CePt3Si is a novel heavy fermion superconductor, crystallizing in the CePt3B structure as a tetragonally distorted low symmetry variant of the AuCu3 structure type. CePt3Si exhibits antiferromagnetic order at T(N) approximately 2.2 K and enters into a heavy fermion superconducting state at T(c) approximately 0.75 K. Large values of H(')(c2) approximately -8.5 T/K and H(c2)(0) approximately 5 T refer to heavy quasiparticles forming Cooper pairs. Hitherto, CePt3Si is the first heavy fermion superconductor without a center of symmetry.
Thermal conductivity of superconducting MgB 2 was studied in both the superconducting and the normal state region. The latter is almost equally determined by the electronic -and the lattice contribution to the total thermal conductivity. In the superconducting state, however, the lattice contribution is larger. The electronic thermal conductivity below T c was derived from the experimental data considering the Bardeen-Rickayzen-Tewordt theory together with the model of Geilikman. The analysis shows that electron scattering on static imperfections dominates.
Various concentrations of the solid solution
Yb2Pd2In1−xSnx ranging from
x = 0 to 1 with
the tetragonal Mo2FeB2-type structure were prepared and their physical properties were studied by means of bulk
and spectroscopic measurements as a function of temperature, pressure and magnetic fields.
Results deduced from these studies indicate a slight variation of the valency of the Yb ions,
from for both border compounds to
ν = 3 at
x = 0.6. This
variation gives rise to the appearance of long range magnetic order in a narrow concentration region
around x = 0.6, while both border compounds remain non-magnetic. The outstanding concentration
dependence for the ordered regime may be indicative of two quantum critical points, a
novel feature not yet observed in Yb compounds.
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