Targeted chemical pressure yields tuneable millimetre-wave dielectric

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.; Uecker, Reinhard; Ganschow, Steffen; Long, Christian J.; Booth, James C.; Kamba, Stanislav; Fennie, Craig J.; Muller, David A.; Orloff, Nathan D.; Schlom, Darrell G.

doi:10.1038/s41563-019-0564-4

Title: Targeted chemical pressure yields tuneable millimetre-wave dielectric

Journal Article · 23 December 2019 · Nature Materials

DOI: https://doi.org/10.1038/s41563-019-0564-4 · OSTI ID:1801569

Dawley, Natalie M. ^[1];

^[2]; Hagerstrom, Aaron M. ^[3]; Olsen, Gerhard H. ^[4]; Holtz, Megan E. ^[4];

^[5]; Kadlec, Christelle ^[5]; Zhang, Jingshu ^[4];

^[3];

^[3]; Uecker, Reinhard ^[6];

^[6]; Long, Christian J. ^[3]; Booth, James C. ^[3]; Kamba, Stanislav ^[5];

^[4];

^[4]; Orloff, Nathan D. ^[3];

^[4]

Cornell Univ., Ithaca, NY (United States); OSTI
Univ. of Maryland, College Park, MD (United States); National Inst. of Standards and Technology (NIST), Boulder, CO (United States)
National Inst. of Standards and Technology (NIST), Boulder, CO (United States)
Cornell Univ., Ithaca, NY (United States)
Institute of Physics (ASCR), Prague (Czech Republic)
Leibniz-Institut für Kristallzüchtung, Berlin (Germany)

Epitaxial strain can unlock enhanced properties in oxide materials, but restricts substrate choice and maximum film thickness, above which lattice relaxation and property degradation occur. Here we employ a chemical alternative to epitaxial strain by providing targeted chemical pressure, distinct from random doping, to induce a ferroelectric instability with the strategic introduction of barium into today’s best millimetre-wave tuneable dielectric, the epitaxially strained 50-nm-thick n = 6 (SrTiO₃)_nSrO Ruddlesden–Popper dielectric grown on (110) DyScO₃. The defect mitigating nature of (SrTiO₃)_nSrO results in unprecedented low loss at frequencies up to 125 GHz. No barium-containing Ruddlesden–Popper titanates are known, but the resulting atomically engineered superlattice material, (SrTiO₃)_n-m(BaTiO₃)_mSrO, enables low-loss, tuneable dielectric properties to be achieved with lower epitaxial strain and a 200% improvement in the figure of merit at commercially relevant millimetre-wave frequencies. As tuneable dielectrics are key constituents of emerging millimetre-wave high-frequency devices in telecommunications, our findings could lead to higher performance adaptive and reconfigurable electronics at these frequencies.

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Research Organization:: Cornell University, Ithaca, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: SC0002334

OSTI ID:: 1801569

Journal Information:: Nature Materials, Journal Name: Nature Materials Journal Issue: 2 Vol. 19; ISSN 1476-1122

Publisher:: Springer Nature - Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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