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.

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

References in corpus (15)

• Topological Phases of Noncentrosymmetric Superconductors: Edge States, Majorana Fermions, and the Non-Abelian Statistics
• Spin Triplet Superconducting State due to Broken Inversion Symmetry in Li_2Pt_3B
• 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
• Anomalous Andreev bound state in non-centrosymmetric superconductors
• Surface density of states and topological edge states in non-centrosymmetric superconductors
• 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

Cited by in corpus (8)

• Dirac Surface States and Nature of Superconductivity in Noncentrosymmetric BiPd
• The single- vs. two-gap scenario: the specific heat and the thermodynamic critical field of BeAu superconductor
• Observation of Dirac surface states in the noncentrosymmetric superconductor BiPd
• Unusual Dirac fermions on the surface of noncentrosymmetric $\alpha$ - BiPd superconductor
• Helical spin texture of surface states in topological superconductors
• Majorana vortex-bound states in three-dimensional nodal noncentrosymmetric superconductors
• Exceptional Dirac states in a non-centrosymmetric superconductor, BiPd
• Discovery of the topological surface state in a noncentrosymmetric superconductor BiPd