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Josephson vortices and solitons inside pancake vortex lattice in layered superconductors A. E. Koshelev
 

Summary: Josephson vortices and solitons inside pancake vortex lattice in layered superconductors
A. E. Koshelev
Materials Science Division, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439, USA
Received 9 May 2003; published 29 September 2003
In very anisotropic layered superconductors a tilted magnetic field generates crossing vortex lattices of
pancake and Josephson vortices JV's . We study the properties of an isolated JV in the lattice of pancake
vortices. JV induces deformations in the pancake vortex crystal, which, in turn, substantially modify the JV
structure. The phase field of the JV is composed of two types of phase deformations: the regular phase and
vortex phase. The phase deformations with smaller stiffness dominate. The contribution from the vortex phase
smoothly takes over with increasing magnetic field. We find that the structure of the cores experiences a
smooth yet qualitative evolution with decrease of the anisotropy. At large anisotropies pancakes have only
small deformations with respect to position of the ideal crystal, while at smaller anisotropies the pancake stacks
in the central row smoothly transfer between the neighboring lattice positions forming a solitonlike structure.
We also find that even at high anisotropies pancake vortices strongly pin JV's and strongly increase their
viscous friction.
DOI: 10.1103/PhysRevB.68.094520 PACS number s : 74.25.Qt, 74.20.De
I. INTRODUCTION
The vortex state in layered superconductors has a very
rich phase diagram in the multidimensional space of
temperature-field­anisotropy-field orientation. Especially in-

  

Source: Alexei, Koshelev - Materials Science Division, Argonne National Laboratory

 

Collections: Materials Science; Physics