Anomalous magnetic response of the valence-fluctuating compound YbInCu4
J. K. Freericks (Georgetown University), V. Zlatic (Georgetown, University, Institute of Physics, Zagreb University)
TL;DR
This paper uses an exact solution of a theoretical model to explain the unusual magnetic behavior in Yb-based valence-fluctuating compounds, linking entropy-driven transitions to observed magnetic and resistivity anomalies.
Contribution
It provides a theoretical explanation for the anomalous magnetic response in YbInCu4 using the Falicov-Kimball model with random hopping.
Findings
Explains anomalous magnetic response via entropy-driven local-moment--nonmagnetic transition.
Accounts for metamagnetism observed in Yb-based compounds.
Describes resistivity anomalies linked to valence fluctuations.
Abstract
The exact solution of the spin one-half Falicov-Kimball model, with random hopping between the lattice sites, is used to explain the anomalous magnetic response of Yb-based valence-fluctuating intermetallic compounds. The anomalous behavior arises from an entropy-driven local-moment--nonmagnetic transition of unhybridized Yb ions in these materials which can also be used to explain the observed metamagnetism and resistivity anomalies.
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Taxonomy
TopicsRare-earth and actinide compounds · Physics of Superconductivity and Magnetism · High-pressure geophysics and materials