Role of antiferromagnetic ordering in the (1 × 2) surface reconstruction of Ca(Fe1-xCox)2As2

Guorong Li, Liangbo Liang, Qing Li, Minghu Pan, V. B. Nascimento, Xiaobo He, A. B. Karki, Vincent Meunier, Rongying Jin, Jiandi Zhang, E. W. Plummer

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Low energy electron diffraction, scanning tunneling microscopy and spectroscopy, and first-principles spin-dependent density functional theory are utilized to investigate the geometric, electronic, and magnetic structures of the stripe-ordered (1×2) surface of Ca(Fe1-xCox)2As2 (x=0, 0.075). The surface is terminated with a 50% Ca layer. Compared to the bulk, the surface Ca layer has a large inward relaxation (∼0.5 Å), and the underneath As-Fe2-As layer displays a significant buckling. First-principles calculations show that the (1×2) phase is stabilized by the bulk antiferromagnetic spin ordering through the spin-charge-lattice coupling. Strikingly, a superconducting gap (∼7 meV at 7.4 K) is observed to spatially coexist with the (1×2) phase (x=0.075 compound). This implies the coexistence of both superconductivity and AFM ordering at the surface.

Original languageEnglish (US)
Article number077205
JournalPhysical review letters
Issue number7
StatePublished - Feb 20 2014

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy


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