Neutron Scattering Measurements of Spatially Anisotropic Magnetic Exchange Interactions in Semiconducting ${\mathrm{K}}_{0.85}{\mathrm{Fe}}_{1.54}{\mathrm{Se}}_{2}$ (${T}_{N}=280\text{ }\text{ }\mathrm{K}$)

Neutron Scattering Measurements of Spatially Anisotropic Magnetic Exchange Interactions in Semiconducting $K_{0.85} {Fe}_{1.54} {Se}_{2}$ ( $T_{N} = 280 K$ )

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

Phys. Rev. Lett. 112, 177002 – Published 30 April 2014

Abstract

We use neutron scattering to study the spin excitations associated with the stripe antiferromagnetic order in semiconducting $K_{0.85} {Fe}_{1.54} {Se}_{2}$ ( $T_{N} = 280 K$ ). We show that the spin-wave spectra can be accurately described by an effective Heisenberg Hamiltonian with highly anisotropic inplane couplings at $T = 5 K$ . At high temperature ( $T = 300 K$ ) above $T_{N}$ , 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.

Received 12 November 2013

DOI:https://doi.org/10.1103/PhysRevLett.112.177002

Authors & Affiliations

Jun Zhao^1,*, Yao Shen¹, R. J. Birgeneau^2,3, Miao Gao⁴, Zhong-Yi Lu⁴, D.-H. Lee^2,5, X. Z. Lu¹, H. J. Xiang¹, D. L. Abernathy⁶, and Y. Zhao^7,8

¹State Key Laboratory of Surface Physics and Department of Physics, Fudan University, Shanghai 200433, China
²Department of Physics, University of California, Berkeley, California 94720, USA
³Department of Materials Science and Engineering, University of California, Berkeley, California 94720, USA
⁴Department of Physics, Renmin University of China, Beijing 100872, China
⁵Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
⁶Neutron Scattering Science Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6393, USA
⁷NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA
⁸Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742, USA

^*zhaoj@fudan.edu.cn

Article Text (Subscription Required)

Click to Expand

References (Subscription Required)

Click to Expand

Issue

Vol. 112, Iss. 17 — 2 May 2014

Reuse & Permissions

Access Options

Author publication services for translation and copyediting assistance advertisement

Physical Review Letters

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, and Y. Zhao

Phys. Rev. Lett. 112, 177002 – Published 30 April 2014

Abstract

Authors & Affiliations

Article Text (Subscription Required)

References (Subscription Required)

Issue

Access Options

Authorization Required

Other Options

Download & Share

Images

Figure 1

Figure 2

Figure 3

Figure 4

Log In

Search

Article Lookup

Paste a citation or DOI

Enter a citation

Neutron Scattering Measurements of Spatially Anisotropic Magnetic Exchange Interactions in Semiconducting $K_{0.85} {Fe}_{1.54} {Se}_{2}$ ( $T_{N} = 280 K$ )