Multi-orbital quantum antiferromagnetism in iron pnictides-effective spin couplings and quantum corrections to sublattice magnetization.

@article{Ghosh2016MultiorbitalQA,
  title={Multi-orbital quantum antiferromagnetism in iron pnictides-effective spin couplings and quantum corrections to sublattice magnetization.},
  author={Sayandip Ghosh and Nimisha Raghuvanshi and Shubhajyoti Mohapatra and Ashish Kumar and Avinash Singh},
  journal={Journal of physics. Condensed matter : an Institute of Physics journal},
  year={2016},
  volume={28 36},
  pages={
          366002
        }
}
Effective spin couplings and spin fluctuation induced quantum corrections to sublattice magnetization are obtained in the [Formula: see text] AF state of a realistic three-orbital interacting electron model involving xz, yz and xy Fe 3d orbitals, providing insight into the multi-orbital quantum antiferromagnetism in iron pnictides. The xy orbital is found to be mainly responsible for the generation of strong ferromagnetic spin coupling in the b direction, which is critically important to fully… 
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References

SHOWING 1-10 OF 39 REFERENCES
Multiorbital spin susceptibility in a magnetically ordered state: Orbital versus excitonic spin density wave scenario
We present a general theory of multiorbital spin waves in magnetically ordered metallic systems. Motivated by the itinerant magnetism of iron-based superconductors, we compare the magnetic
Spin and charge dynamics ruled by antiferromagnetic order in iron pnictide superconductors
We examine the spin and charge excitations in antiferromagnetic iron pnictides by mean-field calculations with a random phase approximation in a five-band itinerant model. The calculated excitation
Low energy spin waves and magnetic interactions in SrFe2As2.
TLDR
The antiferromagnetic order in SrFe2As2 is consistent with a first order phase transition, similar to the structural lattice distortion, and the effective magnetic exchange coupling is estimated using a Heisenberg model.
On evaluation of transverse spin fluctuations in quantum magnets
A numerical method is described for evaluating transverse spin correlations in the random phase approximation. Quantum spin-fluctuation corrections to sublattice magnetization are evaluated for the
Spin fluctuations and superconductivity in a 3D tight-binding model for BaFe2As2
Despite the wealth of experimental data on the Fe-pnictide compounds of the KFe2As2 type, K=Ba, Ca, or Sr, the main theoretical work based on multiorbital tight-binding models has been restricted so
Fermionic representation for the ferromagnetic Kondo lattice model: Diagrammatic study of spin-charge coupling effects on magnon excitations
A purely fermionic representation is introduced for the ferromagnetic Kondo lattice model which allows conventional diagrammatic tools to be employed to study correlation effects. Quantum 1/S
Symmetry-breaking orbital anisotropy observed for detwinned Ba(Fe1-xCox)2As2 above the spin density wave transition
Nematicity, defined as broken rotational symmetry, has recently been observed in competing phases proximate to the superconducting phase in the cuprate high-temperature superconductors. Similarly,
Spin excitations in the nematic phase and the metallic stripe spin-density wave phase of iron pnictides
We present a general study of the magnetic excitations within a weak-coupling five-orbital model relevant to itinerant iron pnictides. As a function of enhanced electronic correlations, the spin
Near-degeneracy of several pairing channels in multiorbital models for the Fe pnictides
Weak-coupling approaches to the pairing problem in the iron pnictide superconductors have predicted a wide variety of superconducting ground states. We argue here that this is due both to the
Spin waves in the (0, π) and (0, π, π) ordered SDW states of the t-t' Hubbard model: application to doped iron pnictides.
TLDR
The ferro-antiferromagnetic states of the t-t' Hubbard model are found to be strongly stabilized at finite hole doping due to enhanced carrier-induced ferromagnetic spin couplings as in metallic ferromagnets.
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