Speaker
Prof.
Alex Gurevich
(NHMFL, Florida State University)
Description
An overview of recent results on the unusual behavior of
ferropnictide
superconductors under strong magnetic fields is given. The
talk focuses on the extremely high Hc2 values, well above
the BCS paramagnetic limit, anisotropy of vortex properties
and manifestations of the anomalous temperature dependencies
of Hc2(T) along different crystallographic directions,
multiband superconductivity, and the effect of impurity
scattering in different pairing scenarios. The role of
anisotropic vortex fluctuations and their effect on the
resistive transition and the irreversibility field in
pnictides will be addressed. We also discuss our recent
results on the Kondo effect induced by -particle
irradiation of Nd(FeAs))OF single crystals and the resulting
anomalously weak suppression of Tc by magnetic defects
inconsistent with current theoretical models.
Primary author
Prof.
Alex Gurevich
(NHMFL, Florida State University)
