13,261 research outputs found
Gap Symmetry an Thermal Conductivity in Nodal Superconductors
There are now many nodal superconductors in heavy fermion (HF) systems,
charge conjugated organic metals, high Tc cuprates and ruthenates. On the other
hand only few of them have a well established gap function. We present here a
study of the angular dependent thermal conductivity in the vortex state of some
of the nodal superconductors. We hope it will help to identify the nodal
directions in the gap function of UPd_2Al_3, UNi_2Al_3, UBe_13 and URu_2Si_2.Comment: 4 pages, 5 figure
Nonlinear response and scaling law in the vortex state of d-wave superconductors
We study the field dependence of the quasi-particle density of states, the
thermodynamics and the transport properties in the vortex state of d-wave
superconductors when a magnetic field is applied perpendicular to the
conducting plane, specially for the low field and the low temperature compared
to the upper critical field and transition temperature, respectively, and . Both the superfluid density and the spin
susceptibility exhibit the characteristic -field dependence, while
the nuclear spin lattice relaxation rate T and the thermal
conductivity are linear in field . With increasing temperature, these
quantities exhibit the scaling behavior in . The present theory
applies to 2D -wave superconductor as well; a possible candidate of the
superconductivity in SrRuO.Comment: 11 pages, 4 figure
Fulde-Ferrell-Larkin-Ovchinnikov state in d-wave superconductors
The Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) state can be found in layered
d-wave superconductors such as high cuprates and -(ET) salts
in a planar magnetic field. We show the superconducting order parameter forms
two dimensional crystalline lattice in the FFLO state for d-wave
superconductors. Also the quasiparticle density of states and the
thermodynamics of FFLO state are constructed. Therefore STM or NMR will provide
a definitive test for the existence of the FFLO state.Comment: 5 pages including 2 figure
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
Thermal Conductivity in Vortex State of Nodal Superconductors
How to determine the symmetry of the superconducting order parameter is one
of the important issues in novel superconductors, which include charge
conjugated organic superconductors. We have proposed that the angular
dependence of the thermal conductivity in a planar magnetic field provides a
new window to look at the symmetry of the order parameter. After a brief
summary of the quasiclassical approach we describe how the symmetry of the
superconducting order parameter in SrRuO, CeCoIn and
-(ET)Cu(NCS) is determined. Also in some of experiments the
phononic thermal conductivity plays the crucial role.Comment: 5 pages, 3 figures. to be published in Synthetic Metal
Critical Current of the Spin-Triplet Superconducting Phase in SrRuO
There have been two different proposals for the spin-triplet order parameter
of the superconducting phase in SrRuO; an -wave order parameter and
the multigap model where some of the bands have the line node. In an effort to
propose an experiment that can distinguish two cases, we study the behavior of
the supercurrent and compute the critical current for these order parameters
when the sample is a thin film with the thickness where is
the coherence length. It is found that the supercurrent behaves very
differently in two models. This will serve as a sharp test for the
identification of the correct order parameter.Comment: 4 pages, 1 figur
Possible f-wave superconductivity in SrRuO?
Until recently it has been believed that the superconductivity in
SrRuO is described by p-wave pairing. However, both the recent specific
heat and the magnetic penetration depth measurements on the purest single
crystals of SrRuO appear to be explained more consistently in terms of
f-wave superconductivity. In order to further this hypothesis, we study
theoretically the thermodynamics and thermal conductivity of f-wave
superconductors in a planar magnetic field. We find the simple expressions for
these quantities when and , which should be
readily accessible experimentally.Comment: 6 pages, 2 figure
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