2016-05-13

Research Org.:: Brookhaven National Lab. (BNL), Upton, NY (United States)

Sponsoring Org.:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

OSTI Identifier:: 1303012

Report Number(s):: BNL-112487-2016-JA
Journal ID: ISSN 0031-9015; R&D Project: PO016; KC0202020

Grant/Contract Number:: SC00112704

Resource Type:: Accepted Manuscript

Journal Name:: Journal of the Physical Society of Japan

Additional Journal Information:: Journal Volume: 85; Journal Issue: 6; Journal ID: ISSN 0031-9015

Publisher:: Physical Society of Japan

Country of Publication:: United States

Language:: English

Subject:: 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; Topological insulator; Transition Metal Dichalcogenide; Superconductivity; Misfit phase

Citation Formats


                    Luo, H., Yan, K., Pletikosic, I., Xie, W., Phelan, B. F., Valla, T., and Cava, R. J. Superconductivity in a Misfit Phase That Combines the Topological Crystalline Insulator Pb1-xSnxSe with the CDW-Bearing Transition Metal Dichalcogenide TiSe2.  United States: N. p., 2016. 
        Web.  doi:10.7566/JPSJ.85.064705.

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                    Luo, H., Yan, K., Pletikosic, I., Xie, W., Phelan, B. F., Valla, T., & Cava, R. J. Superconductivity in a Misfit Phase That Combines the Topological Crystalline Insulator Pb1-xSnxSe with the CDW-Bearing Transition Metal Dichalcogenide TiSe2.  United States.  doi:10.7566/JPSJ.85.064705.

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                    Luo, H., Yan, K., Pletikosic, I., Xie, W., Phelan, B. F., Valla, T., and Cava, R. J. Fri .  
        "Superconductivity in a Misfit Phase That Combines the Topological Crystalline Insulator Pb1-xSnxSe with the CDW-Bearing Transition Metal Dichalcogenide TiSe2".  United States.  doi:10.7566/JPSJ.85.064705.  https://www.osti.gov/servlets/purl/1303012.

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@article{osti_1303012,

  title        = {Superconductivity in a Misfit Phase That Combines the Topological Crystalline Insulator Pb1-xSnxSe with the CDW-Bearing Transition Metal Dichalcogenide TiSe2},

  author       = {Luo, H. and Yan, K. and Pletikosic, I. and Xie, W. and Phelan, B. F. and Valla, T. and Cava, R. J.},

  abstractNote = {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.},

  doi          = {10.7566/JPSJ.85.064705},

  journal      = {Journal of the Physical Society of Japan},

  number       = 6,

  volume       = 85,

  place        = {United States},

  year         = {2016},

  month        = {5}

}

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Title: Superconductivity in a Misfit Phase That Combines the Topological Crystalline Insulator Pb1-xSnxSe with the CDW-Bearing Transition Metal Dichalcogenide TiSe2

Abstract

Citation Formats

Title: Superconductivity in a Misfit Phase That Combines the Topological Crystalline Insulator Pb_1-xSn_xSe with the CDW-Bearing Transition Metal Dichalcogenide TiSe₂