A substantial fraction of the μSR asymmetry originates from muons stopping in the pressure cell surrounding the sample (35). Therefore, the μSR data in the whole temperature range were analyzed by decomposing the signal into a contribution of the sample and a contribution of the pressure cell. In addition, the TF-μSR spectra were fitted in the time domain with a combination of a slowly relaxing signal with a precession frequency corresponding to the applied field of μ0H = 5 mT (due to muons in a paramagnetic environment) and a fast relaxing signal due to muons precessing in much larger static local fields:Embedded Image(2)where A0 is the initial asymmetry, that is, the amplitude of the oscillation in the fully paramagnetic state. P(t) is the muon spin-polarization function, and γμ/(2π) ≃ 135.5 MHz/T is the muon gyromagnetic ratio. APC and λPC are the asymmetry and the relaxation rate of the pressure cell signal. Embedded Image and Embedded Image are the amplitudes of the slow (paramagnetic) and fast relaxing sample signals, respectively. λ′ is the relaxation rate of the paramagnetic part of the sample, caused by the paramagnetic spin fluctuations and/or nuclear dipolar moments. Embedded Image and Embedded Image are the transverse and longitudinal relaxation rates, respectively, of the magnetic part of the sample. B′ and B″ are the magnetic fields, probed by the muons stopped in the paramagnetic and magnetic parts of the sample, respectively. From these refinements, the paramagnetic fraction at each temperature T was estimated as Vosc = 1 − Embedded Image(T)/AS(0).

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