Truly bulk-sensitive spectroscopic measurements of valence in heavy fermion materials

Claudia Dallera, Marco Grioni, Abhay Shukla, G. Vankó, John L. Sarrao

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Intermediate valence is one of the typical phenomena of systems with strong electronic correlation. The Anderson impurity model predicts a scaling of the valence with the reduced temperature T/TK, which is difficult to observe by traditional surface-sensitive electronic spectro-scopies. This paper presents results obtained by resonant inelastic X-ray scattering (RIXS), a bulk-sensitive configuration- and chemical-specific technique. The temperature dependence of the valence of YbInCu4 and YbAgCu4 was measured by tuning the incident energy to the resonance of the Yb2+ spectral component. In the case of YbInCu4 a sharp valence transition, as known from thermodynamical measurements, has been found. The valence of YbAgCu4 reveals a smooth dependence consistent with a Kondo temperature TK = 70 K. These findings establish RIXS as a powerful tool for measuring bulk electronic properties of solids.

Original languageEnglish
Pages (from-to)242-245
Number of pages4
JournalJournal of Synchrotron Radiation
Volume9
Issue number4
DOIs
Publication statusPublished - Jul 1 2002

Fingerprint

Fermions
Inelastic scattering
fermions
X ray scattering
valence
Electronic properties
Temperature
electronics
Tuning
Impurities
scattering
x rays
tuning
scaling
impurities
temperature dependence
temperature
configurations

Keywords

  • Anderson impurity model
  • Heavy fermions
  • Kondo behaviour
  • Mixed valence
  • Rare earths
  • RIXS
  • Ytterbium

ASJC Scopus subject areas

  • Instrumentation
  • Atomic and Molecular Physics, and Optics
  • Radiation
  • Physics and Astronomy (miscellaneous)

Cite this

Truly bulk-sensitive spectroscopic measurements of valence in heavy fermion materials. / Dallera, Claudia; Grioni, Marco; Shukla, Abhay; Vankó, G.; Sarrao, John L.

In: Journal of Synchrotron Radiation, Vol. 9, No. 4, 01.07.2002, p. 242-245.

Research output: Contribution to journalArticle

Dallera, Claudia ; Grioni, Marco ; Shukla, Abhay ; Vankó, G. ; Sarrao, John L. / Truly bulk-sensitive spectroscopic measurements of valence in heavy fermion materials. In: Journal of Synchrotron Radiation. 2002 ; Vol. 9, No. 4. pp. 242-245.
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