Abstract
This report describes our recent progress in the surface/interface study of high-Tc superconductors, where MBE-grown Nd1.85Ce0.15CuO4(NCCO) surfaces and metal/NCCO interfaces have been investigated by photoemission spectroscopies. Experiments were performed focusing on the evolution of the surface or interface electronic structure with oxygen nonstoichiometry at the surface or interface region. The results indicate that the surface and interface electronic structures of NCCO are strongly influenced by the oxygen nonstoichiometry, which is easily caused by an inappropriate reduction process or a redox reaction at metal/NCCO interfaces due to inherently weak nature of Cu-O bonds. This problem may be universal in cuprates. The correct oxygen stoichiometry is the most crucial issue for cuprate superconductors in preparing the bulk-representative surface (interface), which is indispensable in obtaining reliable data using surface sensitive experiments and in fabricating tunnel junctions and superlattices with desirable characteristics.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
