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.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Rosa PF,Adriano C,Garitezi TM,Grant T,Fisk Z,Urbano RR,Pagliuso PGdoi
10.1038/srep06543subject
Has Abstractpub_date
2014-10-08 00:00:00pages
6543issn
2045-2322pii
srep06543journal_volume
4pub_type
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