Аннотация

We have studied low-energy electronic structure of YBa2Cu3O7-delta using high-resolution angle-resolved photoemission spectroscopy (ARPES). By carefully tuning photon energy and polarization of incident light, we identified five different bands in the vicinity of the Fermi level, those are surface-bilayer-derived bonding and antibonding bands, their bulk counterparts, and CuO-chain-derived band, respectively. The surface bands show metallic property reflecting highly overdoped character, while bulk bands show signature of a dx2-y2-wave superconducting gap opening. The present ARPES result suggests the universality of the bulk electronic states in bilayer high-Tc superconductors.

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