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SUMMARY:Spin-Orbit and Crystal Field excitations in Cerium compounds probe
 d by Resonant Inelastic X-ray Scattering
DTSTART:20140205T160000
DTSTAMP:20260928T184344Z
UID:ec2688eb64f4752102544d0adf59b95790fae67369ebbda073159897
CATEGORIES:Conferences - Seminars
DESCRIPTION:Mauro FanciulliCandidate for a PhD position\nThe 4f electronic
  structure of Cerium atoms is dominated by Spin-Orbit coupling which produ
 ces a split into a 2F5/2 state and a 2F7/2 state\, but the interaction wit
 h the non-spherical electrostatic field generated by the surrounding charg
 es in an actual compound\, called Crystal Field\, produces a further split
 ting of the (2j +1)-fold degeneracy because of a lowering of symmetry.\nIn
  order to probe low energy excitations in Cerium we performed X-ray Absorp
 tion Spectroscopy (XAS) and Resonant Inelastic X-ray Scattering (RIXS) on 
 Nd1.84Ce0.16CuO4\, CeRu2P2 and CeCu2Si2. The valence of Cerium in the thre
 e compounds is 3+\, 4+ and mixed respectively. The different electronic oc
 cupation causes different scattering processes when we perform RIXS.\nSpin
 -Orbit excitations are measured in the Ce3+ samples with an energy of 300 
 meV\, which is comparable to previous ARPES measurements. In addition\, hi
 nts of Crystal Field excitations are observed around 50 meV for the first 
 time by means of X-rays\, qualitatively in agreement with atomic multiplet
  calculations performed with parameters obtained by Inelastic Neutron Scat
 tering.\nMeasurements were performed at beamline ID08 of the European Sync
 hrotron Radiation Facility (ESRF)\, Grenoble.
LOCATION:PH H 333 http://plan.epfl.ch/?room=PH%20H3%2033
STATUS:CONFIRMED
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