Anisotropic superconductivity in the noncentrosymmetric BiPd

Abstract

We report measurements of London penetration depth $\lambda (T)$ for the noncentrosymmetric superconductor BiPd by using a tunnel diode oscillator. Pronounced anisotropic behavior is observed in the low-temperature penetration depth; the in-plane penetration depth ${\lambda }_{ac}(T)$ follows an exponential decrease, but the interplane penetration depth ${\lambda }_b(T)$ shows power-law-type behavior. The superfluid density ${\rho }_s(T)$, converted from the penetration depth $\lambda (T)$, is best fitted by an anisotropic two-band BCS model. We argue that such a complex order parameter is attributed to the admixture of spin-singlet and spin-triplet pairing states as a result of antisymmetric spin-orbit coupling in BiPd.

5 pages, 4 figure, to be published in Phys. Rev. B (Rapid Communication)

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• Spin-triplet pairing state evidenced by half-quantum flux in a noncentrosymmetric superconductor
• NbIr${}_2$B${}_2$ and TaIr${}_2$B${}_2$ -- new low symmetry noncentrosymmetric superconductors with strong spin orbit coupling
• Electron-phonon coupling and pairing mechanism in $\beta$--Bi${}_2$Pd centrosymmetric superconductor
• Controllable spin-orbit coupling and its influence on the upper critical field in the chemically doped quasi-one-dimensional Nb${}_2$PdS${}_5$ superconductor
• Probing the superconducting gap symmetry of $\alpha$-PdBi${}_2$: A penetration depth study
• Upper critical field of the noncentrosymmetric superconductor BiPd
• Fully-gapped superconductivity in single crystals of noncentrosymmetric Re${}_6$Zr with broken time-reversal symmetry
• Unconventional superconducting properties of noncentrosymmetric Re5.5Ta
• Electronic structure, electron-phonon coupling and superconductivity in noncentrosymmetric ThCoC2 from ab initio calculations
• Anomalies in the core level spectroscopy of a noncentrosymmetric solid, BiPd
• Nodeless superconductivity in noncentrosymmetric LaRhSn
• A Family of Lanthanide Noncentrosymmetric Superconductors La${}_4$$TX$ ($T$ = Ru, Rh, Ir; $X$ = Al, In)
• Fermi surface and band structure of BiPd from ARPES studies
• Unconventional Pairings and Radial Line Nodes in Inversion Symmetry Broken Superconductors
• Temperature dependence of the lower critical field of the noncentrosymmetric superconductor $\alpha$-BiPd
• Discovery of the topological surface state in a noncentrosymmetric superconductor BiPd