Fermi surfaces of iron-pnictide high-Tc superconductors from the limit of local magnetic moments

Details Fermi surfaces of iron-pnictide high-Tc superconductors from the limit of local magnetic moments Fermi surfaces of iron-pnictide high-Tc superconductors from the limit of local magnetic moments

2011-06-14

arxiv.org/abs/1106.2600v3

Phys. Rev. B 84, 224504 (2011)

Physics

Condensed Matter

Superconductivity

11 pages, 3 figures, published version

Scientific paper

10.1103/PhysRevB.84.224504

A 2-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 meanfield theory and by exact numerical diagonalization on a finite system. 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 when inter-orbital hole hopping is suppressed. Low-energy spinwaves 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.

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