Abstract
High-resolution scanning tunneling microscopy measurements on the (001) surface of BaFe 2As 2, a parent compound of Fe-based high-T c superconductors, reveal a complex surface with coexisting structural phases. Large areas display a squarelike (√2×√2)R45 structure with surface-pinned antiphase domains. The domain walls exhibit C 2 symmetry, in contrast with the bulk C 2v geometric structure. We argue that the strong spin-lattice coupling at the surface results in the coexistence of structure and spin antiphase domain boundaries with C 2 symmetry.
Original language | English |
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Article number | 060512 |
Journal | Physical Review B - Condensed Matter and Materials Physics |
Volume | 86 |
Issue number | 6 |
DOIs | |
State | Published - Aug 28 2012 |