Evidence for a phase-transition-induced change in the surface spin-flip probability of conduction electrons from CESR on n-irradiated, LIF; its application as an intensity reference

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Abstract
In view of its application as an intensity marker in electron spin resonance, the conduction electron spin resonance signal of Li particles in neutron-irradiated LiF has been analysed regarding its lineshape, linewidth, intensity and spectral composition in the temperature range 4.2pp approximately=0.065 mT; the linewidth, as expected, is found to be dominated by electron-surface scattering. Double numerical integration of the absorption-derivative dPmu a/dB spectra shows the number of spins to be T-independent, as expected from a Pauli-paramagnetic behaviour. Data analysis reveals that, as T decreases, the single Lorentzian line observed at 300 K gradually evolves more and more to a sum of Lorentz lines (likely 2) of all identical g but of different widths 0.065pppp2Y'm method (Y'm being the signal amplitude) of the double integration method to the signal intensity from the dPmu a/dB spectra. The effect arises from a change upon cooling of the spin-flip probability epsilon Li for scattering of conduction electrons at a non-magnetic interface, i.e., Li metal-surrounding; this is tentatively ascribed to the martensitic phase transition in Li.