Andreev bound state and multiple energy gaps in the noncentrosymmetric superconductor BiPd

2012/02/26 by Mintu Mondal, Bhanu Joshi, Sanjeev Kumar +9
Physics and Astronomy · #Andreev reflection #Band gap #Bound state #Condensed matter physics #Conductance #Energy (signal processing) #Materials science #Physics #Physics of Superconductivity and Magnetism #Quantum and electron transport phenomena #Quantum mechanics #Reflection (computer programming) #Spectral line #Superconductivity #Topological Materials and Phenomena #cond-mat.str-el #cond-mat.supr-con

paper · pdf · doi:10.1103/physrevb.86.094520

published as Physical Review B 86, 094520 (2012) · pdf file with figure (some corrections done, supplementary material added)

arxiv created 2012/02/26 · openalex publication_date 2012/09/18 · arxiv updated 2012/09/19 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05

Abstract

We report directional point contact Andreev reflection (PCAR) measurements on high-quality single crystals of the noncentrosymmetric 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 for the presence of an unconventional order parameter in this material.

Citations

• Theory of topological spin current in noncentrosymmetric superconductors
• Superconductivity without Inversion Symmetry: MnSi versusCePt3Si
• Measurement of magnetic penetration depth and superconducting energy gap in very thin epitaxial NbN films
• Andreev bound states and tunneling characteristics of a noncentrosymmetric superconductor
• Superconducting 2D System with Lifted Spin Degeneracy: Mixed Singlet-Triplet State
• Electron Correlation and Pairing States in Superconductors without Inversion Symmetry