Skutterudite Results Shed Light on Heavy Fermion Physics

Abstract

Only few selected examples among the great diversity of anomalous rare earth skutterudite are reviewed. Focus is first given on PrFe4P12 in comparison with URu2Si2. For PrFe4P12, great progress has been made on determining the nature of the order parameter (OP). A non magnetic order parameter with a multipolar component emerges here while for URu2Si2 the nature of the so-called hidden order remains mysterious. The two systems have several similarities in their temperature--pressure (T, P) and magnetic field--temperature (H, T) phase diagrams, in their spin dynamics, in their nesting character and in their high sensitivity to impurities. Advances on one side must stimulate new views on the other. Besides general considerations on the choice of the OP, a simple basic problem is the treatment of the Kondo coupling in a system with low charge carrier number for the cases of uncompensated and compensated semi-metal. An interesting problem is also the possible decoupling between exciton modes and itinerant carriers.

8 pages, 10 figures, proceedings of International Conference on "New Quantum Phenomena in Skutterudite and Related Systems"

References in corpus (8)

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• Gapped itinerant spin excitations account for missing entropy in the hidden order state of URu${}_2$Si${}_2$
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Cited by in corpus (11)

• Colloquium: Hidden Order, Superconductivity, and Magnetism -- The Unsolved Case of URu2Si2
• Complex Landau Ginzburg Theory of the Hidden Order in URu_2Si_2
• Field Reentrance of the Hidden Order State of URu2Si2 under Pressure
• Interplay of magnetism, Fermi surface reconstructions, and hidden-order in the heavy-fermion material URu${}_2$Si${}_2$
• Study of the magnetic properties of URu2Si2 under uniaxial stress by neutron scattering
• Neutron scattering studies on URu2Si2
• On the destruction of the hidden order in URu${}_2$Si${}_2$ by a strong magnetic field
• Trends in Heavy Fermion Matter
• Electronic Orders Induced by Kondo Effect in Non-Kramers f-Electron Systems
• Suppression of hidden order in URu2Si2 under pressure and restoration in magnetic field
• Raman Active High Energy Excitations in URu${}_2$Si${}_2$