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Title: Fermi surfaces of iron-pnictide high-Tc superconductors from the limit of local magnetic moment
Authors: Rodriguez, Rodriguez JP
Araújo, Araújo MAN
Sacramento, Sacramento PD
Keywords: superconductivity
Issue Date: 15-Dec-2011
Publisher: Physical Review B
Citation: Physical Review B 84, 224504 (2011)
Abstract: A two-orbital t-J model over the square lattice that describes low-energy electronic excitations in iron-pnictide high-Tc superconductors is analyzed with Schwinger-boson-slave-fermion mean-field theory and by exact numerical diagonalization on a finite system. When interorbital hole hopping is suppressed, a quantum critical point (QCP) is identified that separates a commensurate spin-density wave (cSDW) state at strong Hund's rule coupling from a hidden half metal state at weak Hund's rule coupling. Low-energy spin waves that disperse anisotropically from cSDW momenta are predicted at the QCP. Nested Fermi surfaces similar to those observed experimentally in iron-pnictide materials are also predicted in such case.
Type: article
Appears in Collections:FIS - Publicações - Artigos em Revistas Nacionais Com Arbitragem Científica

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