✦ LIBER ✦

Different routes to heavy fermion behaviour

✍ Scribed by Peter Fulde; Gertrud Zwicknagl

Book ID: 103939177
Publisher: Elsevier Science
Year: 1995
Tongue: English
Weight: 272 KB
Volume: 206-207
Category: Article
ISSN: 0921-4526
DOI: 10.1016/0921-4526(94)00383-7

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✦ Synopsis

The conventional route to heavy-fermion behaviour is via a Kondo lattice system. Thereby a lattice of 4f-or 5f-ions couples weakly to a system of weakly correlated conduction electrons. Singlets are formed which lock together at low temperatures and give rise to coherent low lying quasiparticle excitations. Examples are a number of intermetallic compounds involving Ce or U ions, like CeRu2Si 2 or UPt 3. But when the conduction electrons are strongly correlated as in Nd2_xCexCuO 4 a different effect related to the Zeeman splitting seems to be responsible for the formation of heavy quasiparticle excitations. Various aspects and consequences of the two different origins of heavy fermion systems are discussed.

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