Crossover from incoherent to coherent phonon scattering in epitaxial oxide superlattices

Jayakanth Ravichandran, Ajay K. Yadav, Ramez Cheaito, Pim B. Rossen, Arsen Soukiassian, S. J. Suresha, John C. Duda, Brian M. Foley, Che Hui Lee, Ye Zhu, Arthur W. Lichtenberger, Joel E. Moore, David A. Muller, Darrell G. Schlom, Patrick E. Hopkins, Arun Majumdar, Ramamoorthy Ramesh, Mark A. Zurbuchen

Research output: Journal article publicationJournal articleAcademic researchpeer-review

288 Citations (Scopus)

Abstract

Elementary particles such as electrons or photons are frequent subjects of wave-nature-driven investigations, unlike collective excitations such as phonons. The demonstration of wave-particle crossover, in terms of macroscopic properties, is crucial to the understanding and application of the wave behaviour of matter. We present an unambiguous demonstration of the theoretically predicted crossover from diffuse (particle-like) to specular (wave-like) phonon scattering in epitaxial oxide superlattices, manifested by a minimum in lattice thermal conductivity as a function of interface density. We do so by synthesizing superlattices of electrically insulating perovskite oxides and systematically varying the interface density, with unit-cell precision, using two different epitaxial-growth techniques. These observations open up opportunities for studies on the wave nature of phonons, particularly phonon interference effects, using oxide superlattices as model systems, with extensive applications in thermoelectrics and thermal management.
Original languageEnglish
Pages (from-to)168-172
Number of pages5
JournalNature Materials
Volume13
Issue number2
DOIs
Publication statusPublished - 1 Feb 2014
Externally publishedYes

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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