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 La1−xSrxMnO3. We observe that the half-metallic character of La1−xSrxMnO3 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{arxiv.1906.00257,
title = {Transient quantum isolation and critical behavior in the magnetization dynamics of half-metallic manganites},
author = {Tommaso Pincelli and Riccardo Cucini and Adriano Verna and Francesco Borgatti and Masaki Oura and Kenji Tamasaku and Tien-lin Lee and Christoph Schlueter and Stefan Günther and Christian Horst Back and Martina Dell'Angela and Roberta Ciprian and Pasquale Orgiani and Aleksandr Petrov and Fausto Sirotti and Valentin Dediu and Ilaria Bergenti and Patrizio Graziosi and Fabio Miletto Granozio and Yoshihito Tanaka and Munetaka Taguchi and Hiroshi Daimon and Jun Fujii and Giorgio Rossi and Giancarlo Panaccione},
journal= {arXiv preprint arXiv:1906.00257},
year = {2019}
}