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SM ISO690:2012 THIESSEN, P, RODDATIS, Vladimir, RIEGER, Felix, BELENCHUK, Alexandr, KEUNECKE, M., MOSHNYAGA, Vasily T., JOOSS, Ch H.. Effect of charge ordering on crossplane thermal conductivity in correlated perovskite oxide superlattices. In: Physical Review B, 2018, vol. 98, p. 0. ISSN 2469-9950. DOI: https://doi.org/10.1103/PhysRevB.98.195114 |
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Physical Review B | |
Volumul 98 / 2018 / ISSN 2469-9950 /ISSNe 2469-9969 | |
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DOI:https://doi.org/10.1103/PhysRevB.98.195114 | |
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Lattice thermal conductivity is a sensitive probe of distortions of the translational invariance of crystalline materials. Crossplane thermal conductivity, κ(T), was studied by the 3ω technique in superlattices, comprising orthorhombic charge/orbital ordered manganite Pr0.7Ca0.3MnO3 and cubic SrTiO3. The manganite/titanite superlattices show a peak in κ(T) just above the charge order transition temperature TCO∼240K with a pronounced thermal hysteresis. This ordering peak in κ(T) is successively suppressed with decreasing layer thickness. Our results demonstrate a minor effect of the interface density on κ, primarily visible below TCO. In contrast, much higher changes in κ(T) evolve close to TCO, due to interface-induced effects on charge and orbital ordering. Our results suggest that the ordering peak in κ(T) is a result of lattice softening above the phase transition which is modified by thickness-dependent misfit strain. |
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Cuvinte-cheie perovskite, Magnetoresistance, Galvanomagnetic Effects |
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