The London penetration depth in 110 K-phase of lead-free Bi-Sr-Ca-Cu-O measured by muon spin rotation technique

The muon depolarization rate σ was measured by Transverse Field μSR and field cooling procedure in an applied magnetic field of 200 mT. By assumption that the muon depolarization rate σ in the 80 K- phase in normal state is small, data from the temperature interval 85–100 K were used to estimate the magnetic field penetration depth in the 110 K- phase of the lead-free ceramic Bi-Sr-Ca-Cu-O superconductor.