Localization of electronic states resulting from electronic topological transitions in the Mo1−xRex alloys: A photoemission study

Abstract

We present the results of resonant photoemission spectroscopy experiments on Mo1−xRex alloy compositions spanning over two electronic topological transitions (ETTs) at critical concentrations xC1=0.05 and xC2=0.11. Photoelectrons show an additional resonance (R3) in constant initial state spectra of alloys along with two resonances (R1 and R2), which are similar to those observed in molybdenum. All the resonances show Fano-like line shapes. Asymmetry parameter q of resonances R1 and R3 of alloys is observed to be large and negative. Our analysis suggests that the origin of large negative q is associated with phonon assisted interband scattering between Mo-like states and the narrow band that appeared due to ETT.