Dynamics of a Persistent Insulator-to-Metal Transition in Strained Manganite Films
Author(s)Teitelbaum, Samuel Welch; Ofori-Okai, Benjamin Kwasi; Cheng, Yu-Hsiang; Zhang, Jingdi; Jin, Feng; Wu, Wenbin; Averitt, Richard D.; Nelson, Keith Adam; ... Show more Show less
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Transition metal oxides possess complex free-energy surfaces with competing degrees of freedom. Photoexcitation allows shaping of such rich energy landscapes. In epitaxially strained La[subscript 0.67]Ca[subscript 0.33]MnO[subscript 3], optical excitation with a sub-100-fs pulse above 2 mJ/cm[superscript 2] leads to a persistent metallic phase below 100 K. Using single-shot optical and terahertz spectroscopy, we show that this phase transition is a multistep process. We conclude that the phase transition is driven by partial charge-order melting, followed by growth of the persistent metallic phase on longer timescales. A time-dependent Ginzburg-Landau model can describe the fast dynamics of the reflectivity, followed by longer timescale in-growth of the metallic phase.
DepartmentMassachusetts Institute of Technology. Department of Chemistry; Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science
Physical Review Letters
American Physical Society (APS)
Teitelbaum, Samuel W. et al. "Dynamics of a Persistent Insulator-to-Metal Transition in Strained Manganite Films." Physical Review Letters 123, 26 (December 2019): 267201 © 2019 American Physical Society.
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