Diffusion and trapping of positive muons in niobium and in aluminum alloys

• Main Author: Numan, Muhammad Zillulhaq
• Format: Others
• Language: English
• Published: W&M ScholarWorks 1982
• Subjects: Condensed Matter Physics
• Online Access: https://scholarworks.wm.edu/etd/1539623730; https://scholarworks.wm.edu/cgi/viewcontent.cgi?article=3591&context=etd

Zero, longitudinal and transverse magnetic field uSR has been used to investigate (mu)('+) diffusion and trapping in Nb. The ambiguity in the interpretation of the 'double humped' temperature dependence of the depolarisation rate for the transverse field case has been resolved. A discussion of how the zero and longitudinal measurements can distinguish between the trapping and detrapping phenomena is presented with (mu)SR data analysis in mind. Muon mobility is shown to increase monotonically with temperature. The width of the local magnetic field distribution due to Nb nuclear moments and the rate for trapping and detrapping of muons have been measured at several temperatures.;Data from an earlier study of aluminum doped with .1 at. % Si, Ag and Mg showing complex structure in the linewidth parameter have been analyzed further using a multi-trap nonequilibrium model to obtain trap concentration, binding energies and diffusion rates for the host and the traps.