title: Observation of multiple superconducting gaps in Fe₁+yTe₁-xSex via a nanoscale approach to point-contact spectroscopy.
abstract: We report a novel  experimental approach to point-contact Andreev reflection spectroscopy with diagnostic capability via a unique design for nanoscale normal metal/superconductor devices with excellent thermomechanical stability, and have employed this method to unveil the existence of two superconducting energy gaps in iron chalcogenide Fe(1+y)Te(1-x)Se(x), which is crucial for understanding its pairing mechanism. This work opens up new opportunities to study gap structures in superconductors and elemental excitations in solids.
authors.affiliation: Department of Physics and the Texas Center for Superconductivity, University of Houston, 4800 Calhoun Road, Houston, TX 77204-5005, USA. haibingpeng@uh.edu
authors.forename: Haibing
authors.initials: H
authors.lastname: Peng
authors.forename: Debtanu
authors.initials: D
authors.lastname: De
authors.forename: Zheng
authors.initials: Z
authors.lastname: Wu
authors.forename: Carlos
authors.initials: C
authors.lastname: Diaz-Pinto