The structure of magnetic vortices in lithium ion batteries
Absence of hexagonal to square structural transition in LiFeAs vortex matter
Magnetic vortices in two stoichiometric stoichiometric lifeas samples were investigated by means of scanning tunneling microscopy and spectroscopy.
The vortices were revealed by measuring the local electronic density of states (ldos) at zerobias conductance of samples in magnetic fields between 0.5 and 12 t. however, in contrast to previous reports, our study reveals that the reported hexagonal to square-like vortex lattice transition is absent up to 12 t both in field-cooling and zero-field-cooling processes.
Remarkably, a highly ordered zero field cooled hexagonal vortex lattice is observed up to 8 t. from single vortex spectroscopy we extract the ginzburg-landau coherence length of both samples as nm and nm, in accordance with previousfindings.
Sven Hoffmann, Ronny Schlegel, Christian Salazar, Steffen Sykora, Pranab Kumar Nag, Pavlo Khanenko, Robert Beck, Saicharan Aswartham, Sabine Wurmehl, Bernd Büchner, Yanina Fasano, Christian Hess