Spin waves and magnetic exchange interactions in insulating Rb0.89Fe1.58Se2

Miaoyin Wang, Chen Fang, Dao-Xin Yao, GuoTai Tan, Leland W. Harriger, Yu Song, Tucker Netherton, Chenglin Zhang, Meng Wang, Matthew B. Stone, Wei Tian, Jiangping Hu and Pengcheng Dai ()
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Miaoyin Wang: The University of Tennessee
Chen Fang: Purdue University
Dao-Xin Yao: State Key Laboratory of Optoelectronic Materials and Technologies, Sun Yat-sen University
GuoTai Tan: The University of Tennessee
Leland W. Harriger: The University of Tennessee
Yu Song: The University of Tennessee
Tucker Netherton: The University of Tennessee
Chenglin Zhang: The University of Tennessee
Meng Wang: The University of Tennessee
Matthew B. Stone: Oak Ridge National Laboratory
Wei Tian: Ames Laboratory and Department of Physics and Astronomy Iowa State University
Jiangping Hu: Purdue University
Pengcheng Dai: The University of Tennessee

Nature Communications, 2011, vol. 2, issue 1, 1-6

Abstract: Abstract The parent compounds of iron pnictide superconductors are bad metals with a collinear antiferromagnetic structure and Néel temperatures below 220 K. Although alkaline iron selenide AyFe1.6+xSe2 (A=K, Rb, Cs) superconductors are isostructural with iron pnictides, in the vicinity of the undoped limit they are insulators, forming a block antiferromagnetic order and having Néel temperatures of roughly 500 K. Here we show that the spin waves of the insulating antiferromagnet Rb0.89Fe1.58Se2 can be accurately described by a local moment Heisenberg Hamiltonian. A fitting analysis of the spin wave spectra reveals that the next-nearest neighbour couplings in Rb0.89Fe1.58Se2, (Ba,Ca,Sr)Fe2As2, and Fe1.05Te are of similar magnitude. Our results suggest a common origin for the magnetism of all the Fe-based superconductors, despite having different ground states and antiferromagnetic orderings.

Date: 2011
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DOI: 10.1038/ncomms1573

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