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Scientific article
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Ultrafast activation of the double-exchange interaction in antiferromagnetic manganites

Published inAPL materials, vol. 11, no. 7, 071107
Publication date2023-07-01
First online date2023-07-07
Abstract

In doped manganite systems, strong electronic correlations result in rich phase diagrams where electron delocalization strongly affects the magnetic order. Here, we employ a femtosecond all-optical pump-probe scheme to impulsively photodope the antiferromagnetic parent manganite system CaMnO3 and unveil the formation dynamics of a long-range ferromagnetic state. We resonantly target intense charge transfer electronic transitions in CaMnO3 to photodope the system and probe the subsequent dynamics of both charges and spins using a unique combination of time-resolved terahertz spectroscopy and time-resolved magneto-optical Faraday measurements. We demonstrate that photodoping promotes a long-lived population of delocalized electrons and induces a net magnetization, effectively promoting ferromagnetism resulting from light-induced carrier-mediated short-range double-exchange interactions. The picosecond set time of the magnetization, much longer than the electron timescale, and the presence of an excitation threshold are consistent with the formation of ferromagnetic patches in an antiferromagnetic background.

eng
Research group
Funding
  • European Commission - Emerging electronic states and devices based on Mott insulator interfaces [615759]
  • European Commission - Designer Quantum Materials Out of Equilibrium [677458]
Citation (ISO format)
HORTENSIUS, J. R. et al. Ultrafast activation of the double-exchange interaction in antiferromagnetic manganites. In: APL materials, 2023, vol. 11, n° 7, p. 071107. doi: 10.1063/5.0156400
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ISSN of the journal2166-532X
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