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

Mintu Mondal; Bhanu Joshi; Sanjeev Kumar; Anand Kamlapure; Somesh Chandra Ganguli; Arumugam Thamizhavel; Sudhansu S. Mandal; Srinivasan Ramakrishnan; Pratap Raychaudhuri

doi:10.1103/PhysRevB.86.094520

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

Mintu Mondal, Bhanu Joshi, Sanjeev Kumar, Anand Kamlapure, Somesh Chandra Ganguli, Arumugam Thamizhavel, Sudhansu S. Mandal, Srinivasan Ramakrishnan, Pratap Raychaudhuri

DOI 10.1103/PhysRevB.86.094520 · Physical Review B

T1

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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.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
BiPd Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	3.62	Pressure not reported	onset
CePt3Si Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
Li2Pt3B Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown