Probing the topological surface states in superconducting Sn4Au single crystal: A magneto transport study

Abstract

Materials exhibiting bulk superconductivity along with magnetoresistance (MR) in their normal state have emerged as suitable candidates for topological superconductivity. In this article, we report a flux free method to synthesize single crystal of topological superconductor candidate Sn4Au. The phase purity and single crystalline nature are confirmed through various characterizations viz. X-Ray diffraction (XRD), field emission scanning electron microscopy (FESEM), selected Area electron diffraction (SAED), and transmission electron microscopy (TEM). Chemical states of the constituent element viz. Sn and Au are analyzed through X-Ray photoelectron spectroscopy (XPS). Superconductivity in synthesized Sn4Au single crystal is evident form R-T plot and critical field (Hc) is determined through R-H plot at 2K i.e., just below critical temperature Tc. A positive magnetoresistance (MR) is observed in R-H measurements at different temperatures above Tc, viz. at 3K, 5K, 10K and 20K. Further, the magnetoconductivity (MC) is analyzed by using Hikami-Larkin-Nagaoka (HLN) formalism, which signifies the presence of weak antilocalization (WAL) effect in Sn4Au. Angle dependent magneto-transport measurement has been performed to detect the origin of the observed WAL effect in Sn4Au single crystal. Normalized MC vs HcosTheta plot shows presence of topological surface states (TSS) in the studied system. It is evident that Sn4Au is a 2.6K topological superconductor.

arXiv comment25Pages Text + Figs: Submitted: J. Phys. Cond. Matt

References in corpus (32)

• Topological Insulators
• Topological insulators and superconductors
• Non-Abelian Anyons and Topological Quantum Computation
• Discovery (theoretical prediction and experimental observation) of a large-gap topological-insulator class with spin-polarized single-Dirac-cone on the surface
• Dirac semimetal in three dimensions
• Experimental Realization of a Three-Dimensional Dirac Semimetal
• Catalogue of Topological Electronic Materials
• Topological Crystalline Insulators and Topological Superconductors: From Concepts to Materials
• Gate-Voltage Control of Chemical Potential and Weak Anti-localization in Bismuth Selenide
• Impurity effect on weak anti-localization in the topological insulator Bi2Te3
• Thickness-independent transport channels in topological insulator Bi2Se3 thin films
• Discovery of Dirac Node Arcs in PtSn4
• Two-dimensional Transport Induced Linear Magneto-Resistance in Topological Insulator Bi${}_2$Se${}_3$ Nanoribbons
• Pi Berry phase and Zeeman splitting of TaP probed by high field magnetotransport measurements
• Fermiology and Superconductivity of Topological Surface States in PdTe${}_2$
• Weak Antilocalization Effect and Noncentrosymmetric Superconductivity in a Topologically Nontrivial Semimetal LuPdBi
• Surface dominated transport in single crystalline nanoflake devices of topological insulator Bi1.5Sb0.5Te1.8Se1.2
• Specific heat and $\mu$SR study on the noncentrosymmetric superconductor LaRhSi3
• Extremely large non-saturating magnetoresistance and ultrahigh mobility due to topological surface states in metallic Bi2Te3 topological insulator
• Extremely large magnetoresistance and Kohler's rule in PdSn4: a complete study of thermodynamic, transport and band structure properties
• Superconductivity in topologically nontrivial material Au2Pb
• Exotic Superconducting Properties in Topological Nodal Semimetal PbTaSe${}_2$
• Transition from semiconducting to metallic-like conducting and weak antilocalization effect in single crystals of LuPtSb
• Type-I superconductivity in PdTe${}_2$ probed by $\mu$SR
• Type-I superconductivity in KBi2 single crystals
• Large linear magnetoresistance in a new Dirac material BaMnBi2
• Low temperature saturation of phase coherence length in topological insulators
• Quantum oscillations and a non-trivial Berry phase in the noncentrosymmetric superconductor BiPd
• Electronic Band Structure and Superconducting Properties of SnAs
• Spin-Momentum Locked Topological Surface States, non-trivial Berry's phase and magnetoelectric quantization in topological insulators
• Protection of the surface states in topological insulators: Berry phase perspective
• Topological Superconductor AuSn4: A first principle study

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