2014
DOI: 10.1038/srep06543
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Site specific spin dynamics in BaFe2As2: tuning the ground state by orbital differentiation

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 … Show more

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Cited by 8 publications
(13 citation statements)
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“…Recent reported ESR measurements also revealed an increase of both anisotropy and localization of the Fe 3d bands at the FeAs plane in Eu 1−x Ba x Fe 2 As 2 with increasing x content 29,30 . Moreover, ESR data also pointed to a similar density of states for both under and overdoped Ba 1−x Eu x Fe 2 As 2 compounds.…”
Section: Resultsmentioning
confidence: 83%
“…Recent reported ESR measurements also revealed an increase of both anisotropy and localization of the Fe 3d bands at the FeAs plane in Eu 1−x Ba x Fe 2 As 2 with increasing x content 29,30 . Moreover, ESR data also pointed to a similar density of states for both under and overdoped Ba 1−x Eu x Fe 2 As 2 compounds.…”
Section: Resultsmentioning
confidence: 83%
“…Small variations of γ across different compositions would not alter our main conclusions, as we discuss below. Moreover, the nearly constant ESR g-shift value found for the various ESR probes as a function of different chemical substitutions in Ba122 compounds is a strong evidence that the density of states at the Fermi level is nearly the same for pure Ba122 and for all studied compounds [13]. The choice of T c,0 = 26 K is a more subtle issue.…”
mentioning
confidence: 89%
“…Besides revealing the presence of localized moments, ESR also allows us to extract the averaged squared exchange coupling J 2 (q) between the localized moments and the conduction electrons from the linear increase of the linewidth with temperature (Korringa behavior) (see Table I) [12,13,15,31,37,38]. In a general approach for single-band metals, the thermal broadening b of the ESR linewidth ∆H 1/T 1 is the linear well-known Korringa relaxation defined as [32].…”
mentioning
confidence: 99%
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