Ultrahigh-inductance materials from spinodal decomposition

Abstract

Disordered superconducting nitrides with kinetic inductance have long been considered a leading material candidate for high-inductance quantum-circuit applications. Despite continuing efforts in reducing material dimensions to increase the kinetic inductance and the corresponding circuit impedance, it becomes a fundamental challenge to improve further without compromising material qualities. To this end, we propose a method to drastically increase the kinetic inductance of superconducting materials via spinodal decomposition while keeping a low microwave loss. We use epitaxial Ti\textsubscript{0.48}Al\textsubscript{0.52}N as a model system, and for the first time demonstrate the utilization of spinodal decomposition to trigger the insulator-to-superconductor transition with a drastically enhanced material disorder. The measured kinetic inductance has increased by 2-3 orders of magnitude compared with all the best reported disordered superconducting nitrides. Our work paves the way for substantially enhancing and deterministically controlling the inductance for advanced superconducting quantum circuits.

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Cited by in corpus (5)

• Fano Interference in Microwave Resonator Measurements
• The Rise of Refractory Transition-Metal Nitride Films for Advanced Electronics and Plasmonics
• High resistance of superconducting TiN thin films against environmental attacks
• The effects of disorder in superconducting materials on qubit coherence
• High Impedance Granular Aluminum Ring Resonators