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Classification of strongly correlated f-electron systems

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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 CeCu2Si2 chooses 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.

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Authors and Affiliations

  1. Institut fuer Festkoerperphysik, Technische Hochschule Darmstadt, D-64289, Darmstadt, Germany

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

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  1. Frank Steglich
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  2. Christoph Geibel
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  3. Robert Modler
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  4. Michael Lang
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  5. Peter Hellmann
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  6. Philipp Gegenwart
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Steglich, F., Geibel, C., Modler, R. et al. Classification of strongly correlated f-electron systems. J Low Temp Phys 99, 267–281 (1995). https://doi.org/10.1007/BF00752293

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