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Anisotropic magnetic excitations and incipient Néel order in Ba(Fe1−xMnx)2As2


Garcia, Fernando A; Ivashko, Oleh; McNally, Daniel E; Das, Lakshmi; Piva, Mario M; Adriano, C; Pagliuso, Pascoal G; Chang, Johan; Schmitt, Thorsten; Monney, Claude (2019). Anisotropic magnetic excitations and incipient Néel order in Ba(Fe1−xMnx)2As2. Physical review. B, 99(11):115118.

Abstract

It is currently understood that high temperature superconductivity (SC) in the transition metal (M) substituted iron arsenides Ba(Fe1−xMx)2As2 is promoted by magnetic excitations with wave vectors (π,0) or (0,π). It is known that while a small amount of Co substitution lead to SC, the same does not occur for Mn for any value of x. In this work, magnetic excitations in the iron arsenides Ba(Fe1−xMnx)2As2(x=0.0,0.007,0.009,0.08) are investigated by means of resonant inelastic x-ray scattering (RIXS) at the Fe L3 edge, for momentum transfer q along the high symmetry Brillouin zone (π,0) and (π,π) directions. It is shown that with increasing Mn content (x), the excitations become anisotropic both in dispersion and lineshape. Both effects are detected even for small values of x, evidencing a cooperative phenomenon between the Mn impurities, that we ascribe to emerging Néel order of the Mn spins. Moreover, for x=0.08, the excitations along q∥(π,0) are strongly damped and nearly nondispersive. This result suggests that phases of arsenides containing local moments at the FeAs layers, as in Mn or Cr substituted phases, do not support high temperature SC due to the absence of the appropriate magnetic excitations.

Abstract

It is currently understood that high temperature superconductivity (SC) in the transition metal (M) substituted iron arsenides Ba(Fe1−xMx)2As2 is promoted by magnetic excitations with wave vectors (π,0) or (0,π). It is known that while a small amount of Co substitution lead to SC, the same does not occur for Mn for any value of x. In this work, magnetic excitations in the iron arsenides Ba(Fe1−xMnx)2As2(x=0.0,0.007,0.009,0.08) are investigated by means of resonant inelastic x-ray scattering (RIXS) at the Fe L3 edge, for momentum transfer q along the high symmetry Brillouin zone (π,0) and (π,π) directions. It is shown that with increasing Mn content (x), the excitations become anisotropic both in dispersion and lineshape. Both effects are detected even for small values of x, evidencing a cooperative phenomenon between the Mn impurities, that we ascribe to emerging Néel order of the Mn spins. Moreover, for x=0.08, the excitations along q∥(π,0) are strongly damped and nearly nondispersive. This result suggests that phases of arsenides containing local moments at the FeAs layers, as in Mn or Cr substituted phases, do not support high temperature SC due to the absence of the appropriate magnetic excitations.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:530 Physics
Language:English
Date:14 March 2019
Deposited On:04 Jun 2019 16:02
Last Modified:25 Sep 2019 00:35
Publisher:American Physical Society
ISSN:2469-9950
OA Status:Green
Publisher DOI:https://doi.org/10.1103/physrevb.99.115118
Project Information:
  • : FunderSNSF
  • : Grant IDPP00P2_170597
  • : Project TitleInvestigating the ultrafast dynamics of Mott correlations
  • : FunderSNSF
  • : Grant IDBSSGI0_155873
  • : Project TitleQuantum MAny-body Physics in Solids
  • : FunderSNSF
  • : Grant IDPZ00P2_154867
  • : Project TitleTime- and angle-resolved photoemission spectroscopy on correlated materials

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