Ferroelectric-driven disorder inducing transition of bosonic insulator-superconductor in TiN/Hf_0.5Zr_0.5O₂ heterojunction

Unique quantum states induced by disorders can be characterized by quantum phase transitions in many-body systems. In this study, we experimentally observed a sharp resistance peak near the superconducting transition in superconductor/ferroelectric TiN/Hf(0.5)Zr(0.5)O(2 )heterostructures. The peak is attributed to the disorder introduced by ferroelectric fluctuations within the empirical model of metal-boson insulator-superconductor transitions. By modulating the quantum phase transitions in superconductivity and competing with the disorder through ferroelectric polarization, we provide a versatile platform for investigating the influence of ferroelectric materials on superconducting states.