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Meeting 2025 TMS Annual Meeting & Exhibition
Symposium Hume-Rothery Symposium on Thermodynamics of Microstructure Stability and Evolution
Presentation Title Hydride Formation in Superconducting Q-Bits
Author(s) Tyler Leibengood, Pierre-Clement A. Simon, Peter W. Voorhees
On-Site Speaker (Planned) Peter W. Voorhees
Abstract Scope The fabrication process for superconducting qubits that are based on 2D transmons frequently involves the deposition of niobium thin films on silicon substrates. The properties of superconducting qubits using Nb can also be affected by the formation of Nb hydrides. These phases have a significant lattice parameter mismatch with Nb implying that stress plays an important role on hydride formation. Unlike most hydride precipitation processes, Nb hydrides in transmons form in a 30-nanometer thick film of Nb. As a result, the effect of the free surface on the precipitation process can be profound. We find that due to the large diffusion coefficient of H in Nb, the Nb hydrides can precipitate in the film and then migrate quickly to the surface. A discussion of the critical role of stress and free surfaces on Nb-hydride formation and phase equilibrium in Nb-H thin films will be given.
Proceedings Inclusion? Planned:

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