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Defect accommodation in off-stoichiometric (SrTiO 3 ) n SrO Ruddlesden–Popper superlattices studied with positron annihilation spectroscopy

https://doi.org/10.1063/5.0011136

Dawley, Natalie M. ; Goodge, Berit H. ; Egger, Werner ; Barone, Matthew R. ; Kourkoutis, Lena F. ; Keeble, David J. ; Schlom, Darrell G. ( August 2020 , Applied Physics Letters)
null (Ed.)
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Improved control of atomic layering in perovskite-related homologous series

https://doi.org/10.1063/5.0036087

Barone, Matthew R. ; Dawley, Natalie M. ; Nair, Hari P. ; Goodge, Berit H. ; Holtz, Megan E. ; Soukiassian, Arsen ; Fleck, Erin E. ; Lee, Kiyoung ; Jia, Yunfa ; Heeg, Tassilo ; et al ( February 2021 , APL Materials)
null (Ed.)
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Atomic-Scale Mapping and Quantification of Local Ruddlesden–Popper Phase Variations

https://doi.org/10.1021/acs.nanolett.2c03893

Fleck, Erin E. ; Barone, Matthew R. ; Nair, Hari P. ; Schreiber, Nathaniel J. ; Dawley, Natalie M. ; Schlom, Darrell G. ; Goodge, Berit H. ; Kourkoutis, Lena F. ( December 2022 , Nano Letters)
Targeted chemical pressure yields tuneable millimetre-wave dielectric

https://doi.org/10.1038/s41563-019-0564-4

Dawley, Natalie M. ; Marksz, Eric J. ; Hagerstrom, Aaron M. ; Olsen, Gerhard H. ; Holtz, Megan E. ; Goian, Veronica ; Kadlec, Christelle ; Zhang, Jingshu ; Lu, Xifeng ; Drisko, Jasper A. ; et al ( February 2020 , Nature Materials)

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Sub‐Nanosecond Tuning of Microwave Resonators Fabricated on Ruddlesden–Popper Dielectric Thin Films

https://doi.org/10.1002/admt.201800090

Hagerstrom, Aaron M. ; Lu, Xifeng ; Dawley, Natalie M. ; Nair, Hari P. ; Mateu, Jordi ; Horansky, Robert D. ; Little, Charles A. E. ; Booth, James C. ; Long, Christian J. ; Schlom, Darrell G. ; et al ( July 2018 , Advanced Materials Technologies)

Abstract
Voltage‐tunable dielectric materials are widely used for microwave‐frequency signal processing. Among tunable dielectric thin films, (SrTiO₃)_nSrO Ruddlesden–Popper (RP) superlattices have exceptionally low loss at high frequencies. This paper reports the first realization of resonators, a ubiquitous building block of microwave components, fabricated on RP films, and an analysis of their static and dynamic tuning behavior. The RP film has a ferroelectric‐paraelectric phase transition at ≈200 K, and the tunability is strongest at this temperature. The resonators have approximately 2.5% tuning of the resonance frequency at room temperature and 20% tuning at 200 K, and a tuning time scale of less than a nanosecond, which is limited by the measurement circuit rather than material properties.

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