Spin waves and magnetic exchange interactions in insulating Rb(0.89)Fe(1.58)Se(2)
| Title | Spin waves and magnetic exchange interactions in insulating Rb(0.89)Fe(1.58)Se(2) |
| Publication Type | Journal Article |
| Year of Publication | 2011 |
| Authors | Wang MY, Fang C, Yao DX, Tan GT, Harriger LW, Song Y, Netherton T, Zhang CL, Wang M, Stone MB, Tian W, Hu JP, Dai PC |
| Journal Title | Nature Communications |
| Volume | 2 |
| Pages | 580 |
| Date Published | 12/06 |
| Type of Article | Article |
| ISBN Number | 2041-1723 |
| Accession Number | WOS:000299159900012 |
| Keywords | superconductivity |
| Abstract | The parent compounds of iron pnictide superconductors are bad metals with a collinear antiferromagnetic structure and Neel temperatures below 220 K. Although alkaline iron selenide A(y)Fe(1.6+x)Se(2) (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 Neel temperatures of roughly 500 K. Here we show that the spin waves of the insulating antiferromagnet Rb(0.89)Fe(1.58)Se(2) 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 Rb(0.89)Fe(1.58)Se(2), (Ba,Ca,Sr)Fe(2)As(2), and Fe(1.05)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. |
| URL | <Go to ISI>://WOS:000299159900012 |
| DOI | 10.1038/ncomms1573 |
| Alternate Journal | Nat. Commun. |
