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

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

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

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arxiv 1202.2454 v2 pith:YOBMPSKT submitted 2012-02-11 cond-mat.supr-con cond-mat.str-el

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

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Pratap Raychaudhuri

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classification cond-mat.supr-concond-mat.str-el

keywords andreevbipdenergygapsmultiplenon-centrosymmetricpcarpoint

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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.

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