Terahertz electrodynamics and kinetic inductance of disordered titanium–vanadium alloy thin films

Disordered superconductors represent an important area in modern condensed matter physics, where superconductivity survives even in the presence of strong electron scattering and localization effects. Understanding how disorder modifies the high-frequency electrodynamic response is not only important from a physics point of view but also essential for developing next-generation quantum detectors and superconducting devices. In this work, we investigate the terahertz electrodynamics of disordered Ti40V60 alloy thin films using terahertz time-domain spectroscopy to understand the relationship between disorder, quasiparticle dynamics, and kinetic inductance. By analyzing the complex conductivity, penetration depth, and superfluid response, we observe variations in the inductive response under different deposition conditions. Unlike conventional nitride superconductors that require tightly controlled reactive growth conditions, Ti40V60 alloys provide a simpler and more adaptable route for investigating the superconducting parameters under different deposition conditions. These findings demonstrate the THz electrodynamic response of the Ti40V60 alloy thin films and highlight their potential for kinetic inductance detector applications.