We report a Fe Kβ x-ray emission spectroscopy study of local magnetic moments in various iron-based superconductors in their paramagnetic phases. Local magnetic moments are found in all samples studied: PrFeAsO, Ba( Fe,Co)2As2, LiFeAs, Fe1+x(Te,Se), and A 2Fe4Se5 (where A=K, Rb, and Cs). The moment size is independent of temperature or carrier concentration but varies significantly across different families. Specifically, all iron pnictide samples have local moments of about 1μB/Fe, while FeTe and K 2Fe4Se5 families have much larger local moments of ∼2μB/Fe and ∼3.3μB/Fe, respectively. Our results illustrate the importance of multiorbital physics in describing magnetism of these compounds.
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|Publication status||Published - 2011 Sep 22|
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics