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

Author

Listed:
  • 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
    College of Nuclear Science and Technology, Beijing Normal University)

  • 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
    Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, P. O. Box 603, Beijing 100190, China.)

  • Matthew B. Stone

    (Oak Ridge National Laboratory)

  • Wei Tian

    (Ames Laboratory and Department of Physics and Astronomy Iowa State University)

  • Jiangping Hu

    (Purdue University
    Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, P. O. Box 603, Beijing 100190, China.)

  • Pengcheng Dai

    (The University of Tennessee
    Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, P. O. Box 603, Beijing 100190, China.
    Oak Ridge National Laboratory)

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.

Suggested Citation

  • 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 & Pengcheng Dai, 2011. "Spin waves and magnetic exchange interactions in insulating Rb0.89Fe1.58Se2," Nature Communications, Nature, vol. 2(1), pages 1-6, September.
    • Handle: RePEc:nat:natcom:v:2:y:2011:i:1:d:10.1038_ncomms1573
    DOI: 10.1038/ncomms1573
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