Methods of determining the magnetic penetration depth of high-κ superconductors fromμ + SR measurementsSR measurements

This paper explores several different methods of determining the magnetic penetration depth of high-κ superconductors from transverse field muon spin rotation (TFμ ⁺ SR) measurements. The methods include fitting the theoretical magnetic field distribution directly to the distribution of muon precession frequencies and calculating the penetration depth from the second or third moments of the field distribution. These three methods are discussed critically in the light of experimental noise and the effect of the superconductor's flux line lattice being distorted.