1,575 research outputs found
Gap Symmetry of Superconductivity in UPd2Al3
The angle dependent thermal conductivity of the heavy-fermion superconductor
UPdAl in the vortex state was recently measured by Watanabe et al. Here
we analyze this data from two perspectives: universal heat conduction and the
angle-dependence. We conclude that the superconducting gap function
in UPdAl has horizontal nodes and is given by
, with .Comment: 8 pages, 4 figures, improved figures in replacemen
Bulk superconductivity in Bi4O4S3 revealed by specific heat measurement
Specific heat experiments on a well-characterized polycrystalline sample of
the BiS2 based superconductor Bi4O4S3 revealed that it shows a crear specific
heat anomaly at about Tc = 4.4 K, consistent with Tc from the resistivity and
dc susceptibility. This observation indicates the superconductivity of Bi4O4S3
to be bulk in nature
Gap Symmetry and Thermal Conductivity in Nodal Superconductors
Here we consider the universal heat conduction and the angular dependent
thermal conductivity in the vortex state for a few nodal superconductors. We
present the thermal conductivity as a function of impurity concentration and
the angular dependent thermal conductivity in a few nodal superconductors. This
provides further insight in the gap symmetry of superconductivity in
SrRuO and UPdAl.Comment: 2 pages, proceedings of SCES '0
Anomalous thermopower and Nernst effect in : entropy-current loss in precursor state
The heavy-electron superconductor CeCoIn exhibits a puzzling precursor
state above its superconducting critical temperature at = 2.3 K. The
thermopower and Nernst signal are anomalous. Below 15 K, the entropy current of
the electrons undergoes a steep decrease reaching 0 at .
Concurrently, the off-diagonal thermoelectric current is
enhanced. The delicate sensitivity of the zero-entropy state to field implies
phase coherence over large distances. The prominent anomalies in the
thermoelectric current contrast with the relatively weak effects in the
resistivity and magnetization.Comment: 5 figures, 4 page
Heavy fermion superconductivity in the filled skutterudite compound PrOsSb
The filled skutterudite compound \PrOsSb{} has been found to exhibit
superconductivity with a critical temperature K that
develops out of a heavy Fermi liquid with an effective mass . The current experimental situation regarding the heavy fermion
state, the superconducting state, and a high field, low temperature phase that
is apparently associated with magnetic or quadrupolar order in \PrOsSb{} is
briefly reviewed herein.Comment: 4 pages, 2 figures, presented at the LT23 23rd International
Conference on Low Temperature Physics, Hiroshima, Japa
Magnetic and Electronic Phase Diagram and Superconductivity in the Organic Superconductors k-(BEDT-TTF)2X
The magnetic susceptibility of the organic superconductors -(h8 or
d8-ET), Cu(NCS) and Cu[N(CN)]Br has been studied. A
metallic phase below 37 38 K for Cu[N(CN)]Br and
46 50 K for Cu(NCS) has an anisotropic temperature
dependence of the susceptibility and the charge transport. Partial
charge-density-wave or charge fluctuation is expected to coexist with the
metallic phase instead of the large antiferromagnetic fluctuation above
. The phase diagram and the superconductivity of -(ET)
are discussed in connection with this phase.Comment: 5 pages, 4figures, REVTeX, references are corrected, accepted for
pubication in Phys. Rev.
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