Phase diagram of heavy fermion systems

Details Phase diagram of heavy fermion systems Phase diagram of heavy fermion systems

2003-06-06

arxiv.org/abs/cond-mat/0306157v1

Physics

Condensed Matter

Strongly Correlated Electrons

submitted ICM2003

Scientific paper

10.1016/j.jmmm.2003.11.030

The Meccano of heavy fermion systems is shown on different cases going from anomalous monochalcogenides to cerium intermetallic compounds with special focus on the ideal case of the CeRu2Si2 series. Discussion is made in the frame of the interplay between valence, electronic structure (Fermi surface), and magnetism. The nice tools given by the temperature, the pressure, and the magnetic field allow to explore different ground states as well as the slow downhill ''race'' before reaching a Fermi liquid finish line at very low temperature. Experimentally, the Gr"uneisen parameter i.e. the ratio of the thermal expansion by the specific heat is a coloured magic number; its temperature, pressure, and magnetic field dependence is a deep disclosure of competing hierarchies and the conversion of this adaptive matter to external responses.

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