Nucleation of superconductivity in a thin disk with a ring-like defect

Barba-Ortega, J.Sardella, Edson [UNESP]Aguiar, J. Albino2014-05-272014-05-272013-02-10Modern Physics Letters B, v. 27, n. 4, 2013.0217-9849http://hdl.handle.net/11449/74575We report on the influence of a circular defect on the vortex configuration in a mesoscopic superconducting sample. Effects associated with the pinning force of the circular defect on the configuration and on the vortex entry fields are studied for a very thin disk. We calculate the magnetization loop, vorticity, free energy and superconducting electrons for the disk in presence of an external magnetic field applied perpendicular to the disk plane. The magnetization curves are hysteretic, with paramagnetic response in part of the downward branch, also, in this part we found a vortex-anti-vortex state. © 2013 World Scientific Publishing Company.engGinzburg-LandauMesoscopicsRing defectSuperconductingNucleation of superconductivity in a thin disk with a ring-like defectArtigo10.1142/S0217984913500255WOS:000316901300003Acesso restrito2-s2.0-8487269626777992536461198890000-0001-7041-81360000-0001-7041-8136