Iron-based superconductors
Why does high-temperature superconductivity occur in these fascinating materials,
and is it related to fluctuations of the electron spin in the 5 Fe d-orbitals near
the Fermi level?
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Disorder in unconventional
superconductors
Left: scanning tunneling microscope image showing
"native defects" on the
surface of a high-Tc cuprate superconductor. [Hudson et al.,
1999]. What can we learn from spectroscopic probes about the interplay
of disorder and strong electronic correlations?
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Nonequilibrium
superconductivity
What happens when many high-energy quasiparticles are created by a pulse
of light?
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Quasiparticles in the vortex state
Left: STM image of the vortex state of NbSe2
[Upward et al, Delft]. How does energy propagate in the vortex
lattice state? What are the main sources of
quasiparticle scattering?
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Nanoscale superconductivity
Right: artificial grain boundary between two
YBCO crystallites [Mannhart group 2003].
How is unconventional
pairing in small grains, quantum wires and at interfaces different?
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