Orbital-transverse density-wave instabilities in iron-based superconductors

Details Orbital-transverse density-wave instabilities in iron-based superconductors Orbital-transverse density-wave instabilities in iron-based superconductors

2010-03-08

arxiv.org/abs/1003.1660v2

EPL 93, 37009 (2011)

Physics

Condensed Matter

Strongly Correlated Electrons

several parts were rewritten for clarity. 6 pages, 3 figures, 1 table

Scientific paper

10.1209/0295-5075/93/37009

Besides the conventional spin-density-wave (SDW) state, a new kind of orbital-transverse density-wave (OTDW) state is shown to exist generally in multi-orbital systems. We demonstrate that the orbital character of Fermi surface nesting plays an important role in density responses. The relationship between antiferromagnetism and structural phase transition in LaFeAsO (1111) and BaFe$_2$As$_2$ (122) compounds of iron-based superconductors may be understood in terms of the interplay between the SDW and OTDW with a five-orbital Hamiltonian. We propose that the essential difference between 1111 and 122 compounds is crucially determined by the presence of the two-dimensional $d_{xy}$-like Fermi surface around (0,0) being only in 1111 parent compounds.

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