Temperature dependence of the 4f quadrupole moment in heavy fermion systems

Vilen Zevin*, Gertrud Zwicknagl, Peter Fulde

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

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Abstract

The quadrupole moment of the 4f shell is a sensitive probe of the ground state and the low-energy excitations in heavy-fermion compounds. Its temperature dependence reflects the variation of the partial occupancies nf{hook}Jm(T) of the f-level split by a non-cubic crystalline electric field (CEF). A careful analysis of the quadrupole splitting therefore provides important information comparable to that obtained from the "classical" experiments such as the magnetic susceptibility, the LIII X-ray absorption data etc. The temperature dependent quadrupole moment Q(T) is calculated starting from the Anderson model of a rare earth impurity in the presence of a non-cubic CEF. The partial occupancies nf{hook}Jm(T) are evaluated from a simple ansatz which is valid at low temperature and can be deduced from the non-crossing approximation. Comparison of the calculations with recent Mössbauer measurements on YbCu2Si2 permits an identification of the characteristic parameters of this compound such as the characteristic low-temperature energy scale T0, the CEF splitting etc.

Original languageEnglish
Pages (from-to)475-477
Number of pages3
JournalJournal of Magnetism and Magnetic Materials
Volume76-77
Issue numberC
DOIs
StatePublished - 2 Dec 1988
Externally publishedYes

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