期刊
CHINESE PHYSICS LETTERS
卷 30, 期 1, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0256-307X/30/1/017402
关键词
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资金
- Chinese Academy of Sciences [2010Y1JB6]
- National Basic Research Program of China [2010CB923000, 2011CBA001000]
- National Natural Science Foundation of China [11004232, 11050110422]
- Sino-Swiss Science and Technology Cooperation [IZLCZ2 138954]
- US Air Force Office of Scientific Research [FA9550-09-1-0656]
- Department of Energy [4000086706]
- AFRL [R15901]
We performed a combined angle-resolved photoemission spectroscopy and scanning tunneling microscopy study of the electronic structure of electron-doped Ca0.83La0.17Fe2As2. A surface reconstruction associated with the dimerization of As atoms is observed directly in the real space, as well as the consequent band folding in the momentum space. Besides this band folding effect, the Fermi surface topology of this material is similar to that reported previously for BaFe1.85Co0.15As2, with Gamma-centered hole pockets quasi-nested to M-centered electron pockets by the antiferromagnetic wave vector. Although no superconducting gap is observed by ARPES possibly due to low superconducting volume fraction, a gap-like density of states depression of 7.7 +/- 2.9 meV is determined by scanning tunneling microscopy.
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