Ferroelectric Domain Walls in PbTiO3 Are Effective Regulators of Heat Flow at Room Temperature
Langenberg, Eric (Universidade de Santiago de Compostela. Departamento de Química Física)
Saha, Dipanjan (Carnegie Mellon University. Mechanical Engineering Department)
Holtz, Megan E. (Cornell University)
Wang, Jian-Jun (Pennsylvania State University. Department of Materials Science and Engineering)
Bugallo, David (Universidade de Santiago de Compostela. Departamento de Química Física)
Ferreiro Vila, Elias (Universidade de Santiago de Compostela. Departamento de Química Física)
Paik, Hanjong (Cornell University. Department of Materials Science and Engineering)
Hanke, Isabelle (Leibniz-Institut für Kristallzüchtung)
Ganschow, Steffen (Leibniz-Institut für Kristallzüchtung)
Muller, David A. (Cornell University)
Chen, Long-Qing (Pennsylvania State University. Department of Materials Science and Engineering)
Catalan, Gustau (Institut Català de Nanociència i Nanotecnologia)
Domingo Marimon, Neus (Institut Català de Nanociència i Nanotecnologia)
Malen, Jonathan (Carnegie Mellon University. Mechanical Engineering Department)
Schlom, Darrell G. (Kavli Institute at Cornell for Nanoscale Science)
Rivadulla, Francisco (Universidade de Santiago de Compostela. Departamento de Química Física)

Data:	2019
Resum:	Achieving efficient spatial modulation of phonon transmission is an essential step on the path to phononic circuits using "phonon currents". With their intrinsic and reconfigurable interfaces, domain walls (DWs), ferroelectrics are alluring candidates to be harnessed as dynamic heat modulators. This paper reports the thermal conductivity of single-crystal PbTiO thin films over a wide variety of epitaxial-strain-engineered ferroelectric domain configurations. The phonon transport is proved to be strongly affected by the density and type of DWs, achieving a 61% reduction of the roomerature thermal conductivity compared to the single-domain scenario. The thermal resistance across the ferroelectric DWs is obtained, revealing a very high value (≈5. 0 × 10 K m W), comparable to grain boundaries in oxides, explaining the strong modulation of the thermal conductivity in PbTiO. This low thermal conductance of the DWs is ascribed to the structural mismatch and polarization gradient found between the different types of domains in the PbTiO films, resulting in a structural inhomogeneity that extends several unit cells around the DWs. These findings demonstrate the potential of ferroelectric DWs as efficient regulators of heat flow in one single material, overcoming the complexity of multilayers systems and the uncontrolled distribution of grain boundaries, paving the way for applications in phononics.
Ajuts:	European Commission 734187 European Commission 708129 Ministerio de Economía y Competitividad MAT2016-80762-R Ministerio de Economía y Competitividad BES-2017-079688
Drets:	Tots els drets reservats.
Llengua:	Anglès
Document:	Article ; recerca ; Versió acceptada per publicar
Publicat a:	Nano letters, Vol. 19, Issue 11 (November 2019) , p. 7901-7907, ISSN 1530-6992

DOI: 10.1021/acs.nanolett.9b02991
PMID: 31596599

Postprint 19 p, 1.1 MB

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