Transient quantum isolation and critical behavior in the magnetization dynamics of half-metallic manganites

Abstract

We combine time resolved pump-probe Magneto-Optical Kerr Effect and Photoelectron Spectroscopy experiments supported by theoretical analysis to determine the relaxation dynamics of delocalized electrons in half-metallic ferromagnetic manganite $L{a}_{1-x}S{r}_{x}Mn{O}_3$. We observe that the half-metallic character of $L{a}_{1-x}S{r}_{x}Mn{O}_3$ determines the timescale of both the electronic phase transition and the quenching of magnetization, revealing a quantum isolation of the spin system in double exchange ferromagnets extending up to hundreds of picoseconds. We demonstrate the use of time-resolved hard X-ray photoelectron spectroscopy (TR-HAXPES) as a unique tool to single out the evolution of strongly correlated electronic states across a second-order phase transition in a complex material.

Article 25 pages, 6 figures

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