Many-body effects in nonresonant and resonant 4p spectroscopy of Gd metal

@article{ ISI:000082478600086,
Author = {Tagliaferri, A and Braicovich, L and van der Laan, G and Ghiringhelli, G
   and Brookes, NB and Dallera, C and Finazzi, M and Weschke, E and Hu, Z
   and Kaindl, G},
Title = {{Many-body effects in nonresonant and resonant 4p spectroscopy of Gd
   metal}},
Journal = {{PHYSICAL REVIEW B}},
Year = {{1999}},
Volume = {{60}},
Number = {{8}},
Pages = {{5728-5736}},
Month = {{AUG 15}},
Abstract = {{We present experimental and theoretical results on 4p spectroscopy from
   Gd metal with the aim to clarify in detail the effects of the final
   state interaction between the 4p and 4d levers which is of paramount
   importance in 4p spectroscopy of rare earths- and their nearby preceding
   elements in the Periodic Table. In the nonresonant mode the problem was
   studied with photoemission (XPS at hv=1140 eV), where XPS denotes x-ray
   photoemission. In the M-4,M-5 resonant mode the problem was addressed
   with x-ray scattering with inner shell excitation, leading to final
   state with a 4p hole {[}resonant Raman scattering (RRS)I. Nonresonant
   photoemission spectra are calculated using a full multiplet splitting
   approach including final state configuration interaction (CI) with the
   4d(8)4f(8) configuration which is close in energy to the 4p(5)4f(7)
   configuration leading to a coherent superposition of the 4p hole with
   two 4d holes in the final state. The calculated photoemission spectra
   agree well with the experiment and are used as a guideline to discuss
   the RRS data. In both cases (XPS and RRS) we point out the
   characteristic signature of the interaction with the configuration
   containing two 4d holes. This leads to high energy excitations in the
   final state, typically 20 eV above the main lines, with a spectral
   distribution over an energy scale that cannot be explained by ordinary
   multiplet splitting. On the other hand, we demonstrate that multiplet
   splitting cannot be neglected with respect to the above mentioned CI.
   RRS shows clearly that the CI is stronger in the 4p,, than in the
   4P(3/2) case in agreement with calculated average energies. When the
   excitation energy increases above Mg the Raman component becomes broader
   than with excitation at threshold. This is interpreted as evidence for
   the increasing importance of excitations with lower spin. Besides the
   dispersive (Raman) component the RRS spectra show a strong nondispersive
   peak at constant scattered-photon energy. This behavior is briefly
   discussed in connection with the dynamics of the excited state.
   {[}S0163-1829(99)11931-3].}},
Publisher = {{AMER PHYSICAL SOC}},
Address = {{ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA}},
Type = {{Article}},
Language = {{English}},
Affiliation = {{Tagliaferri, A (Corresponding Author), Politecn Milan, Dipartimento Fis, INFM, Piazza Leonardo da Vinci 32, I-20133 Milan, Italy.
   Politecn Milan, Dipartimento Fis, INFM, I-20133 Milan, Italy.
   SERC, Daresbury Lab, Warrington WA4 4AD, Cheshire, England.
   European Synchrotron Radiat Facil, F-38043 Grenoble, France.
   INFM, TASC, Elettra Synchrotron Light Source, I-34012 Trieste, Italy.
   Free Univ Berlin, Inst Expt Phys, D-14195 Berlin, Germany.}},
DOI = {{10.1103/PhysRevB.60.5728}},
ISSN = {{1098-0121}},
EISSN = {{1550-235X}},
Keywords-Plus = {{RAY-EMISSION-SPECTROSCOPY; MAGNETIC CIRCULAR-DICHROISM;
   INELASTIC-SCATTERING; RAMAN-SCATTERING; SYNCHROTRON-RADIATION;
   PHOTOELECTRON-SPECTRA; ELECTRON INTERACTIONS; MULTIPLET STRUCTURE;
   HELICAL UNDULATOR; CORE LEVELS}},
Research-Areas = {{Materials Science; Physics}},
Web-of-Science-Categories  = {{Materials Science, Multidisciplinary; Physics, Applied; Physics,
   Condensed Matter}},
ResearcherID-Numbers = {{Ghiringhelli, Giacomo/D-1159-2014
   Brookes, Nicholas B/C-6718-2019
   Tagliaferri, Alberto/L-2903-2015
   Hu, Zhiwei/B-8635-2008
   Finazzi, Marco/M-7401-2015
   van der Laan, Gerrit/Q-1662-2015
   Weschke, Eugen/J-4404-2013
   }},
ORCID-Numbers = {{Ghiringhelli, Giacomo/0000-0003-0867-7748
   Brookes, Nicholas B/0000-0002-1342-9530
   Tagliaferri, Alberto/0000-0001-8001-1786
   Finazzi, Marco/0000-0002-9197-3654
   van der Laan, Gerrit/0000-0001-6852-2495
   Weschke, Eugen/0000-0002-2141-0944
   Braicovich, Lucio/0000-0001-6548-9140}},
Number-of-Cited-References = {{34}},
Times-Cited = {{10}},
Usage-Count-Last-180-days = {{0}},
Usage-Count-Since-2013 = {{3}},
Journal-ISO = {{Phys. Rev. B}},
Doc-Delivery-Number = {{234HL}},
Unique-ID = {{ISI:000082478600086}},
DA = {{2020-12-22}},
}