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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 Neel temperature T(N) = 3 K, (ii)
''non-Fermi-liquid'' behavior at the magnetic instability in two
heavy-fermion systems with intact from sublattice, i.e. orthorhombic
CePt(Si1-xGex) and tetragonal U(Cu4+xAl8-x), (iii) the low-temperature
properties of the anisotropic ''Kondo insulator'' CeNiSn, and (iv) some
of the most unusual observations made on ''low-carrier-density''
rare-earth systems like Sm3Te4 and Sm3Se4. While the ezotic
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 (T(N) = 4.1 K) is addressed which was
recently found to become a non-magnetic heavy-fermion superconductor
under high hydrostatic pressure, p greater-than-or-equal-to 70 kbar (D.
Jaccard et al., Phys. Lett. A 163,475 (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.
