期刊
PHYSICAL REVIEW B
卷 89, 期 19, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.89.195141
关键词
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资金
- DOE Office of Science, Division of Materials Science [DE-FG03-01ER45929-A001, DE-AC02-76SF00515]
- Department of Energy, Office of Basic Energy Sciences [DE-SC0006858]
- Marie Curie Fellowship
- European Research Council (Advanced Grant Quantum Puzzle) [227378]
- U.S. Department of Energy (DOE) [DE-SC0006858] Funding Source: U.S. Department of Energy (DOE)
- European Research Council (ERC) [227378] Funding Source: European Research Council (ERC)
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.
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