Experimental investigation of the electronic structure of Ca 0.83La0.17Fe2As2

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

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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 BaFe 1.85Co0.15As2, 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.

Original languageEnglish
Article number017402
JournalChinese Physics Letters
Volume30
Issue number1
DOIs
Publication statusPublished - 2013 Jan

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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