Single gap superconductivity in beta-Bi2Pd

Abstract

beta-Bi2Pd compound has been proposed as another example of a multi-gap superconductor [Y. Imai et al., J. Phys. Soc. Jap. 81, 113708 (2012)]. Here, we report on measurements of several important physical quantities capable to show a presence of multiple energy gaps on our superconducting single crystals of beta-Bi2Pd with the critical temperature Tc close to 5 K. The calorimetric study via a sensitive ac technique shows a sharp anomaly at the superconducting transition, however only a single energy gap is detected. Also other characteristics inferred from calorimetric measurements as the field dependence of the Sommerfeld coefficient and the temperature and angular dependence of the upper critical magnetic field point unequivocally to standard single s-wave gap superconductivity. The Hall-probe magnetometry provides the same result from the analysis of the temperature dependence of the lower critical field. A single-gapped BCS density of states is detected by the scanning tunneling spectroscopy measurements. Then, the bulk as well as the surface sensitive probes evidence a standard conventional superconductivity in this system where the topologically protected surface states have been recently detected by ARPES [M. Sakano et al., Nature Comm. 6, 8595 (2015)] .

7 pages, 4 figures, 1 table

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• Observation of Half-Quantum Flux in Unconventional Superconductor $\beta$-Bi${}_2$Pd
• Fully gapped superconductivity in the topological superconductor beta-PdBi2
• Synthesis, characterization and physical properties of layered bismuthide PtBi${}_2$
• Electron-phonon coupling and pairing mechanism in $\beta$--Bi${}_2$Pd centrosymmetric superconductor
• Probing the superconducting gap symmetry of $\alpha$-PdBi${}_2$: A penetration depth study
• Observation of a gel of quantum vortices in a superconductor at very low magnetic fields
• Tilted vortex cores and superconducting gap anisotropy in 2H-NbSe2
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• Topological Phase Transition Under Pressure in the Topological Nodal Line Superconductor PbTaSe${}_2$
• Transport evidence for three dimensional topological superconductivity in doped $\beta$-PdBi${}_2$
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• Subsurface bending and reorientation of tilted vortex lattices in the bulk due to Coulomb-like repulsion at the surface
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• Low-Energy Surface States in the Normal State of $\alpha$-PdBi2 Superconductor
• Superconductivity in Bi based Bi2PdPt
• Low-temperature thermal expansion of the topological material candidates $\beta$-PtBi${}_2$ and $\beta$-Bi${}_2$Pd
• Diluted Yu-Shiba-Rusinov arrays on the $\beta$-Bi${}_2$Pd anisotropic superconductor
• Unconventional superconductivity in the strong-coupling limit for the heavy fermion system CeCoIn${}_5$
• Direct observation of the surface superconducting gap in the topological superconductor candidate β-PdBi2
• Unconventional magnetization in the multiphase superconductor PdBi${}_2$
• Temperature dependence of the lower critical field of the noncentrosymmetric superconductor $\alpha$-BiPd
• Single-gap superconductivity in Mo${}_8$Ga${}_{41}$
• Ab initio study of orbital-selective superconductivity in $\gamma$-BiPd
• Superconductivity in centrosymmetric topological superconductor candidate TaC