TY - JOUR
KW - Models
KW - Thermal conductivity
KW - Scattering
KW - Oxide
KW - Perovskite
KW - Oxides
KW - Chemistry
KW - Radiation
KW - Crystallization
KW - Density functional theory
KW - Epitaxial growth
KW - Computer simulation
KW - Radiation scattering
KW - Phonons
KW - Materials testing
KW - Article
KW - Titanium
KW - Oxide superlattices
KW - Calcium compounds
KW - Calcium derivative
KW - Collective excitations
KW - Interface density
KW - Interference effects
KW - Lattice thermal conductivity
KW - Macroscopic properties
KW - Perovskite oxides
KW - Thermoelectrics
KW - Phonon scattering
KW - Chemical model
KW - Chemical
AU - J Ravichandran
AU - A.K Yadav
AU - R Cheaito
AU - P.B Rossen
AU - A Soukiassian
AU - S.J Suresha
AU - J.C Duda
AU - B.M Foley
AU - C.-H Lee
AU - Y Zhu
AU - A.W Lichtenberger
AU - J.E Moore
AU - D.A Muller
AU - D.G Schlom
AU - P.E Hopkins
AU - A Majumdar
AU - Ramamoorthy Ramesh
AU - M.A Zurbuchen
AB - 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. © 2014 Macmillan Publishers Limited. All rights reserved.
BT - Nature Materials
DO - 10.1038/nmat3826
LA - eng
M1 - 2
N1 - cited By 226
N2 - 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. © 2014 Macmillan Publishers Limited. All rights reserved.
PY - 2014
SP - 168
EP - 172
T2 - Nature Materials
TI - Crossover from incoherent to coherent phonon scattering in epitaxial oxide superlattices
VL - 13
SN - 14761122
ER -