A Model for the Schottky Anomaly in Metallic \(Nd_{2-y}Ce_{y}CuO_{4}\)

We present a simple model for the doped compound \(Nd_{2-y}Ce_{y}CuO_{4}\), in order to explain some recent experimental results on the latter. Within a Hartree-Fock context, we start from an impurity Anderson-like model and consider the magnetic splitting of the \(Nd\)-\(4f\) ground state Kramers d...

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Bibliographic Details
Published inarXiv.org
Main Authors Lagos, R E, Stein-Barana, A C M, Cabrera, G G
Format Paper
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 12.10.1998
Subjects
Curie temperature
Fermi liquids
Heat exchange
Magnetic permeability
Neodymium
Specific heat
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Summary:We present a simple model for the doped compound \(Nd_{2-y}Ce_{y}CuO_{4}\), in order to explain some recent experimental results on the latter. Within a Hartree-Fock context, we start from an impurity Anderson-like model and consider the magnetic splitting of the \(Nd\)-\(4f\) ground state Kramers doublet due to exchange interactions with the ordered \(Cu\) moments. Our results are in very good agreement with the experimental data, yielding a Schottky anomaly peak for the specific heat that reduces its amplitude, broadens and shifts to lower temperatures, upon \(Ce\) doping. For overdoped compounds at low temperatures, the specific heat behaves linearly and the magnetic susceptibility is constant. A smooth transition from this Fermi liquid like behavior ocurrs as temperature is increased and at high temperatures the susceptibility exhibits a Curie-like behavior. Finally, we discuss some improvements our model is amenable to incorporate.
ISSN:2331-8422
DOI:10.48550/arxiv.9807337