Evidence of photo-induced dynamic competition of metallic and insulating phase in a layered manganite

Yuelin Li, Donald A. Walko, Qing'An Li, Yaohua Liu, Stephan Rosenkranz, Hong Zheng, J. F. Mitchell

Research output: Contribution to journalArticlepeer-review

Abstract

We show evidence that the competition between the antiferromagetic metallic phase and the charge- and orbital-ordered insulating phase at the reentrant phase boundary of a layered manganite, La0.99Sr2.01Mn2O7, can be manipulated using ultrafast optical excitation. The time-dependent evolution of the Jahn-Teller superlattice reflection, which indicates the formation of the charge and orbital order, was measured at different laser fluences. The laser-induced enhancement and reduction the Jahn-Teller reflection intensity shows a reversal of sign between earlier (∼10 ns) and later (∼150 ns) time delays during the relaxation after photo excitation. This effect is consistent with a scenario whereby the laser excitation modulates the local competition between the metallic and the insulating phases.

Original languageEnglish
Article number495602
JournalJournal of Physics Condensed Matter
Volume27
Issue number49
DOIs
StatePublished - Nov 17 2015

Keywords

  • Phase competition by light
  • manganite bilayer
  • ultrafast dynamics in correlated materials

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