Temperature-dependent resistivity and Seebeck coefficient in epitaxial La0.5Sr0.5CoO3 thin film
Year: 2026
Type: article
Abstract: La0.5Sr0.5CoO3 (LSCO55) thin film with a thickness of 13 nm was epitaxially grown on LaAlO3 (001) substrate by pulsed laser deposition. Its structural properties as well as its temperature-dependent electronic transport properties were investigated. X-ray diffraction confirmed single-phase “cube-on-cube” epitaxy with coherent in-plane strain. The film exhibits a low resistivity of ∼270 μΩ cm at 300 K and a quadratic temperature dependence below ∼200 K, indicating metallic behavior. The Seebeck coefficient shows two sign crossovers at ∼24 and ∼175 K with T3 dependence at low temperature. These findings demonstrate robust metallic transport in LSCO55 thin film and show that the thermoelectric response is not single-carrier-like: two Seebeck sign changes and a low-temperature dependence in T3 indicate competing carrier terms and a possible phonon drag contribution, shaped by magnetic ordering/disorder.
Source: Applied Physics Letters
DOI: 10.1063/5.0325942
Institutions: Lyon 1 Université, École Centrale de Lyon, Centre National de la Recherche Scientifique, Institut des Nanotechnologies de Lyon, Institut National des Sciences Appliquées de Lyon, Institut Lumière Matière, Laboratoire de physique de la matière condensée, Université de Picardie Jules Verne
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W7143702065