Electric transport and magnetic properties of LaBaCo2O6−δ single-crystal films grown on SrTiO3 substrates

• Published in: Physica. B, Condensed matter Condensed matter, 2021-08, Vol.614, p.413042, Article 413042
• Main Authors: Xiao, J.Y., Zhang, Q.Y., Meng, Y.S., Zhou, N., Liu, T., Ma, C.Y., Jiang, X.N.
• Format: Article
• Language: English
• Subjects: Annealing; Crystal growth; Electric transport; Ferromagnetic materials; LBCO; Magnetic moments; Magnetic properties; Magnetism; Phase separation; Single crystals; Single-crystal film; Spin glasses; Strontium titanates; Studies; Substrates
• ISSN: 0921-4526; 1873-2135
• DOI: 10.1016/j.physb.2021.413042

Deposition atmosphere was found to have significant impacts on the growth of single-crystal LaBaCo2O6−δ (LBCO) films. In 2 × 10−4 Pa, the LBCO film grew basically along the c-axis of LaBaCo2O5.5 and high-quality single-crystal LBCO film was obtained after O2 annealing. In 2 Pa of O2, the dominant domains in the LBCO film became a- and/or b-axis oriented and a phase separation appeared in the O-annealed film. The O-annealed LBCO films exhibited an obvious paramagnetic to ferromagnetic transition at ~200 K and ~1.3 μB/Co of saturated magnetic moment was obtained at 10 K. Ferromagnetic and spin-glass-like states may coexist in the LBCO films, making a deviation of the zero-field-cooled from the field-cooled magnetization at temperatures below an irreversible temperature. The LBCO films exhibited the magnetic properties close to that of nanoscale-ordered LaBaCo2O6, but the electric transport behaviors are close to that of ordered LaBaCo2O6. •Deposition atmosphere having significant impacts on the growth of LBCO films.•LBCO films being close to the nanoscale-ordered LaBaCo2O6 in the magnetism.•LBCO films being close to the ordered LaBaCo2O6 in the electric transport.•FM and SG coexistence making a deviation of ZFC from FC magnetization.•Strong electron correlations being responsible for the magnetoelectronic separation.