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note
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In our case no pump laser saturates the absorption, but a faster second relaxation channel becomes effective.
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22
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33646630201
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note
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0 which indicates a small internal dipolar field λM ≈ 0.04-0.05 T; we have included it in our calculations.
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23
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33646624683
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note
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At low temperatures, we observe a much faster relaxation as compared to previous data (Refs. 2,5), because in polycrystalline samples a noticeable transverse component of the magnetic field leads to an increase of the tunneling splitting, and relaxation rate. At higher temperatures the tunneling occurs via excited states with a higher initial tunneling splitting and the effect of the transverse magnetic field diminishes; hence the different data coverge.
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33646631934
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note
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12ac samples (Refs. 25,26).
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