Classification of strongly correlated f-electron systems View Full Text


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Article Info

DATE

1995-05

AUTHORS

Frank Steglich, Christoph Geibel, Robert Modler, Michael Lang, Peter Hellmann, Philipp Gegenwart

ABSTRACT

Ce-based heavy-fermion (HF) metals behave as Kondo-lattice systems and can be classified with the aid of a single coupling parameter, ¦J ¦/W,where J < 0is the local exchange integral and W the conduction-band width. Depending on its actual composition, the exemplary material CeCu2Si2chooses one out of two ground states: HF superconductivity and a new magnetic HF phase “A”. In a narrow composition range, these two phases are nearly degenerate and expell each other upon varying either the temperature or the external magnetic field. The one-parameter-scaling approach appears inapplicable to the U-based HF metals. For the exemplary material UPd2Al3, antiferromagnetic ordering between seemingly local 5f moments coexists, on a microscopic scale, with HF superconductivity. Whether this coexistence can be explained by assuming 5 f states localized on a tetravalent U-ion with non-magnetic crystal-field ground state remains to be shown. We discuss arguments which invokeitinerant 5 f states in the U-based HF metals to be distinguished from thelocalized 4f states in the Ce-based counterparts. More... »

PAGES

267-281

References to SciGraph publications

  • 1978-12. Specific heat of concentrated kondo systems: (La, Ce)Al2 and CeAl2 in ZEITSCHRIFT FÜR PHYSIK B CONDENSED MATTER
  • 1992-06. Neutron diffraction study of the heavy fermion superconductors UM2Al3(M=Pd, Ni) in ZEITSCHRIFT FÜR PHYSIK B CONDENSED MATTER
  • 1993-06. Model for heavy-fermion behavior of Nd1.8Ce0.2CuO4 in ZEITSCHRIFT FÜR PHYSIK B CONDENSED MATTER
  • 1991-02. Heavy-fermion superconductivity atTc=2K in the antiferromagnet UPd2Al3 in ZEITSCHRIFT FÜR PHYSIK B CONDENSED MATTER
  • 1991-10. A new heavy-fermion superconductor: UNi2Al3 in ZEITSCHRIFT FÜR PHYSIK B CONDENSED MATTER
  • 1994-04. Heavy fermions: Typical phenomena and recent developments in JOURNAL OF LOW TEMPERATURE PHYSICS
  • Identifiers

    URI

    http://scigraph.springernature.com/pub.10.1007/bf00752293

    DOI

    http://dx.doi.org/10.1007/bf00752293

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