%0 Generic %1 dag08 %A Daghofer, Maria %A Moreo, Adriana %A Riera, Jos&\#xe9; A. %A Arrigoni, Enrico %A Dagotto, Elbio %D 2008 %K fe-high-tc, theory %T Modeling of LaO_1-xF_xFeAs from the strong coupling perspective: the magnetic order and pairing channels %U http://arxiv.org/abs/0805.0148 %X A two-orbital model for the LaO_1-xF_xFe As superconductors is investigated using computational techniques on two-dimensional square clusters. The hopping amplitudes are derived from orbital overlap integrals, and the spin frustrating effect of the plaquette-diagonal Fe-Fe hopping is remarked. A `striped' state is stable in a broad range of couplings in the undoped regime, in agreement with neutron scattering. Adding two electrons to the undoped ground state of a small cluster, pairing operators are constructed, similarly as in t-J investigations for the cuprates. Depending on parameters, two pairing operators were identified: they involve inter-xz-yz orbital combinations forming spin singlets and triplets, both transforming as an extended s-wave under rotations.

@misc{dag08, abstract = {A two-orbital model for the LaO_{1-x}F_xFe As superconductors is investigated using computational techniques on two-dimensional square clusters. The hopping amplitudes are derived from orbital overlap integrals, and the spin frustrating effect of the plaquette-diagonal Fe-Fe hopping is remarked. A `striped' state is stable in a broad range of couplings in the undoped regime, in agreement with neutron scattering. Adding two electrons to the undoped ground state of a small cluster, pairing operators are constructed, similarly as in t-J investigations for the cuprates. Depending on parameters, two pairing operators were identified: they involve inter-xz-yz orbital combinations forming spin singlets and triplets, both transforming as an extended s-wave under rotations.}, added-at = {2008-06-25T19:30:29.000+0200}, author = {Daghofer, Maria and Moreo, Adriana and Riera, Jos\&\#xe9; A. and Arrigoni, Enrico and Dagotto, Elbio}, biburl = {https://www.bibsonomy.org/bibtex/2c70eb3c17565b1e9cc30437712bca349/jgl}, citeulike-article-id = {2923821}, eprint = {0805.0148}, interhash = {75128e395db25933820a85e43b1ec239}, intrahash = {c70eb3c17565b1e9cc30437712bca349}, keywords = {fe-high-tc, theory}, month = May, posted-at = {2008-06-24 15:34:11}, priority = {2}, timestamp = {2008-06-25T19:30:30.000+0200}, title = {Modeling of LaO_{1-x}F_xFeAs from the strong coupling perspective: the magnetic order and pairing channels}, url = {http://arxiv.org/abs/0805.0148}, year = 2008 }