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Center for Nonlinear Studies |
While conventional L3-edge x-ray absorption near-edge structure (XANES) spectroscopy has proven to be a relatively easy and accurate way of measuring 4f-orbital occupancy in lanthanide materials, the utility of the technique in actinide materials is limited by the more delocalized nature of the 5f orbital. Some of these limitations can be deemphasized with resonant x-ray emission spectroscopy (RXES) techniques. In this talk, I will demonstrate all of these effects in a range of materials, showing examples of strong delocalization in transition metal systems, strong localization in lanthanide systems, and a mixture of effects in actinide systems, including results on a highly localized 5f system, UCd11, under applied pressure. All of these examples lead to a more in-depth discussion of recent results on URu2Si2 and how data on this material relate to measurements on dozens of other actinide intermetallic systems, consistent with a partially occupied and delocalized 5f orbital.
Host: Eric Bauer