摘要
The electronic structure of the new superconductor SmO1-xFxFeAs （x = 0.15） is studied by angle-integrated photoemission spectroscopy. Our data show a sharp feature very close to the Fermi energy, and a relative fiat distribution of the density of states between 0.5eV and 3eV binding energy, which agrees well with the band structure calculations considering an antiferromagnetic ground state. No noticeable gap opening is observed at 12 K below the superconducting transition temperature, indicating the existence of large ungapped regions in the Brillouin zone.
The electronic structure of the new superconductor SmO1-xFxFeAs （x = 0.15） is studied by angle-integrated photoemission spectroscopy. Our data show a sharp feature very close to the Fermi energy, and a relative fiat distribution of the density of states between 0.5eV and 3eV binding energy, which agrees well with the band structure calculations considering an antiferromagnetic ground state. No noticeable gap opening is observed at 12 K below the superconducting transition temperature, indicating the existence of large ungapped regions in the Brillouin zone.
基金
Supported by the National Natural Science Foundation of China, the National Fundamental Research Program of China under Grant Nos 2006CB601002 2006CB921300 and 2006CB922005, and STCSM of China.
