We present the results of resonant photoemission spectroscopy experiments on the Mo$_{ 1-x}$Re$_{ x}$ alloy compositions spanning over two electronic topological transitions (ETT) at the critical concentrations $x_{ C1}$ = 0.05 and $x_{ C2}$ = 0.11. The photoelectrons show an additional resonance ($R3$) in the constant initial state (CIS) spectra of the alloys along with two resonances ($R1$ and $R2$) which are similar to those observed in molybdenum. All the resonances show Fano-like line shapes. The asymmetry parameter $q$ of the resonances $R1$ and $R3$ of the alloys is observed to be large and negative. Our analysis suggests that the origin of large negative q is associated with phonon assisted inter band scattering between the Mo-like states and the narrow band that appeared due to the ETT.
Categories: cond-mat.supr-con cond-mat.mtrl-sci