Author： Yao-Bo Huang Pierre Richard Ji-Hui Wang Xiao-Ping Wang Xun Shi Nan Xu Zheng Wu Ang Li Jia-Xin Yin Tian Qian Bing Lv Ching-Wu Chu Shu-Heng Pan Ming Shi Hong Ding
Publisher： IOP Publishing
ISSN： 0256-307X
Source： Chinese Physics Letters, Vol.30, Iss.1, 2013-01, pp. : 17402-17405
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Abstract
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 Γ-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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