Interaction of vortices in superconductors with κ close to 1/(2)
Abstract
Using a perturbative approach to the infinitely degenerate Bogomolnyi vortex state for a superconductor with κ=1/(2),T>T_{c}, we calculate the interaction of vortices in a superconductor with κ close to 1/(2). We find, numerically and analytically, that depending on the material the interaction potential between the vortices varies with decreasing κ from purely repulsive (as in a typeII superconductor) to purely attractive (as in a typeI superconductor) in two different ways: either vortices form a bound state and the distance between them changes gradually from infinity to zero or this transition occurs in a discontinuous way as a result of a competition between minima at infinity and zero. We study the discontinuous transition between the vortex and Meissner states caused by the nonmonotonous vortex interaction and calculate the corresponding magnetization jump.
 Publication:

Physical Review B
 Pub Date:
 June 2002
 DOI:
 10.1103/PhysRevB.65.224504
 arXiv:
 arXiv:condmat/0201499
 Bibcode:
 2002PhRvB..65v4504M
 Keywords:

 74.60.Ec;
 74.20.De;
 74.55.+h;
 Phenomenological theories;
 Condensed Matter  Superconductivity
 EPrint:
 v1:original submit v2:changed formate of images (gave problems to some) v3:corrected fig v4v6 (was v4v6) orthographic corrections (and U_lat/int) mismatch v4:more small orthographic corrections v5:converted to revtex4 and bibTex v6:Renamed images to submit to prb