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Phase diagram of doped BaFe$_2$As$_2$ superconductor under broken $C_4$ symmetry | | Yuan-Yen Tai
; Jian-Xin Zhu
; Matthias J. Graf
; C. S. Ting
; | | Date: |
6 Mar 2013 | | Abstract: | We develop a minimal multiorbital tight-binding model with realistic hopping
parameters. The model breaks the symmetry of the tetragonal point group by
lowering it from $C_4$ to $D_{2d}$, which accurately describes the Fermi
surface evolution of the electron-doped BaFe$_{2-x}$Co$_x$As$_2$ and hole-doped
Ba$_{1-y}$K$_y$Fe$_2$As$_2$ compounds. An investigation of the phase diagram
with a mean-field $t$-$U$-$V$ Bogoliubov-de Gennes Hamiltonian results in
agreement with the experimentally observed electron- and hole-doped phase
diagram with only one set of $t$, $U$ and $V$ parameters. Additionally, the
self-consistently calculated superconducting order parameter exhibits
$s^pm$-wave pairing symmetry with a small d-wave pairing admixture in the
entire doping range, % The superconducting $s^pm + d$-wave order parameter
which is the subtle result of the weakly broken symmetry and competing
interactions in the multiorbital mean-field Hamiltonian. | | Source: | arXiv, 1303.1446 | | Services: | Forum | Review | PDF | Favorites | |
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