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

Journal Article · · Applied Physics Letters
DOI:https://doi.org/10.1063/5.0037765· OSTI ID:1850814
 [1];  [2];  [3];  [4];  [5];  [6];  [4];  [7];  [2];  [8]
  1. Cornell Univ., Ithaca, NY (United States); Cornell Univ., Ithaca, NY (United States)
  2. Univ. of Illinois at Urbana-Champaign, IL (United States)
  3. Cornell Univ., Ithaca, NY (United States)
  4. Univ. of Florida, Gainesville, FL (United States)
  5. Univ. of Florida, Gainesville, FL (United States); Chinese Academy of Sciences (CAS), Beijing (China); University of Chinese Academy of Sciences, Beijing (China)
  6. Samsung Electronics (South Korea)
  7. Missouri Univ. of Science and Technology, Rolla, MO (United States)
  8. Cornell Univ., Ithaca, NY (United States); Kavli Institute at Cornell for Nanoscale Science, Ithaca, NY (United States); Leibniz Inst. for Crystal Growth (IKZ), Berlin (Germany)
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.
Research Organization:
Cornell Univ., Ithaca, NY (United States)
Sponsoring Organization:
National Science Foundation (NSF); US Army Research Office (ARO); USDOE; USDOE Office of Science (SC)
Grant/Contract Number:
SC0002334
OSTI ID:
1850814
Alternate ID(s):
OSTI ID: 1769220
Journal Information:
Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 9 Vol. 118; ISSN 0003-6951
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English

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