Symmetry-mediated quantum coherence of W5+ spins in an oxygen-deficient double perovskite
Name
s41535-025-00782-3.pdf
Description
Published version
Size
1.34 MB
Format
Adobe PDF
Checksum (MD5)
7a04af0e280eb8cba4cb48005417a442
Author(s)
Bernier, Shannon
Sinha, Mekhola
Pearson, Tyler J
Sushko, Peter V
Oyala, Paul H
Siegler, Maxime A
Adam Phelan, W
Neill, Abby N
Freedman, Danna E
McQueen, Tyrel M
Date Issued
June 18, 2025
Journal
npj Quantum Materials
Publisher
Springer Science and Business Media LLC
Citation
Bernier, S., Sinha, M., Pearson, T.J. et al. Symmetry-mediated quantum coherence of W5+ spins in an oxygen-deficient double perovskite. npj Quantum Mater. 10, 62 (2025).
Version
Final published version
Abstract
Elucidating the factors limiting quantum coherence in real materials is essential to the development of quantum technologies. Here we report a strategic approach to determine the effect of lattice dynamics on spin coherence lifetimes using oxygen deficient double perovskites as host materials. In addition to obtaining millisecond T1 spin-lattice lifetimes at T ~ 10 K, measurable quantum superpositions were observed up to room temperature. We determine that T2 enhancement in Sr2CaWO6-δ over previously studied Ba2CaWO6-δ is caused by a dynamically-driven increase in effective site symmetry around the dominant paramagnetic site, assigned as W5+ via electron paramagnetic resonance spectroscopy. Further, a combination of experimental and computational techniques enabled quantification of the relative strength of spin-phonon coupling of each phonon mode. This analysis demonstrates the effect of thermodynamics and site symmetry on the spin lifetimes of W5+ paramagnetic defects, an important step in the process of reducing decoherence to produce longer-lived qubits.
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Creative Commons Attribution-NonCommercial-NoDerivatives
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DOI of Published Version
https://doi.org/10.1038/s41535-025-00782-3
