Biquadratic magnetic interaction in parent ferropnictides

A. L. Wysocki; K. D. Belashchenko; L. Ke; M. Van Schilfgaarde; V. P. Antropov

doi:10.1088/1742-6596/449/1/012024

Biquadratic magnetic interaction in parent ferropnictides

A. L. Wysocki, K. D. Belashchenko, L. Ke, M. Van Schilfgaarde, V. P. Antropov

Research output: Contribution to journal › Conference paper › peer-review

10 Citations (Scopus)

Abstract

We discuss an effective spin Hamiltonian with biquadratic interaction for ferropnictide superconductors from the point of view of band structure theory and available experimental data. This model is consistent with electronic structure calculations and captures many observed magnetic properties, including the anisotropy of the exchange coupling, thin domain walls, and the crossover from first to second-order phase transition under doping. The parameters of the model are analyzed as a function of the local spin moment using first-principles calculations. Calculations show the biquadratic coupling is negative in stoichiometric KFe2Se2, and the phase diagram is extended into this region. We also consider magnetic short-range order and discuss the limitations of this model in comparison with experiment.

Original language	English
Article number	012024
Journal	Isnd 2007: Proceedings Of The 2007 International Symposium On Nonlinear Dynamics, Pts 1-4
Volume	449
Issue number	1
DOIs	https://doi.org/10.1088/1742-6596/449/1/012024
Publication status	Published - 2013

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10.1088/1742-6596/449/1/012024Licence: CC BY

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title = "Biquadratic magnetic interaction in parent ferropnictides",

abstract = "We discuss an effective spin Hamiltonian with biquadratic interaction for ferropnictide superconductors from the point of view of band structure theory and available experimental data. This model is consistent with electronic structure calculations and captures many observed magnetic properties, including the anisotropy of the exchange coupling, thin domain walls, and the crossover from first to second-order phase transition under doping. The parameters of the model are analyzed as a function of the local spin moment using first-principles calculations. Calculations show the biquadratic coupling is negative in stoichiometric KFe2Se2, and the phase diagram is extended into this region. We also consider magnetic short-range order and discuss the limitations of this model in comparison with experiment.",

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TY - JOUR

T1 - Biquadratic magnetic interaction in parent ferropnictides

AU - Wysocki, A. L.

AU - Belashchenko, K. D.

AU - Ke, L.

AU - Van Schilfgaarde, M.

AU - Antropov, V. P.

PY - 2013

Y1 - 2013

N2 - We discuss an effective spin Hamiltonian with biquadratic interaction for ferropnictide superconductors from the point of view of band structure theory and available experimental data. This model is consistent with electronic structure calculations and captures many observed magnetic properties, including the anisotropy of the exchange coupling, thin domain walls, and the crossover from first to second-order phase transition under doping. The parameters of the model are analyzed as a function of the local spin moment using first-principles calculations. Calculations show the biquadratic coupling is negative in stoichiometric KFe2Se2, and the phase diagram is extended into this region. We also consider magnetic short-range order and discuss the limitations of this model in comparison with experiment.

AB - We discuss an effective spin Hamiltonian with biquadratic interaction for ferropnictide superconductors from the point of view of band structure theory and available experimental data. This model is consistent with electronic structure calculations and captures many observed magnetic properties, including the anisotropy of the exchange coupling, thin domain walls, and the crossover from first to second-order phase transition under doping. The parameters of the model are analyzed as a function of the local spin moment using first-principles calculations. Calculations show the biquadratic coupling is negative in stoichiometric KFe2Se2, and the phase diagram is extended into this region. We also consider magnetic short-range order and discuss the limitations of this model in comparison with experiment.

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U2 - 10.1088/1742-6596/449/1/012024

DO - 10.1088/1742-6596/449/1/012024

M3 - Conference paper

AN - SCOPUS:84882975194

SN - 1742-6588

VL - 449

JO - Isnd 2007: Proceedings Of The 2007 International Symposium On Nonlinear Dynamics, Pts 1-4

JF - Isnd 2007: Proceedings Of The 2007 International Symposium On Nonlinear Dynamics, Pts 1-4

IS - 1

M1 - 012024

ER -

Biquadratic magnetic interaction in parent ferropnictides

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