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Surface termination and electronic reconstruction in YBa2Cu3O7−δ

DOI: 10.1103/PhysRevB.98.081112 DOI Help

Authors: Hideaki Iwasawa (Diamond Light Source) , Niels B. M. Schroeter (University of Oxford) , Takahiko Masui (Kindai University) , Setsuko Tajima (Osaka University) , Timur K. Kim (Diamond Light Source) , Moritz Hoesch (Diamond Light Source; Deutsches Elektronen-Synchrotron (DESY))
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Physical Review B , VOL 98

State: Published (Approved)
Published: August 2018
Diamond Proposal Number(s): 16871 , 17192

Abstract: We present a spatially resolved angle-resolved photoemission spectroscopy (ARPES) study on the Y-based high-Tc cuprate superconductor YBa2Cu3O7−δ to disentangle surface electronic inhomogeneity. Two surface terminations consisting of either a CuO or BaO layer are identified through a chemical-states-specified core-level intensity distribution. This enables us to perform termination-selective ARPES measurements that uncover the different charge fillings and electronic configurations depending on the surface termination. By combining the real-space and electronic information, we propose a simple model to explain the termination-dependent surface electronic reconstruction. Our results demonstrate a significant importance of the spatially resolved ARPES in order to obtain intriguing electronic information, particularly from surface-inhomogeneous systems.

Journal Keywords: Electronic structure; Superconductivity; High-temperature superconductors; Angle-resolved photoemission spectroscopy

Subject Areas: Physics, Materials


Instruments: I05-ARPES