Experimental investigation of the coupling between magnetic and superconducting order parameters in LSCO thin films

by Dr Meni Shay (Technion, Haifa, Israel)

Monday 30 Jun 2008, 15:00 → 17:00 Europe/Rome

Aula 5 (Dip. di Fisica - Edificio E. Fermi)

We investigate the coupling between the magnetic and superconducting order parameters in an 8 m long meander wire made of a LSCO thin film. The magnetic order parameter is determined by the new Low-Energy muon spin relaxation technique. The superconducting order parameter is characterized by transport measurements and modified by high current density. The magnetic-superconducting phase, known from bulk samples, is also found in this clean film. We place a surprisingly small upper limit on the coupling between the two order parameters. This suggests that the transition from a magnetic to superconducting state as a function of doping is better described by a second order phase transition with coexistence of both phases distributed homogeneously over the sample. Also we find that the magnetic order does not trap flux and does not change the value of the critical current.