Competition between stripe and checkerboard magnetic instabilities in Mn-doped BaFe2As2

G. S. Tucker; D. K. Pratt; M. G. Kim; S. Ran; A. Thaler; G. E. Granroth; K. Marty; W. Tian; J. L. Zarestky; M. D. Lumsden; S. L. Bud'ko; P. C. Canfield; A. Kreyssig; A. I. Goldman; R. J. McQueeney

doi:10.1103/PhysRevB.86.020503

Competition between stripe and checkerboard magnetic instabilities in Mn-doped BaFe2As2

Superconductivity 2012-07-16 v1

Authors: G. S. Tucker , D. K. Pratt , M. G. Kim , S. Ran , A. Thaler , G. E. Granroth , K. Marty , W. Tian , J. L. Zarestky , M. D. Lumsden , S. L. Bud'ko , P. C. Canfield , A. Kreyssig , A. I. Goldman , R. J. McQueeney

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Abstract

Inelastic neutron scattering measurements on Ba(Fe0.925Mn0.075)2As2 manifest spin fluctuations at two different wavevectors in the Fe square lattice, (1/2,0) and (1/2,1/2), corresponding to the expected stripe spin-density wave order and checkerboard antiferromagnetic order, respectively. Below T_N=80 K, long-range stripe magnetic ordering occurs and sharp spin wave excitations appear at (1/2,0) while broad and diffusive spin fluctuations remain at (1/2,1/2) at all temperatures. Low concentrations of Mn dopants nucleate local moment spin fluctuations at (1/2,1/2) that compete with itinerant spin fluctuations at (1/2,0) and may disrupt the development of superconductivity.

Keywords

mn-doped bafe2as2 magnetic instabilities stripe order checkerboard order inelastic neutron scattering spin fluctuations superconductivity

Cite

@article{arxiv.1206.3486,
  title  = {Competition between stripe and checkerboard magnetic instabilities in Mn-doped BaFe2As2},
  author = {G. S. Tucker and D. K. Pratt and M. G. Kim and S. Ran and A. Thaler and G. E. Granroth and K. Marty and W. Tian and J. L. Zarestky and M. D. Lumsden and S. L. Bud'ko and P. C. Canfield and A. Kreyssig and A. I. Goldman and R. J. McQueeney},
  journal= {arXiv preprint arXiv:1206.3486},
  year   = {2012}
}

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5 pages, 5 figures

Competition between stripe and checkerboard magnetic instabilities in Mn-doped BaFe2As2

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Keywords

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