2023/12/07 by Ankita Singh, Sawani Datta, Singh, Ankita +7
Materials Science · Physics and Astronomy · #FOS: Physical sciences #Magnetic and transport properties of perovskites and related materials #Physics of Superconductivity and Magnetism #Superconductivity (cond-mat.supr-con)
paper · pdf · doi:10.48550/arxiv.2312.04207
openalex publication_date 2023/12/07 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We study the growth and electronic properties of a high temperature superconductor, YBa2Cu3O7 (YBCO) in proximity of a magnetic material, La0.67Sr0.33MnO3 (LSMO). High quality single crystalline films of YBCO and LSMO/YBCO were grown epitaxially on SrTiO3 (001) surface. Magnetization data of the LSMO/YBCO bilayer exhibit ferromagnetic ordering with Curie temperature smaller than that of pure LSMO. Measurements at different field directions reveal emergence of an anisotropy at low temperatures with in-plane easy axis; the observed anisotropy is stronger in the superconducting region. Magnetization data of YBCO exhibit onset of diamagnetism at 86 K for the out-of-plane magnetic measurements while the in-plane measurements show onset at a slightly higher temperature of 89 K with much smaller moment. Interestingly, the onset of diamagnetism in LSMO/YBCO film remains at 86 K despite the presence of ferromagnetic LSMO layer underneath. The analysis of Ba 4d and Y 3d core level spectra suggest that the surface and bulk electronic structure in these systems are different; the difference is reduced significantly in the LSMO/YBCO sample suggesting an enhancement of electron density near the surface arising from the charge transfer across the interface, which is consistent with the magnetization data.