Possible origin of the reduced magnetic moment in iron pnictides: A dynamical mean field theory study - Condensed Matter > SuperconductivityReport as inadecuate




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Abstract: We investigate the phase diagram of a two-band frustrated Hubbard model inthe framework of dynamical mean field theory. While a first-order phasetransition occurs from a paramagnetic PM metal to an antiferromagnetic AFinsulator when both bands are equally frustrated, an intermediate AF metallicphase appears in each band at different $U c$ values if only one of the twobands is frustrated, resulting in continuous orbital-selective phasetransitions from PM metal to AF metal and AF metal to AF insulator. We arguethat such intermediate phases are possibly related to the puzzling AF metallicstate with small magnetization observed in undoped iron-pnictidesuperconductors as well as to the pseudogap features observed in opticalexperiments.



Author: Hunpyo Lee, Yu-Zhong Zhang, Harald O. Jeschke, Roser Valenti

Source: https://arxiv.org/







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