Redfield

Description

The Redfield formula for the Longitudinal Field (LF) dependence of the muon spin relaxation rate, Λ, given in units of μs1, with the applied longitudinal magnetic field, for given local magnetic field (Hloc) and correlation time of fluctuations at muon spin sites (τ) is:

Λ(t)=2γμ2Hloc2τ1+γμ2HLF2τ2

where,

Hloc is the local magnetic field, in Gauss,

HLF is the applied longitudinal magnetic field, in Gauss,

τ is the muon spin correlation time, in microseconds, with expression given as τ=1f where f is the frequency of fluctuation at muon sites.

And γμ is the gyromagnetic ratio of the muon spin, given in units of [rad]xMHzGauss

(Source code, png, hires.png, pdf)

../../_images/Redfield-1.png

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