Workshop "NMR, µSR, Mössbauer spectroscopies in the study of Fe-based and other unconventional high-Tc superconductors"
Phenomenological behaviour of the magnetic penetration depth in 1111: a muon spin rotation study
Samuele Sanna, Universitá degli Studi di Pavia, Italy
The magnetic penetration depth, λL, is one of the most important length scales in superconductors. Its temperature evolution is a sensitive probe of the superconducting gap structure and its value is related to the superfluid density, which is sensitive to the pairing mechanism as well as to the relation between superconductivity and adjacent phase. Here I present the phenomenological behaviour of λL for 1111 oxy-pnictide compounds as a function of doping, impurity and pressure, as measured by muon spin rotation measurements. The results will be compared to the behaviour expected within different theoretical approaches: multiband BCS, phase fluctuations around a quantum critical point, coexistence of magnetism and superconductivity.