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Characterization of niobium films with varying RRR values at low temperatures.

POSTER

Abstract

Niobium films are used both in microscopic superconducting qubits for quantum computing and in macroscopic SRF cavities for particle accelerators. Superconducting properties of niobium in microwave fields vary significantly with lattice defects and impurity content, where sub-at.% impurity level can reduce or increase microwave surface resistance by an order of magnitude. We studied the microwave properties of niobium films, deposited by different physical vapor deposition techniques, at low microwave fields correlating microwave properties at dilution fridge temperatures with material properties characterized with surface science techniques.

Presenters

  • Bektur Abdisatarov

    Western Kentucky University, Old Dominion University

Authors

  • Grigory Eremeev

    Fermi National Accelerator Laboratory, Fermilab, Superconducting Quantum Materials and Systems Center (SQMS), Fermilab

  • Bektur Abdisatarov

    Western Kentucky University, Old Dominion University

  • Mustafa Bal

    National Institute of Standards and Technology Boulder, Fermilab, Superconducting Quantum Materials and Systems Center (SQMS), Fermilab

  • Hani E. E Elsayed-Ali

    Old Dominion University

  • Akshay A Murthy

    Fermilab, Superconducting Quantum Materials and Systems Center (SQMS), Fermilab

  • ZuHawn Sung

    Fermilab, Superconducting Quantum Materials and Systems Center (SQMS), Fermilab

  • Anne-Marie Valente-Feliciano

    Jefferson Lab

  • Anna Grassellino

    Fermilab, Superconducting Quantum Materials and Systems Center (SQMS), Fermilab

  • Alexander Romanenko

    Fermilab, Superconducting Quantum Materials and Systems Center (SQMS), Fermilab