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Full-Text Articles in Condensed Matter Physics
A [Mu]+Srstudy Of Uniaxial Stress Induced Symmetry Breaking In An Fe Single Crystal, Min. Namkung
A [Mu]+Srstudy Of Uniaxial Stress Induced Symmetry Breaking In An Fe Single Crystal, Min. Namkung
Dissertations, Theses, and Masters Projects
For the first time, external uniaxial stress has been used in a (mu)('+)SR experiment. The stress dependences of the following parameters were obtained for Fe crystals: the muon precessional frequency, (nu)(,(mu)), the transverse (longitudinal) depolarization rates, 1/T(,2) (1/T(,1)), and F(,T)/F(,L), the ratio of the probabilities for the muon to find domains with transverse/longitudinal fields. The shift in (nu)(,(mu)) was -0.34 (+OR-) 0.023 MHz per 100 micro-strain along the -axis. Changes in other parameters depend on the sample history but they, in general, increase with stress.;External stress changes the muon occupational probability at each site which significantly affects the dipolar field …
Diffusion And Trapping Of Positive Muons In Niobium And In Aluminum Alloys, Muhammad Zillulhaq Numan
Diffusion And Trapping Of Positive Muons In Niobium And In Aluminum Alloys, Muhammad Zillulhaq Numan
Dissertations, Theses, and Masters Projects
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 …