Weak spin interactions in Mott insulating La2O2Fe2OSe2

E. E. McCabe; C. Stock; E. E. Rodriguez; A. S. Wills; J. W. Taylor; J. S. O. Evans

doi:10.1103/PhysRevB.89.100402

Weak spin interactions in Mott insulating La2O2Fe2OSe2

E. E. McCabe^*
, C. Stock
, E. E. Rodriguez
, A. S. Wills
, J. W. Taylor
, J. S. O. Evans

^*Corresponding author for this work

School of Physics and Astronomy

Research output: Contribution to journal › Article › peer-review

Abstract

understanding the mechanism for their high-temperature superconductivity. We present an investigation into the magnetic interactions in the Mott insulator La2O2Fe2OSe2. This iron oxyselenide adopts a 2-k magnetic structure with low levels of magnetic frustration. This magnetic ground state is found to be dominated by next-nearest-neighbor interactions J(2) and J(2') and the magnetocrystalline anisotropy of the Fe2+ site, leading to 2D-Ising-like spin S = 2 fluctuations. In contrast to calculations, the values are small and confine the spin excitations below 25 meV. This is further corroborated by sum rules of neutron scattering. This indicates that superconductivity in related materials may derive from a weakly coupled and unfrustrated magnetic structure.

Original language	English
Article number	100402
Number of pages	5
Journal	Physical review B
Volume	89
Issue number	10
DOIs	https://doi.org/10.1103/PhysRevB.89.100402
Publication status	Published - 10 Mar 2014

Keywords / Materials (for Non-textual outputs)

HIGH-TEMPERATURE SUPERCONDUCTIVITY
IRON PNICTIDES
CHALCOGENIDES
WAVES

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10.1103/PhysRevB.89.100402

Chris Stock
- cstocked.acuk
- School of Physics and Astronomy - Personal Chair of Neutron Spectroscopy
Person: Academic: Research Active

Cite this

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title = "Weak spin interactions in Mott insulating La2O2Fe2OSe2",

abstract = "understanding the mechanism for their high-temperature superconductivity. We present an investigation into the magnetic interactions in the Mott insulator La2O2Fe2OSe2. This iron oxyselenide adopts a 2-k magnetic structure with low levels of magnetic frustration. This magnetic ground state is found to be dominated by next-nearest-neighbor interactions J(2) and J(2') and the magnetocrystalline anisotropy of the Fe2+ site, leading to 2D-Ising-like spin S = 2 fluctuations. In contrast to calculations, the values are small and confine the spin excitations below 25 meV. This is further corroborated by sum rules of neutron scattering. This indicates that superconductivity in related materials may derive from a weakly coupled and unfrustrated magnetic structure.",

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year = "2014",

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day = "10",

doi = "10.1103/PhysRevB.89.100402",

language = "English",

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T1 - Weak spin interactions in Mott insulating La2O2Fe2OSe2

AU - McCabe, E. E.

AU - Stock, C.

AU - Rodriguez, E. E.

AU - Wills, A. S.

AU - Taylor, J. W.

AU - Evans, J. S. O.

PY - 2014/3/10

Y1 - 2014/3/10

N2 - understanding the mechanism for their high-temperature superconductivity. We present an investigation into the magnetic interactions in the Mott insulator La2O2Fe2OSe2. This iron oxyselenide adopts a 2-k magnetic structure with low levels of magnetic frustration. This magnetic ground state is found to be dominated by next-nearest-neighbor interactions J(2) and J(2') and the magnetocrystalline anisotropy of the Fe2+ site, leading to 2D-Ising-like spin S = 2 fluctuations. In contrast to calculations, the values are small and confine the spin excitations below 25 meV. This is further corroborated by sum rules of neutron scattering. This indicates that superconductivity in related materials may derive from a weakly coupled and unfrustrated magnetic structure.

AB - understanding the mechanism for their high-temperature superconductivity. We present an investigation into the magnetic interactions in the Mott insulator La2O2Fe2OSe2. This iron oxyselenide adopts a 2-k magnetic structure with low levels of magnetic frustration. This magnetic ground state is found to be dominated by next-nearest-neighbor interactions J(2) and J(2') and the magnetocrystalline anisotropy of the Fe2+ site, leading to 2D-Ising-like spin S = 2 fluctuations. In contrast to calculations, the values are small and confine the spin excitations below 25 meV. This is further corroborated by sum rules of neutron scattering. This indicates that superconductivity in related materials may derive from a weakly coupled and unfrustrated magnetic structure.

KW - HIGH-TEMPERATURE SUPERCONDUCTIVITY

KW - IRON PNICTIDES

KW - CHALCOGENIDES

KW - WAVES

U2 - 10.1103/PhysRevB.89.100402

DO - 10.1103/PhysRevB.89.100402

M3 - Article

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JO - Physical review B

JF - Physical review B

IS - 10

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ER -

Weak spin interactions in Mott insulating La2O2Fe2OSe2

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Keywords / Materials (for Non-textual outputs)

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