207 research outputs found
Some peculiarities of plasma motions in the earth's magnetosphere
Magnetohydrodynamic flow and eddy currents in earth magnetospher
On the motion of a charged particle in the unidimensional model of magnetosphere's transitional layer
Charged particle motion in unidimensional model of magnetosphere transition laye
Coexistence of Ferromagnetism and Superconductivity in Noncentrosymmetric Materials with Cubic Symmetry
This is a model study for the emergence of superconductivity in
ferromagnetically ordered phases of cubic materials whose crystal structure
lacks inversion symmetry. A Ginzburg-Landau-type theory is used to find the
ferromagnetic state and to determine the coupling of magnetic order to
superconductivity. It is found that noncentrosymmetricity evokes a helical
magnetic phase. If the wavelength of the magnetic order is long enough, it
gives rise to modulations of the order parameter of superconductivity, both in
modulus and complex phase. At magnetic domain walls the nucleation of
superconductivity is found to be suppressed as compared to the interior of
ferromagnetic domains.Comment: 5 pages, 2 figure
Topological states of multiband superconductors with interband pairing
We study the effects of interband pairing in two-band s-wave and d-wave
superconductors with D4h symmetry in both time-reversal invariant as well as
time-reversal symmetry breaking states. The presence of interband pairing
qualitatively changes the nodal structure of the superconductor: nodes can
(dis)appear, merge, and leave high-symmetry locations when interband pairing is
tuned. Furthermore, in the d-wave case, we find that also the boundary modes
change qualitatively when interband pairing increases: flat zero-energy Andreev
bound states gap out and transition to helical edge states.Comment: 19 pages, 11 figure
Classical phase fluctuations in d-wave superconductors
We study the effects of low-energy nodal quasiparticles on the classical
phase fluctuations in a two-dimensional d-wave superconductor. The
singularities of the phase-only action at T\to 0 are removed in the presence of
disorder, which justifies using an extended classical XY-model to describe
phase fluctuations at low temperatures.Comment: 14 pages, brief review for Mod. Phys. Lett.
Probing interfacial pair breaking in tunnel junctions based on the first and the second harmonics of the Josephson current
It will be shown that a pronounced interfacial pair breaking can be
identified in Josephson tunnel junctions provided the first j_{1c} and the
second j_{2c} harmonics of the supercurrent, as well as the depairing current
in the bulk j_{dp}, are known. Namely, within the Ginzburg-Landau theory a
strong interfacial pair breaking results in the relation
j_{2c}j_{dp}>>j_{1c}^2, while in standard junctions, with negligibly small pair
breaking, the relation of opposite character takes place.Comment: 6 pages, published versio
Non-Fraunhofer patterns of the anharmonic Josephson current influenced by a strong interfacial pair breaking
In the junctions with a strong Josephson coupling and a pronounced
interfacial pair breaking, the magnetic interference patterns of the Josephson
current are shown to differ substantially from the standard Fraunhofer shape.
The Fraunhofer pattern occurs, when Josephson couplings are weak. The narrow
peak of the critical current, centered at the zero magnetic field, and the
suppressed hills at finite field values are the characteristic features of the
non-Fraunhofer magnetic field modulation of the critical current, obtained in
this paper.Comment: 5 pages, 4 figure
NMR relaxation rate in non-centrosymmetric superconductors
The spin-lattice relaxation rate of nuclear magnetic resonance in a clean
superconductor without inversion center is calculated for arbitrary pairing
symmetry and band structure, in the presence of strong spin-orbit coupling.Comment: 4 page
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