Precise measurements of the magnetic penetration depth are performed at low temperatures and magnetic fields up to 9 Tesla by using a tunnel-diode diode resonator. pico-EMU resolution allows us to study among other effects:
- structure of the superconducting gap
- anisotropy of the superfluid density tensor
- coexistence of superconductivity and magnetism
- surface bound states
- proximity effect
- reversible and irreversible properties in the mixed state