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Cross-plane electronic and thermal transport properties of p-type La0.67Sr0.33MnO3/LaMnO3 perovskite oxide metal/semiconductor superlattices
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10.1063/1.4754514
/content/aip/journal/jap/112/6/10.1063/1.4754514
http://aip.metastore.ingenta.com/content/aip/journal/jap/112/6/10.1063/1.4754514
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Schematic of metallic LSMO (8 nm)/semiconducting LMO (8 nm) superlattice (LSMO/LMO)60 structure.

Image of FIG. 2.
FIG. 2.

(a) XRD 2-theta-omega scan of an LSMO/LMO superlattice on a STO (100) substrate confirming c-axis epitaxial behavior with LSMO FWHM (0.027°) and LMO FWHM (0.102°) and (b) 110 RSM of a micron-thick LSMO/LMO superlattice. The LSMO and LMO peaks have a small degree of spread and show a consistent in-plane lattice parameter, confirming the pseudomorphic epitaxial growth of the superlattice film.

Image of FIG. 3.
FIG. 3.

(a) Low-magnification cross-sectional bright field TEM images of an LSMO (8 nm)/LMO (8 nm) superlattice and (b) high-resolution cross-section TEM confirming epitaxial layer contrast of LSMO/LMO superlattices on aSTO (100) substrate were taken using FEI Titan operating at 300 kV. The contrast in (a) along the normal to the growth surface is due to threading dislocations.

Image of FIG. 4.
FIG. 4.

(a) Top view SEM images of anisotropically etched LSMO/LMO superlattices with pillar heights of 1 μm and the schematic of final structure of LSMO/LMO superlattices for I-V cross-plane measurement. (b) Side view of final structure and (c) top view of final structure.

Image of FIG. 5.
FIG. 5.

(a) Temperature-dependent in-plane resistivity of LSMO and (b) temperature-dependent in-plane resistivity of LMO with and without a magnetic field applied in a direction normal to the film surface.

Image of FIG. 6.
FIG. 6.

(a) In-plane Seebeck measurement of LSMO shows Seebeck coefficient consistent with metallic behavior with a magnitude of less than 20 μV/K and (b) in-plane Seebeck measurement of LMO validating p-type behavior with a room temperature Seebeck coefficient of 140 ± 3 μV/K.

Image of FIG. 7.
FIG. 7.

Photo-acoustic (PA) experimental amplitude measurement as a function of the modulation frequency for (a) LSMO sample, (b) LMO sample, and (c) LSMO/LMO superlattice.

Image of FIG. 8.
FIG. 8.

(a) Measured in-plane resistivity and (b) extracted cross-plane resistivity of p-type LSMO/LMO superlattice using temperature dependent I-V measurement. The magnetic transition peak is shifted to T ∼ 330 K in cross-plane transport through LSMO/LMO superlattices, ∼80 K higher than the peak observed in in-plane resistivity in LSMO, LMO, or LSMO/LMO thin films.

Image of FIG. 9.
FIG. 9.

The in-plane LSMO/LMO superlattices electrical conductivity fitting plot to extract the effective thermal activation energy of 101 ± 5 meV.

Image of FIG. 10.
FIG. 10.

Arrhenius plot of cross-plane LSMO/LMO superlattice electrical conductivity. The fitting extracted an effective barrier height of 300 ± 15 meV.

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/content/aip/journal/jap/112/6/10.1063/1.4754514
2012-09-26
2014-04-17
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Cross-plane electronic and thermal transport properties of p-type La0.67Sr0.33MnO3/LaMnO3 perovskite oxide metal/semiconductor superlattices
http://aip.metastore.ingenta.com/content/aip/journal/jap/112/6/10.1063/1.4754514
10.1063/1.4754514
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