Theory of Electric Quadrupole Transition in the XMCD Spectra at the Yb L3 Edge of Mixed Valence Yb Compounds in High Magnetic Fields

The spectra of X-ray magnetic circular dichroism by the electric quadrupole transition (EQ-XMCD) are theoretically studied at the Yb L3 edge of mixed valence compounds, YbInCu4 and YbAgCu4, around the field-induced valence transition in high magnetic fields. Using a new formulation with a single imp...

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Bibliographic Details
Published inJournal of physics. Conference series Vol. 430; no. 1
Main Author Kotani, Akio
Format Journal Article
LanguageEnglish
Published Bristol IOP Publishing 22.04.2013
Subjects
Angular momentum
Dichroism
Ground state
Magnetic fields
Physics
Quadrupoles
Spectra
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Summary:The spectra of X-ray magnetic circular dichroism by the electric quadrupole transition (EQ-XMCD) are theoretically studied at the Yb L3 edge of mixed valence compounds, YbInCu4 and YbAgCu4, around the field-induced valence transition in high magnetic fields. Using a new formulation with a single impurity Anderson model, which directly connects the EQ-XMCD spectra with the weights of the Yb 4f angular momentum jz in the ground state, we show that the EQ-XMCD intensity of YbAgCu4 is more than twice as large as that of YbInCu4. This explains the reason for that the EQ-XMCD spectra was very recently measured successfully for YbAgCu4, whereas no experimental evidence of EQ-XMCD has so far been obtained for YbInCu4. Different EQ-XMCD intensities for the two materials and a peculiar field dependence of EQ-XMCD intensities are discussed on the basis of the weights of jz in the ground state.
ISSN:1742-6588
1742-6596
DOI:10.1088/1742-6596/430/1/012002