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CeFePO: a heavy fermion metal with ferromagnetic correlations
E M Brüning1, C Krellner, M Baenitz
1Max Planck Institute for Chemical Physics of Solids, D-01187 Dresden, Germany.
Physical Review Letters
|October 15, 2008
Summary
CeFePO exhibits properties of a heavy fermion metal, characterized by strong electronic correlations from Ce-4f electrons and ferromagnetic correlations, positioning it near a ferromagnetic instability.
Area of Science:
- Condensed Matter Physics
- Materials Science
Background:
- CeFePO is a homologue of RFePnO1-xFx, a class of materials exhibiting high-temperature superconductivity.
- Understanding the ground state properties of such materials is crucial for developing new superconductors.
Purpose of the Study:
- To investigate the ground state properties of CeFePO.
- To determine the origin of strong electronic correlations and magnetic behavior.
Main Methods:
- Magnetic susceptibility measurements
- Specific heat measurements
- Electrical resistivity measurements
- Nuclear Magnetic Resonance (NMR) spectroscopy
Main Results:
- CeFePO is identified as a magnetically nonordered heavy fermion metal.
- Key parameters include a Kondo temperature (TK) of approximately 10 K, a Sommerfeld coefficient (γ) of 700 mJ/mol K2, and a mass enhancement factor of ~50.
- Strong electronic correlations originate from Ce-4f electrons, not Fe-3d electrons.
- Ferromagnetic correlations are present, indicated by an enhanced Sommerfeld-Wilson ratio (R=5.5) and a low Korringa product.
Conclusions:
- CeFePO exhibits characteristics of a heavy fermion system with significant electronic correlations.
- The compound is situated on the nonmagnetic side of a ferromagnetic instability.
- These findings provide insights into the electronic behavior of RFePnO1-xFx related materials.
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