Rivadulla Fernández, José FranciscoBugallo Ferrón, DavidLangenberg Pérez, EricCarbo-Argibay, EnriqueVarela Domínguez, NoaOtero Fumega, AdolfoPardo Castro, VíctorLucas del Pozo, IreneMorellón Alquézar, Luis Alberto2022-08-052022-08-052021J. Phys. Chem. Lett. 2021, 12, 11878−11885. https://doi.org/10.1021/acs.jpclett.1c034181948-7185http://hdl.handle.net/10347/29025Accessing the regime of coherent phonon propagation in nanostructures opens enormous possibilities to control the thermal conductivity in energy harvesting devices, phononic circuits, etc. In this paper we show that coherent phonons contribute substantially to the thermal conductivity of LaCoO3/SrTiO3 oxide superlattices, up to room temperature. We show that their contribution can be tuned through small variations of the superlattice periodicity, without changing the total superlattice thickness. Using this strategy, we tuned the thermal conductivity by 20% at room temperature. We also discuss the role of interface mixing and epitaxial relaxation as an extrinsic, material dependent key parameter for understanding the thermal conductivity of oxide superlatticeseng© The Author(s) 2021. This article is licensed under a Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/)http://creativecommons.org/licenses/by/4.0/InterfacesLatticesPhononsThermal conductivityThicknessjournal article10.1021/acs.jpclett.1c03418open access