Thermal conductivity of the n = 1-5 and 10 members of the (SrTiO3)n SrO Ruddlesden-Popper superlattices

Natalie M. Dawley, Ella K. Pek, Che Hui Lee, Eugene J. Ragasa, Xue Xiong, Kiyoung Lee, Simon R. Phillpot, Aleksandr V. Chernatynskiy, David G. Cahill, Darrell G. Schlom

Research output: Contribution to journalArticlepeer-review

Abstract

Unlike many superlattice structures, Ruddlesden-Popper phases have atomically abrupt interfaces useful for interrogating how periodic atomic layers affect thermal properties. Here, we measure the thermal conductivity in thin films of the n = 1-5 and 10 members of the (SrTiO3)nSrO Ruddlesden-Popper superlattices grown by molecular-beam epitaxy and compare the results to a single crystal of the n = 1 Ruddlesden-Popper SrLaAlO4. The thermal conductivity cross-plane to the superlattice layering (k33) is measured using time-domain thermoreflectance as a function of temperature and the results are compared to first-principles calculations. The thermal conductivity of this homologous series decreases with increasing interface density. Characterization by x-ray diffraction and scanning transmission electron microscopy confirms that these samples have a Ruddlesden-Popper superlattice structure.

Original languageEnglish (US)
Article number091904
JournalApplied Physics Letters
Volume118
Issue number9
DOIs
StatePublished - Mar 1 2021

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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