ISSN:
1572-9540
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Abstract We have studied Al(Cu), Al(Mg) and Al(Ag) alloys to determine the μ+ trapping sites, and how impurity distortions affect these sites. Cu (Monovalent) contracts the Al lattice, Mg (divalent) expands it, and Ag (monovalent) has almost no effect. Fitting to a two-state model we obtained a temperature exponent β of 0.93 (26 for zero field and 1.16(14) for a longitudinal, field where β=1 implies a one-phonon induced diffusion process. The measured secon moment in Al(Mg) indicates a changing trapping site, which was confirmed by zero and longitudinal field studies. Comparing the Al(Mg) results with earlier Al(Cu) data, two types of sites can be identified: those which are distant from the defect and depend on the magnitude but not the sign of the deformation, and those close to Mg. Ag produces no lattice distortion, and its weaker depolarization suggests a different trapping mechanism.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF02401561
