Thermal conductivity of the n = 1–5 and 10 members of the (SrTiO3)nSrO Ruddlesden–Popper superlattices
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.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Mar 01, 2021
- Source ID
- 10.1063/5.0037765
Entities
People
- Aleksandr Chernatynskiy
- Che-hui Lee
- Darrell G. Schlom
- David Cahill
- Ella K. Pek
- Eugene J. Ragasa
- Kiyoung Lee
- Natalie M. Dawley
- Simon R. Phillpot
- Xue Xiong
Organizations
- Cornell University
- Defense Advanced Research Projects Agency
- Institute of Engineering Thermophysics, Chinese Academy of Sciences
- Leibniz Institute for Crystal Growth
- Missouri University of Science and Technology
- National Science Foundation
- Samsung Electronics
- United States Department of Energy
- University of Chinese Academy of Sciences
- University of Florida
- University of Illinois Urbana–Champaign