Orbital occupancy and charge doping in iron-based superconductors.

Cantoni, Claudia; Mitchell, Jonathan E; May, Andrew F; McGuire, Michael A; Idrobo, Juan-Carlos; Berlijn, Tom; Dagotto, Elbio; Chisholm, Matthew F et al. · Adv Mater · 2014

basic_science · Level V

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Record sourced from PubMed, PMID 25070045.
Also identified by DOI 10.1002/adma.201401518.
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Abstract

The intrinsic Fe local magnetic moment and Fe orbital occupations of iron-based superconductors are unveiled through the local, real-space capability of aberration-corrected scanning transmission electron microscopy/electron energy loss spectroscopy (STEM/EELS). Although the ordering of Fe moments needs to be suppressed for superconductivity to arise, the local, fluctuating Fe magnetic moment is enhanced near optimal superconductivity.

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