Neutron scattering measurements of spatially anisotropic magnetic exchange interactions in semiconducting K0.85Fe1.54Se2 (TN=280 K)

Jun Zhao; Yao Shen; R. J. Birgeneau; Miao Gao; Zhong Yi Lu; D. H. Lee; X. Z. Lu; H. J. Xiang; D. L. Abernathy; Y. Zhao

doi:10.1103/PhysRevLett.112.177002

Neutron scattering measurements of spatially anisotropic magnetic exchange interactions in semiconducting K0.85Fe1.54Se2 (TN=280 K)

Jun Zhao, Yao Shen, R. J. Birgeneau, Miao Gao, Zhong Yi Lu, D. H. Lee, X. Z. Lu, H. J. Xiang, D. L. Abernathy, Y. Zhao

Direct Geometry

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

17 Scopus citations

Abstract

We use neutron scattering to study the spin excitations associated with the stripe antiferromagnetic order in semiconducting K0.85Fe1.54Se2 (TN=280K). We show that the spin-wave spectra can be accurately described by an effective Heisenberg Hamiltonian with highly anisotropic inplane couplings at T=5K. At high temperature (T=300K) above TN, short-range magnetic correlation with anisotropic correlation lengths are observed. Our results suggest that, despite the dramatic difference in the Fermi surface topology, the inplane anisotropic magnetic couplings are a fundamental property of the iron-based compounds; this implies that their antiferromagnetism may originate from local strong correlation effects rather than weak coupling Fermi surface nesting.

Original language	English
Article number	177002
Journal	Physical Review Letters
Volume	112
Issue number	17
DOIs	https://doi.org/10.1103/PhysRevLett.112.177002
State	Published - Apr 30 2014

Access to Document

10.1103/PhysRevLett.112.177002

Cite this

@article{b807d7bcbc9b43b988f25f74559a994f,

title = "Neutron scattering measurements of spatially anisotropic magnetic exchange interactions in semiconducting K0.85Fe1.54Se2 (TN=280 K)",

abstract = "We use neutron scattering to study the spin excitations associated with the stripe antiferromagnetic order in semiconducting K0.85Fe1.54Se2 (TN=280K). We show that the spin-wave spectra can be accurately described by an effective Heisenberg Hamiltonian with highly anisotropic inplane couplings at T=5K. At high temperature (T=300K) above TN, short-range magnetic correlation with anisotropic correlation lengths are observed. Our results suggest that, despite the dramatic difference in the Fermi surface topology, the inplane anisotropic magnetic couplings are a fundamental property of the iron-based compounds; this implies that their antiferromagnetism may originate from local strong correlation effects rather than weak coupling Fermi surface nesting.",

author = "Jun Zhao and Yao Shen and Birgeneau, {R. J.} and Miao Gao and Lu, {Zhong Yi} and Lee, {D. H.} and Lu, {X. Z.} and Xiang, {H. J.} and Abernathy, {D. L.} and Y. Zhao",

year = "2014",

month = apr,

day = "30",

doi = "10.1103/PhysRevLett.112.177002",

language = "English",

volume = "112",

journal = "Physical Review Letters",

issn = "0031-9007",

publisher = "American Physical Society",

number = "17",

}

TY - JOUR

T1 - Neutron scattering measurements of spatially anisotropic magnetic exchange interactions in semiconducting K0.85Fe1.54Se2 (TN=280 K)

AU - Zhao, Jun

AU - Shen, Yao

AU - Birgeneau, R. J.

AU - Gao, Miao

AU - Lu, Zhong Yi

AU - Lee, D. H.

AU - Lu, X. Z.

AU - Xiang, H. J.

AU - Abernathy, D. L.

AU - Zhao, Y.

PY - 2014/4/30

Y1 - 2014/4/30

N2 - We use neutron scattering to study the spin excitations associated with the stripe antiferromagnetic order in semiconducting K0.85Fe1.54Se2 (TN=280K). We show that the spin-wave spectra can be accurately described by an effective Heisenberg Hamiltonian with highly anisotropic inplane couplings at T=5K. At high temperature (T=300K) above TN, short-range magnetic correlation with anisotropic correlation lengths are observed. Our results suggest that, despite the dramatic difference in the Fermi surface topology, the inplane anisotropic magnetic couplings are a fundamental property of the iron-based compounds; this implies that their antiferromagnetism may originate from local strong correlation effects rather than weak coupling Fermi surface nesting.

AB - We use neutron scattering to study the spin excitations associated with the stripe antiferromagnetic order in semiconducting K0.85Fe1.54Se2 (TN=280K). We show that the spin-wave spectra can be accurately described by an effective Heisenberg Hamiltonian with highly anisotropic inplane couplings at T=5K. At high temperature (T=300K) above TN, short-range magnetic correlation with anisotropic correlation lengths are observed. Our results suggest that, despite the dramatic difference in the Fermi surface topology, the inplane anisotropic magnetic couplings are a fundamental property of the iron-based compounds; this implies that their antiferromagnetism may originate from local strong correlation effects rather than weak coupling Fermi surface nesting.

UR - http://www.scopus.com/inward/record.url?scp=84899760007&partnerID=8YFLogxK

U2 - 10.1103/PhysRevLett.112.177002

DO - 10.1103/PhysRevLett.112.177002

M3 - Article

AN - SCOPUS:84899760007

SN - 0031-9007

VL - 112

JO - Physical Review Letters

JF - Physical Review Letters

IS - 17

M1 - 177002

ER -

Neutron scattering measurements of spatially anisotropic magnetic exchange interactions in semiconducting K0.85Fe1.54Se2 (TN=280 K)

Abstract

Access to Document

Other files and links

Fingerprint

Cite this