INVESTIGADORES
FASANO Yanina
congresos y reuniones científicas
Título:
Direct imaging of vortex matter in iron-selenide superconductors
Autor/es:
L. AMIGÓ; R. CORTÉS MALDONADO; G. NIEVA; Y. FASANO
Lugar:
Natal
Reunión:
Workshop; Poster invitado en el 16th International Workshop on Vortex Matter in SuperconducPo; 2017
Institución organizadora:
International Institute of Physics, Natal
Resumen:
We study the structural properties of vortex matter in single crystals of $\beta$-FeSe and FeSe$_{0.95}$S$_{0.05}$ by means of the Bitter decoration technique. We are able to image individual vortex positions only up to 5\,Oe. At larger fields the gradient of the local magnetic induction associated to each vortex decreases and we loose single-vortex resolution. All samples present lines with higher vortex density that we associate to twin-boundaries between crystallographic orthorhombic domains with different orientations. The observed vortex structure presents distorted hexagonal symmetry and local regions with square-like symmetry. We discuss on the origin of this unconventional vortex lattice.
