Europhys. Lett.
Volume 75, Number 6, September 2006
Page(s) 936 - 942
Section Condensed matter: electronic structure, electrical, magnetic, and optical properties
Published online 09 August 2006
Europhys. Lett., 75 (6), pp. 936-942 (2006)
DOI: 10.1209/epl/i2006-10195-4

Vortex states inside the superconducting phase of a thin microtriangle

C. Carballeira1, 2, G. Teniers1, V. V. Moshchalkov1, L. F. Chibotaru3 and A. Ceulemans3

1  INPAC-Institute for Nanoscale Physics and Chemistry, KU Leuven Nanoscale Superconductivity and Magnetism Group Celestijnenlaan 200 D, 3001 Leuven, Belgium
2  Laboratorio de Baixas Temperaturas e Superconductividade Departamento de Física da Materia Condensada, Universidade de Santiago de Compostela - 15782 Santiago de Compostela, Spain
3  INPAC-Institute for Nanoscale Physics and Chemistry, KU Leuven Quantum Chemistry Group - Celestijnenlaan 200 F, 3001 Leuven, Belgium

received 12 May 2006; accepted 20 July 2006
published online 9 August 2006

By combining the non-linear Ginzburg-Landau equations with a gauge transformation of the vector potential that accounts for the superconducting/vacuum boundary condition, the superconducting phase of a thin microtriangle under a perpendicular magnetic field is investigated. We determine the symmetry-breaking and symmetry-switching transitions that the nucleated order parameter may undergo when decreasing the temperature well below the phase boundary. It is shown that symmetry consistent vortex-antivortex patterns are stable in a broad range of temperatures and magnetic fields. The geometry of the sample also induces crossovers between vortex states unexpected for other regular polygons.

74.20.De - Phenomenological theories (two fluid, Ginzburg-Landau, etc.).
74.78.Na - Mesoscopic and nanoscale systems.
74.25.Ha - Magnetic properties.

© EDP Sciences 2006