Abstract
Recent experiments on heavy‐fermion systems have focused on the following issues: (i) non‐Fermi‐liquid behavior occurring either because of cooperative effects at a magnetic instability, i.e. at a T=0 phase transition between magnetically ordered and nonmagnetic groundstates driven by parameters such as chemical composition or pressure, or because of single‐ion effects such as the two‐channel Kondo effect or a distribution of Kondo temperatures; (ii) the symmetry of the order parameter in heavy‐fermion superconductors and the interplay of (often weak) magnetism and superconductivity. A review of recent developments in these areas is given.
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