Journal
PHYSICAL REVIEW LETTERS
Volume 123, Issue 26, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.123.267201
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Funding
- Office of Naval Research [N00014-12-1-0530, N00014-16-1-2090]
- National Science Foundation [CHE-1111557, CHE-1665383]
- Samsung GRO program
- DOE-Basic Energy Sciences [DE-SC0012375]
- NSF of China [11974326, 11804342]
- National key R&D Program of China [2016YFA0401003]
- Hefei Science Center CAS
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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 La0.67Ca0.33 MnO3, optical excitation with a sub-l00-fs pulse above 2 mJ/cm(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.
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