Glass-Like Through-Plane Thermal Conductivity Induced by Oxygen Vacancies in Nanoscale Epitaxial La0.5Sr0.5CoO3–δ [Glass-Like Thermal Conductivity Induced by Oxygen Vacancies in Nanoscale Epitaxial La0.5Sr0.5CoO3–δ]

Wu, Xuewang; Walter, Jeff; Feng, Tianli; Zhu, Jie; Zheng, Hong; Mitchell, John F.; Biskup, Neven; Varela, Maria; Ruan, Xiulin; Leighton, Chris; Wang, Xiaojia

doi:10.1002/adfm.201704233

Glass-Like Through-Plane Thermal Conductivity Induced by Oxygen Vacancies in Nanoscale Epitaxial La_0.5Sr_0.5CoO_3–_δ [Glass-Like Thermal Conductivity Induced by Oxygen Vacancies in Nanoscale Epitaxial La_0.5Sr_0.5CoO_3–_δ]

Journal Article · Thu Nov 02 00:00:00 EDT 2017 · Advanced Functional Materials

DOI:https://doi.org/10.1002/adfm.201704233· OSTI ID:1415607

Wu, Xuewang ^[1]; Walter, Jeff ^[1]; Feng, Tianli ^[2]; Zhu, Jie ^[1]; Zheng, Hong ^[3]; Mitchell, John F. ^[3]; Biskup, Neven ^[4]; Varela, Maria ^[4]; Ruan, Xiulin ^[2]; Leighton, Chris ^[1]; Wang, Xiaojia ^[1]

Univ. of Minnesota, Minneapolis, MN (United States)
Purdue Univ., West Lafayette, IN (United States)
Argonne National Lab. (ANL), Argonne, IL (United States)
Univ. Complutense de Madrid, Madrid (Spain)

Here, ultrafast time-domain thermoreflectance (TDTR) is utilized to extract the through-plane thermal conductivity (Λ_LSCO) of epitaxial La_0.5Sr_0.5CoO_3–δ (LSCO) of varying thickness (<20 nm) on LaAlO₃ and SrTiO₃ substrates. These LSCO films possess ordered oxygen vacancies as the primary means of lattice mismatch accommodation with the substrate, which induces compressive/tensile strain and thus controls the orientation of the oxygen vacancy ordering (OVO). TDTR results demonstrate that the room-temperature Λ_LSCO of LSCO on both substrates (1.7 W m^–1 K^–1) are nearly a factor of four lower than that of bulk single-crystal LSCO (6.2 W m^–1 K^–1). Remarkably, this approaches the lower limit of amorphous oxides (e.g., 1.3 W m^–1 K^–1 for glass), with no dependence on the OVO orientation. Through theoretical simulations, origins of the glass-like thermal conductivity of LSCO are revealed as a combined effect resulting from oxygen vacancies (the dominant factor), Sr substitution, size effects, and the weak electron/phonon coupling within the LSCO film. The absence of OVO dependence in the measured Λ_LSCO is rationalized by two main effects: (1) the nearly isotropic phononic thermal conductivity resulting from the imperfect OVO planes when δ is small; (2) the missing electronic contribution to Λ_LSCO along the through-plane direction for these ultrathin LSCO films on insulating substrates.

View Accepted Manuscript (DOE)

Research Organization:: Argonne National Lab. (ANL), Argonne, IL (United States)

Sponsoring Organization:: National Natural Science Foundation of China; National Science Foundation (NSF); Spanish Ministerio de Economia y Competitividad (MINECO); USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division

Grant/Contract Number:: AC02-06CH11357; FG02-06ER46275; SC0016371

OSTI ID:: 1415607

Alternate ID(s):: OSTI ID: 1407813

Journal Information:: Advanced Functional Materials, Journal Name: Advanced Functional Materials Journal Issue: 47 Vol. 27; ISSN 1616-301X

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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Related Subjects

36 MATERIALS SCIENCE
Boltzmann transport equation
LSCO
TDTR
molecular dynamics simulation
nanoscale epitaxial LSCO
oxygen vacancies
perovskite
thermal conductivity
time-domain thermoreflectance