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Introduction of spin centers in single crystals of Ba<sub>2</sub>CaWO<sub>6-δ</sub>

ORAL

Abstract

Electronic spins are ideal qubit candidates both for their modularity and their ease of manipulation with microwave radiation. While fundamentally, T2, the spin-spin relaxation time, represents the functional operating time of a qubit, T1, the spin-lattice relaxation time, is ultimately the most restrictive parameter, as T1 represents the theoretical upper limit to T2. Design approaches to maximize T1 remain an open question. We report the coherence properties of W5+ spin centers in Ba2CaWO6-δ generated by oxygen vacancies. We characterized these defects by measuring the T1 and T2 times from T = 5 to 150 K. Correlation of the T1 lifetimes obtained from pulse EPR with phonon modes obtained from the heat capacity data quantifies the contribution of respective phonon modes to the spin-phonon coupling in the system. These results demonstrate that systematic defect generation in double perovskite structures can generate viable paramagnetic point centers for quantum applications.

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Presenters

  • Mekhola Sinha

    Johns Hopkins University

Authors

  • Mekhola Sinha

    Johns Hopkins University

  • Tyler J. Pearson

    Chemistry, Northwestern University

  • Allen Scheie

    Oak Ridge National Lab, Johns Hopkins University, Oak Ridge National Laboratory, Institute for Quantum Matter, Johns Hopkins University

  • Timothy Reeder

    Johns Hopkins University, Colorado State University

  • Hector K. Vivanco

    Johns Hopkins University

  • Danna Freedman

    Northwestern University, Chemistry, Northwestern University

  • William Adam Phelan

    Department of Chemistry, Johns Hopkins University, Johns Hopkins University

  • Tyrel McQueen

    Johns Hopkins University, Chemistry, Johns Hopkins Univ, Institute for Quantum Matter and Department of Physics and Astronomy, Johns Hopkins University