Angle-resolved photoemission spectroscopy study of HgBa2CuO4+delta

Article

关键词: T-C;    SUPERCONDUCTING GAP;    PSEUDOGAP PHASE;    SURFACE;    ENERGY;    COMPETITION;    DISPERSION;    ARPES;   

DOI  :  10.1103/PhysRevB.89.195141

来源: SCIE

【 摘 要 】

HgBa2CuO4+delta (Hg1201) has been shown to be a model cuprate for scattering, optical, and transport experiments, but angle-resolved photoemission spectroscopy (ARPES) data are still lacking owing to the absence of a charge-neutral cleavage plane. We report on progress in achieving the experimental conditions for which quasiparticles can be observed in the near-nodal region of the Fermi surface. The d-wave superconducting gap in near-optimally-doped Hg1201 is found to have a maximum of 39 meV. At low temperature, a kink is detected in the nodal dispersion at approximately 51 meV below the Fermi level, an energy that is different from other cuprates with comparable T-c. The superconducting gap, Fermi surface, and nodal band renormalization measured here provide a crucial momentum-space complement to other experimental probes.

【 授权许可】

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