μSR study of Al-0.67%Mg-0.77%Si alloys

13th International Conference on Muon Spin Rotation, Relaxation and Resonance

Nishimura, K.^1 ; Matsuda, K.^1 ; Komaki, R.^1 ; Nunomura, N.^2 ; Wenner, S.^3 ; Holmestad, R.^3 ; Matsuzaki, T.^4 ; Watanabe, I.^4 ; Pratt, F.L.^5 ; Marioara, C.D.^6

Faculty of Engineering, University of Toyama, Toyama, Japan^1

Information Technology Center, University of Toyama, Toyama

930-8555, Japan^2

Department of Physics, NTNU, Hogskoleringen 5, Trondheim

NO-7491, Norway^3

Advanced Meson Science Laboratory, RIKEN Nishina Center for Accelerator Based Science, RIKEN, Wako

351-0198, Japan^4

ISIS Facility, Rutherford Appleton Laboratory, Chilton

OX11 0QX, United Kingdom^5

Materials and Chemistry, SINTEF, Trondheim

NO-7491, Norway^6

关键词: Effect of heat treatments;    Fitting parameters;    Low temperature regions;    Muon-spin-relaxation measurements;    Relaxation functions;    Relaxation spectrum;    Temperature variation;    Three temperature;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/551/1/012031/pdf
DOI  :  10.1088/1742-6596/551/1/012031

来源: IOP

【 摘 要 】

Zero-field muon spin relaxation measurements were carried out with Al-0.67%Mg- 0.77%Si alloys in the temperature range from 20 K to 300 K. Observed relaxation spectra were compared with the relaxation functions calculated by a Monte Carlo simulation with four fitting parameters: the dipolar width, trapping rate, detrapping rate and fraction of initially trapped muons. From the fitting, the temperature variations of the trapping rates reveal that there are three temperature regions concerning muon kinetics. In the low temperature region below 120 K, muons appeared to be trapped in a shallow potential yielded by dissolved Mg atoms, and thus little effect of heat treatment of the samples was observed, while in the mid and high temperature regions, the trapping rates clearly depended on the heat treatment of the samples suggesting muon-cluster and/or muon-vacancy interactions.