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Redfield¶
Description¶
The Redfield formula for the Longitudinal Field (LF) dependence of the muon spin relaxation rate, \(\Lambda\), given in units of \(\mu s^{-1}\), with the applied longitudinal magnetic field, for given local magnetic field (\(H_\text{loc}\)) and correlation time of fluctuations at muon spin sites (\(\tau\)) is:
where,
\(H_\text{loc}\) is the local magnetic field, in Gauss,
\(H_\text{LF}\) is the applied longitudinal magnetic field, in Gauss,
\(\tau\) is the muon spin correlation time, in microseconds, with expression given as \(\tau = \frac{1}{f}\) where \(f\) is the frequency of fluctuation at muon sites.
And \(\gamma_\mu\) is the gyromagnetic ratio of the muon spin, given in units of \([rad]x\frac{MHz}{Gauss}\)
(Source code, png, hires.png, pdf)
Properties (fitting parameters)¶
Name |
Default |
Description |
|---|---|---|
Hloc |
0.1 |
Local magnetic field (G) |
Tau |
0.1 |
Correlation time of muon spins (microsec) |
References¶
[1] Takao Suzuki et al, J. Phys.: Conf. Ser. 502 012041 (2014).
Categories: FitFunctions | Muon\MuonModelling
Source¶
Python: Redfield.py