@article{ed60d58c525c48448d4fc448cf70c353,
title = "Spin waves and magnetic exchange interactions in insulating Rb 0.89Fe1.58Se2",
abstract = "The parent compounds of iron pnictide superconductors are bad metals with a collinear antiferromagnetic structure and N{\'e}el 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 N{\'e}el temperatures of roughly 500 K. Here we show that the spin waves of the insulating antiferromagnet Rb 0.89Fe1.58Se2 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 Rb0.89Fe 1.58Se2, (Ba,Ca,Sr)Fe2As2, and Fe1.05 Te 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.",
author = "Miaoyin Wang and Chen Fang and Yao, {Dao Xin} and Guotai Tan and Harriger, {Leland W.} and Yu Song and Tucker Netherton and Chenglin Zhang and Meng Wang and Stone, {Matthew B.} and Wei Tian and Jiangping Hu and Pengcheng Dai",
year = "2011",
doi = "10.1038/ncomms1573",
language = "English",
volume = "2",
journal = "Nature Communications",
issn = "2041-1723",
publisher = "Nature Research",
number = "1",
}