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Related Experiment Video

Updated: Feb 27, 2026

Measurement of Coherence Decay in GaMnAs Using Femtosecond Four-wave Mixing
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Nonlinear Electron-Phonon Coupling in Doped Manganites.

V Esposito1, M Fechner2,3, R Mankowsky2,4

  • 1Swiss Light Source, Paul Scherrer Institut, 5232 Villigen PSI, Switzerland.

Physical Review Letters
|July 1, 2017
PubMed
Summary

We observed that exciting a lattice mode in Pr_{0.5}Ca_{0.5}MnO_{3} rapidly melts charge order and causes an insulator-to-metal transition. This nonlinear effect is driven by anharmonic coupling, opening new possibilities for phonon control.

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Radio Frequency Magnetron Sputtering of GdBa2Cu3O7âˆ'ÃŽ ´/ La0.67Sr0.33MnO3 Quasi-bilayer Films on SrTiO3 STO Single-crystal Substrates

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Radio Frequency Magnetron Sputtering of GdBa2Cu3O7âˆ'ÃŽ ´/ La0.67Sr0.33MnO3 Quasi-bilayer Films on SrTiO3 STO Single-crystal Substrates

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Solid-State Chemistry

Background:

  • Doped manganites exhibit complex phase transitions, including charge order and insulator-to-metal transitions.
  • Understanding the dynamics of these transitions is crucial for materials design and device applications.

Purpose of the Study:

  • To investigate the melting of charge order and insulator-to-metal transition in Pr_{0.5}Ca_{0.5}MnO_{3} using time-resolved resonant x-ray diffraction.
  • To explore the role of lattice dynamics in driving these electronic phase transitions.

Main Methods:

  • Time-resolved resonant x-ray diffraction was employed to probe structural and electronic changes.
  • High-frequency infrared-active lattice modes were resonantly excited.
  • Density-functional theory calculations were performed to elucidate the underlying mechanisms.

Main Results:

  • Charge order was found to melt promptly and nonlinearly with increasing excitation fluence.
  • The insulator-to-metal transition was observed to be closely linked to the melting of charge order.
  • Anharmonic coupling between the excited lattice mode and electronic structure was identified as the driving mechanism.

Conclusions:

  • Resonant excitation of lattice modes offers a pathway to control charge order and electronic phases in materials.
  • Nonlinear phonon dynamics play a significant role in ultrafast phase transitions.
  • This work highlights a novel approach for manipulating material properties through lattice vibrations.