Phase shift effects on the second moment and skewness of the field profiles obtained by the muon spin relaxation technique

Abstract

Recent high transverse field muon spin relaxation (TF-uSR) experiments performed on Bi2212 single crystals show that the phase parameter extracted from individual histogram, an indication of the angle between the muon's initial polarization direction and the detector direction, is temperature dependent. This phase shift effect, probably due to the electronic or initial polarization instability at a time interval comparable with the muon spin precession period, will affect the second moment and skewness of the field profiles. The proper data analysis procedure is discussed to correct this phase shift effect, which is important on the quantitative interpretation of the first order transition or melting transition in the Bi2212 mixed state.