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![]() 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 | |
Pag. 0-0 | |
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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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