Anomalous Nernst effect in the ceramic and thin film samples of La.sub.0.7./sub.Sr.sub.0.3./sub.CoO.sub.3./sub. perovskite

0541643 - FZÚ 2022 RIV US eng J - Journal Article
Soroka, Miroslav - Knížek, Karel - Jirák, Zdeněk - Levinský, Petr - Jarošová, Markéta - Buršík, J. - Hejtmánek, Jiří
Anomalous Nernst effect in the ceramic and thin film samples of La_0.7Sr_0.3CoO₃ perovskite.
Physical Review Materials. Roč. 5, č. 3 (2021), č. článku 035401. ISSN 2475-9953. E-ISSN 2475-9953
R&D Projects: GA MŠMT(CZ) EF16_019/0000760; GA ČR GA18-12761S; GA ČR(CZ) GA19-06433S; GA MŠMT(CZ) LM2018096
Grant - others:OP VVV - SOLID21(XE) CZ.02.1.01/0.0/0.0/16_019/0000760
Institutional support: RVO:68378271
Keywords : Nernst effect * thermal properties * thermoelectric effects * thermopower
OECD category: Condensed matter physics (including formerly solid state physics, supercond.)
Impact factor: 3.980, year: 2021
Method of publishing: Limited access
https://doi.org/10.1103/PhysRevMaterials.5.035401

We report the anomalous Nernst effect (ANE) in large-grain ceramics, nanogranular ceramics, and nanogranular thin films of La0.7Sr0.3CoO3, measured over the temperature range 5–300 K. The study is complemented with thermopower, resistivity, and magnetic measurements. The temperature-dependent ANE below the Curie temperature TC (240–250 K) is analyzed with the help of longitudinal resistivity and Seebeck using a previously proposed formula derived by a combination of Onsager reciprocity, the Mott formula, and the relation between transverse and longitudinal resistivity, ρxy∝ρnxx. We observe a characteristic exponent n ∼ 0.4 in agreement with the universal scaling for the bad-metal-type conduction regime. The nanogranular samples are characterized by higher resistivity, lower saturated magnetization, and a higher coercive field compared to large-grain ceramics.

Permanent Link: http://hdl.handle.net/11104/0319174