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Surface termination and electronic reconstruction in YBa2Cu3O7-δ
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DOI：10.1103/PhysRevB.98.081112.png)
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Abstract
En 中文
We present a spatially resolved angle-resolved photoemission spectroscopy (ARPES) study on the Y-based high-T-c cuprate superconductor YBa2Cu3O7-delta 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.
Keywords:
X-RAY
PHOTOEMISSION
GAP
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