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Site specific spin dynamics in BaFe2As2: tuning the ground state by orbital differentiation.

Authors
  • Rosa, P F S
  • Adriano, C
  • Garitezi, T M
  • Grant, T
  • Fisk, Z
  • Urbano, R R
  • Pagliuso, P G
Type
Published Article
Journal
Scientific Reports
Publisher
Springer Nature
Publication Date
Jan 01, 2014
Volume
4
Pages
6543–6543
Identifiers
DOI: 10.1038/srep06543
PMID: 25292360
Source
Medline
License
Unknown

Abstract

The role of orbital differentiation on the emergence of superconductivity in the Fe-based superconductors remains an open question to the scientific community. In this investigation, we employ a suitable microscopic spin probe technique, namely Electron Spin Resonance (ESR), to investigate this issue on selected chemically substituted BaFe2As2 single crystals. As the spin-density wave (SDW) phase is suppressed, we observe a clear increase of the Fe 3d bands anisotropy along with their localization at the FeAs plane. Such an increase of the planar orbital content is interestingly independent of the chemical substitution responsible for suppressing the SDW phase. As a consequence, the magnetic fluctuations in combination with this particular symmetry of the Fe 3d bands are propitious ingredients for the emergence of superconductivity in this class of materials.

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