Probing the superconducting gap symmetry of $\alpha$-PdBi${}_2$: A penetration depth study

Abstract

We report measurements of the in-plane London penetration depth $\lambda$ in single crystals of the $\alpha$-PdBi${}_2$ superconductor --- the $\alpha$-phase counterpart of the putative topological superconductor $\beta$-PdBi${}_2$, down to 0.35~K using a high-resolution tunnel-diode-based technique. Both $\lambda$ and superfluid density ${\rho }_s$ exhibit an exponential behavior for $T\le$ 0.35$T_c$, with $\Delta (0)/k_B{T}_c\sim$2.0, $\Delta C/\gamma T_c$$\sim$2.0 and $\lambda (0)$$\sim$140~nm, showing that $\alpha$-PdBi${}_2$ is a moderately-coupling, fully-gapped superconductor. The values of $\Delta (0)$ and $\Delta C/\gamma T_c$ are consistent with each other via strong-coupling corrections.

arXiv comment6 pages, 5 figures

References in corpus (27)

• Superconductivity in CuxBi2Se3 and its implications for pairing in the undoped topological insulator
• Superconducting 2D system with lifted spin degeneracy: Mixed singlet-triplet state
• Superconductivity and spin-orbit coupling in non-centrosymmetric materials: a review
• A Sharp Peak of the Zero-Temperature Penetration Depth at Optimal Composition in BaFe2(As1-xPx)2
• Bulk superconducting phase with a full energy gap in the doped topological insulator Cu_xBi_2Se_3
• Odd-Parity Pairing and Topological Superconductivity in a Strongly Spin-Orbit Coupled Semiconductor
• Meissner - London state in superconductors of rectangular cross-section in perpendicular magnetic field
• Superconducting Topological Surface States in Non-centrosymmetric Bulk Superconductor PbTaSe2
• Remarkable effects of disorder on superconductivity of single atomic layers of lead on silicon
• Topologically protected surface states in a centrosymmetric superconductor beta-PdBi2
• Low Temperature Penetration depth of κ-(ET)_2Cu[N(CN)_2]Br and κ-(ET)_2Cu(NCS)_2
• Probing the superconducting gap symmetry of PrOs${}_4$Sb${}_{12}$: A penetration depth study
• Dirac Surface States and Nature of Superconductivity in Noncentrosymmetric BiPd
• Superconductivity at 5.4 K in $\beta$-Bi${}_2$Pd
• Evidence of nodes in the order parameter of the superconducting doped topological insulator Nb${}_x$Bi${}_2$Se${}_3$ via penetration depth measurements
• Magnetic field dependence of the density of states in the multiband superconductor $\beta$-Bi${}_2$Pd
• Observation of the spin-polarized surface state in a noncentrosymmetric superconductor BiPd
• Non-Locality and Strong Coupling in the Heavy Fermion Superconductor CeCoIn${}_5$: A Penetration Depth Study
• Single gap superconductivity in beta-Bi2Pd
• Anisotropic superconductivity in the noncentrosymmetric BiPd
• Fully gapped superconductivity in the topological superconductor beta-PdBi2
• Probing the superconducting gap symmetry of PrRu${}_4$Sb${}_{12}$: A comparison with PrOs${}_4$Sb${}_{12}$
• Structural origin of the anomalous temperature dependence of the local magnetic moments in the CaFe${}_2$As${}_2$ family of materials
• Anisotropic s-wave superconductivity in single crystals CaAlSi from penetration depth measurements
• Doping - dependent anisotropic superconducting gap in Na${}_{1-\delta }$(Fe${}_{1-x}$Co${}_x$)As
• Evolution of superconducting order in Pr(Os${}_{1-x}$Ru${}_x$)${}_4$Sb${}_{12}$
• Unusual temperature dependence of the London penetration depth in all-organic β``-(ET)_2SF_5CH_2CF_2SO_3 single crystals

Cited by in corpus (8)

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• Dirac State in a Centrosymmetric Superconductor alpha-PdBi2
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• Unconventional pressure dependence of the superfluid density in the nodeless topological superconductor $\alpha$-PdBi${}_2$
• Low-Energy Surface States in the Normal State of $\alpha$-PdBi2 Superconductor
• Superconductivity in Bi based Bi2PdPt
• Ab initio study of orbital-selective superconductivity in $\gamma$-BiPd