Observation of Andreev bound state and multiple energy gaps in the non-centrosymmetric superconductor BiPd

Abstract

We report directional point contact Andreev reflection (PCAR) measurements on high-quality single crystals of the non-centrosymmetric superconductor, BiPd. The PCAR spectra measured on different crystallographic faces of the single crystal clearly show the presence of multiple superconducting energy gaps. For point contacts with low resistance, in addition to the superconducting gap feature, a pronounced zero bias conductance peak is observed. These observations provide strong evidence of the presence of unconventional order parameter in this material.

arXiv commentpdf file with figure (some corrections done, supplementary material added)

References in corpus (27)

• Heavy fermion superconductivity and magnetic order in non-centrosymmetric $CeP{t}_{3}Si$
• Superconducting 2D system with lifted spin degeneracy: Mixed singlet-triplet state
• Superconductivty without inversion symmetry: MnSi versus CePt_3Si
• Topological Phases of Noncentrosymmetric Superconductors: Edge States, Majorana Fermions, and the Non-Abelian Statistics
• S-wave/spin-triplet order in superconductors without inversion symmetry: Li${}_2$Pd${}_3$B and Li${}_2$Pt${}_3$B
• Spin Triplet Superconducting State due to Broken Inversion Symmetry in Li_2Pt_3B
• Andreev bound states in high-$T_c$ superconducting junctions
• Direct evidence for two-band superconductivity in MgB_2 single crystals from directional point-contact spectroscopy in magnetic fields
• Probing multiband superconductivity by point-contact spectroscopy
• Topological spin-current in non-centrosymmetric superconductors
• Electron Correlation and Pairing States in Superconductors without Inversion Symmetry
• The role of critical current on point contact Andreev Reflection spectrum between a normal metal and a superconductor
• Theoretical aspects of Andreev spectroscopy and tunneling spectroscopy in non-centrosymmetric superconductors: a topical review
• Edge states of Sr${}_2$RuO${}_4$ detected by in-plane tunneling spectroscopy
• Anomalous Andreev bound state in non-centrosymmetric superconductors
• Types of topological surface states in nodal noncentrosymmetric superconductors
• Surface density of states and topological edge states in non-centrosymmetric superconductors
• Penetration depth and tunneling studies in very thin epitaxial NbN films
• Surface bound states and spin currents in non-centrosymmetric superconductors
• Physical properties of the noncentrosymmetric superconductor Mg_10Ir_19B_16
• Nodal Structure of Superconductors with Time-Reversal Invariance and Z2 Topological Number
• Andreev bound states and tunneling characteristics of a non-centrosymmetric superconductor
• Evidence for gap anisotropy in CaC6 from directional point-contact spectroscopy
• Evidence of gap anisotropy in superconducting YNi2B2C using directional point contact spectroscopy
• Point-contact spectroscopy of the heavy-fermion superconductor CePt${}_3$Si
• Ginzburg-Landau theory of noncentrosymmetric superconductors
• Manifestation of helical edge states as zero-bias magneto-tunneling-conductance peaks in non-centrosymmetric superconductors

Cited by in corpus (41)

• Superconductivity and spin-orbit coupling in non-centrosymmetric materials: a review
• Protected boundary states in gapless topological phases
• Topologically protected surface states in a centrosymmetric superconductor beta-PdBi2
• Dirac Surface States and Nature of Superconductivity in Noncentrosymmetric BiPd
• A comprehensive review on topological superconducting materials and interfaces
• Observation of the spin-polarized surface state in a noncentrosymmetric superconductor BiPd
• Nodeless superconductivity in noncentrosymmetric PbTaSe${}_2$ single crystals
• NMR and NQR Studies on Non-centrosymmetric Superconductors Re7B3, LaBiPt, and BiPd
• Anisotropic superconductivity in the noncentrosymmetric BiPd
• Spin-triplet pairing state evidenced by half-quantum flux in a noncentrosymmetric superconductor
• Theory of quasiparticle scattering interference on the surface of topological superconductors
• Tunneling spectroscopy of topological superconductors
• Observation of Dirac surface states in the noncentrosymmetric superconductor BiPd
• The single- vs. two-gap scenario: the specific heat and the thermodynamic critical field of BeAu superconductor
• Stability of flat-band edge states in topological superconductors without inversion center
• Unusual Dirac fermions on the surface of noncentrosymmetric $\alpha$ - BiPd superconductor
• Interface currents in topological superconductor-ferromagnet heterostructures
• Upper critical field of the noncentrosymmetric superconductor BiPd
• Evolution of the topologically protected surface states in superconductor $\beta$-Bi${}_2$Pd from the three-dimensional to the two-dimensional limit
• Quantum oscillations and a non-trivial Berry phase in the noncentrosymmetric superconductor BiPd
• Electron-phonon interaction and point contact enhanced superconductivity in trigonal PtBi2
• Helical spin texture of surface states in topological superconductors
• Majorana vortex-bound states in three-dimensional nodal noncentrosymmetric superconductors
• Full superconducting gap and type-I to type-II superconductivity transition in single crystalline NbGe2
• Anomalies in the core level spectroscopy of a noncentrosymmetric solid, BiPd
• Non-ballistic transport characteristics of superconducting point-contacts
• Transport and noise properties of a normal metal-superconductor-normal metal junction with mixed singlet and chiral triplet pairings
• $R$RuB${}_2$ ($R$=Y, Lu), topological superconductor candidates with hourglass-type Dirac ring
• Correct Brillouin zone and electronic structure of BiPd
• Anisotropic superconductivity in La(O,F)BiSeS crystals revealed by field-angle dependent Andreev reflection spectroscopy
• Point contact spectroscopy in Fe-based superconductors: recent advancements and future challenges
• Exceptional Dirac states in a non-centrosymmetric superconductor, BiPd
• Spin selective coupling to Majorana zero modes in mixed singlet and triplet superconducting nanowire
• Fermi surface and band structure of BiPd from ARPES studies
• Complete zero-energy flat bands of surface states in fully gapped chiral noncentrosymmetric superconductors
• Probing the superconducting pairing of the La${}_4$Be${}_{33}$Pt${}_{16}$ alloy via muon-spin spectroscopy
• Discovery of the topological surface state in a noncentrosymmetric superconductor BiPd
• Temperature dependence of the lower critical field of the noncentrosymmetric superconductor $\alpha$-BiPd
• Weakly Anisotropic Noncentrosymmetric Superconductors with Radial Line Nodes and Thermodynamical Anomalies
• Two-gap superconductivity in the noncentrosymmetric La${}_3$Se${}_4$ compound
• Exploring unconventional superconductivity in PdTe via Point Contact Spectroscopy