Full superconducting gap in the candidate topological superconductor In${}_{1-x}$Pb${}_x$Te for x = 0.2

Abstract

High-pressure synthesis techniques have allowed for the growth of samples on the indium-rich side of (Pb,In)Te, which have increased superconducting transition temperatures compared to lead-rich compounds. In this study we present measurements of the temperature dependence of the London penetration depth $\Delta \lambda (T)$ in the compound In${}_{0.8}$Pb${}_{0.2}$Te, which shows a bulk $T_{c,onset}$ of $\sim 4.75$ K. The results indicate fully gapped BCS-like behavior, ruling out odd-parity, topologically nontrivial $A_{2u}$ pairing; however, odd-parity $A_{1u}$ pairing is still possible. Critical field values measured below 1 K and other superconducting parameters are also presented.

arXiv comment8 pages, 9 figures

References in corpus (35)

• Topological Insulators in Three Dimensions
• Discovery (theoretical prediction and experimental observation) of a large-gap topological-insulator class with spin-polarized single-Dirac-cone on the surface
• First observation of Spin-Momentum Helical Locking in Bi2Se3 and Bi2Te3, demonstration of Topological-Order at 300K and a realization of topological-transport-regime
• Search for Majorana fermions in superconductors
• Topological Crystalline Insulators in the SnTe Material Class
• Superconductivity in CuxBi2Se3 and its implications for pairing in the undoped topological insulator
• Experimental realization of a topological crystalline insulator in SnTe
• Odd-Parity Topological Superconductors: Theory and Application to Cu${}_x$Bi${}_2$Se${}_3$
• A topological crystalline insulator (TCI) phase via topological phase transition and crystalline mirror symmetry
• Observation of topological order in a Superconducting doped topological insulator (based on the Bi2Se3 class)
• Magnetic Penetration Depth in Unconventional Superconductors
• Superconductivity with topological surface state in SrxBi2Se3
• Odd-parity topological superconductor with nematic order: Application to CuxBi2Se3
• Odd-Parity Pairing and Topological Superconductivity in a Strongly Spin-Orbit Coupled Semiconductor
• Exponential Temperature Dependence of Penetration Depth in Single Crystal MgB_2
• Tunability of the k-space Location of the Dirac Cones in the Topological Crystalline Insulator Pb1-xSnxTe
• Penetration depth study of superconducting gap structure of 2\textit{H}-NbSe${}_2$
• Unusual nature of fully-gapped superconductivity in In-doped SnTe
• Enhanced superconducting pairing interaction in indium-doped tin telluride
• Measurements of the absolute value of the penetration depth in high-$T_c$ superconductors using a tunnel diode resonator
• Nematic superconductivity in doped Bi2Se3 topological superconductors
• Fermiology of Strongly Spin-Orbit Coupled Superconductor Sn1-xInxTe and its Implication to Topological Superconductivity
• Optimizing the superconducting transition temperature and upper critical field of Sn(1-x)In(x)Te
• Absence of non-linear Meissner effect in YBa2Cu3O6.95
• Evidence of nodes in the order parameter of the superconducting doped topological insulator Nb${}_x$Bi${}_2$Se${}_3$ via penetration depth measurements
• Superconductivity induced by In substitution into the topological crystalline insulator Pb(0.5)Sn(0.5)Te
• Indium substitution effect on the topological crystalline insulator family (Pb${}_{1-x}$Sn${}_x$)${}_{1-y}$In${}_y$Te: Topological and superconducting properties
• Observation of surface states on heavily indium doped SnTe(111), a superconducting topological crystalline insulator
• Fully gapped superconductivity in In-doped topological crystalline insulator Pb${}_{0.5}$Sn${}_{0.5}$Te
• High-Pressure Synthesis and Superconductivity of Ag-doped Topological Crystalline Insulator SnTe (Sn1-xAgxTe with x = 0-0.5)
• Electronic structure and relaxation dynamics in a superconducting topological material
• Superconductivity, pairing symmetry, and disorder in the doped topological insulator Sn${}_{1-x}$In${}_x$Te for x $\ge$ 0.10
• Unusual phonon density of states and response to the superconducting transition in the In-doped topological crystalline insulator Pb${}_{0.5}$Sn${}_{0.5}$Te
• Electron-phonon coupling and superconductivity in the doped topological-crystalline insulator (Pb${}_{0.5}$Sn${}_{0.5}$)${}_{1-x}$In${}_x$Te
• Nodeless superconducting gap in the candidate topological superconductor Sn${}_{1-x}$In${}_x$Te for x = 0.7

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