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Heavy fermions: Typical phenomena and recent developments

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Abstract

A survey is given of typical phenomena, new materials and recent developments in heavy-fermion physics. In particular, the following topics are addressed: (i) YbNiAl, a new heavy-fermion local-moment antiferromagnet (LMM) with Néel temperature Tn = 3 K, (ii) “non-Fermi-liquid” behavior at the magnetic instability in two heavy-fermion systems with intact f-ion sublattice, i.e. orthorhombic CePt(Si1−xGex) and tetragonal U(Cu4+xAl8−x), (iii) the low-temperature properties of the anisotropic “Rondo insulator” CeNiSn, and (iv) some of the most unusual observations made on “low-carrier-density” rare-earth systems like Sm3Te4 and Sm3Se4. While the exotic symmetry-broken (superconducting and magnetic) ground states of heavy-fermion metals are discussed in several other contributions to this volume, we focus in the remainder of this paper on the relationship between LMM ordering and heavy-fermion superconductivity: Firstly, the LMM ordered compound CeCu2Ge2 (Tn = 4.1K) is addressed which was recently found to become a non-magnetic heavy-fermion superconductor under high hydrostatic pressure, p ≥ 70 kbar (D. Jaccard et al., Phys. Lett. A163,475 (1992)). Point-contact spectroscopy is used to investigate in more detail the high-pressure superconducting phase of CeCu2Ge2. Secondly, we summarize high-pressure results on UPd2Al3, the first compound to show homogeneous coexistence between LMM ordering and heavy-fermion superconductivity.

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Authors and Affiliations

  1. Institut für Festkörperphysik, Fachgebiet Technische Physik, SFB 252, Technische Hochschule Darmstadt, D-64289, Darmstadt, Germany

    F. Steglich, C. Geibel, K. Gloos, G. Olesch, C. Schank, C. Wassilew, A. Loidl, A. Krimmel & G. R. Stewart

  2. Institut für Festkörperphysik, Fachgebiet Experimentalphysik, SFB 252, Technische Hochschule Darmstadt, D-64289, Darmstadt, Germany

    A. Loidl

  3. Hahn-Meitner Institut, D-14109, Berlin-Wannsee, Germany

    A. Krimmel & G. R. Stewart

  4. Institut für Physik, Universität Augsburg, D-86159, Augsburg, Germany

    G. R. Stewart

  5. Department of Physics, University of Florida, 32611, Gainesville, Fla., USA

    G. R. Stewart

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  1. F. Steglich
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  2. C. Geibel
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  9. G. R. Stewart
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Steglich, F., Geibel, C., Gloos, K. et al. Heavy fermions: Typical phenomena and recent developments. J Low Temp Phys 95, 3–22 (1994). https://doi.org/10.1007/BF00754918

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