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A time-resolved optical study of the paramagnetic dielectric-ferromagnetic metal transition in La0.7Ca0.3MnO3

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JETP_misochko_2003.pdf
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2003

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Misochko, Oleg Victor
Kaidashev, E. M.
Georgiev, Nikolai
Zakharchenko, Irina N.

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Journal of experimental and theoretical physics. 2003, 97(4), pp. 788-793. Available under: doi: 10.1134/1.1625069

Zusammenfassung

The relaxation dynamics of charge carriers in an epitaxial La0.7Ca0.3MnO3 film was studied by the light reflection method with a femtosecond time resolution in a wide temperature range. The relaxation of time-resolved photoinduced reflections was shown to be two-component in the whole temperature range including the paramagnetic dielectric-ferromagnetic metal transition at T ≈ 150 160 K. The fast relaxation component had a maximum lifetime (τ ~ 500 ps) in the transition region, and its contribution to relaxation increased as temperature decreased. The lifetime of the slow component was minimum (τ ~ 15 fs) in the transition region. In addition, fast oscillations assigned to coherent phonons appeared in photoinduced responses at T < 200 K. The dephasing time of these oscillations increased as temperature decreased, whereas their frequency changed insignificantly.

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530 Physik

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ISO 690MISOCHKO, Oleg Victor, E. M. KAIDASHEV, Nikolai GEORGIEV, Thomas DEKORSY, Irina N. ZAKHARCHENKO, 2003. A time-resolved optical study of the paramagnetic dielectric-ferromagnetic metal transition in La0.7Ca0.3MnO3. In: Journal of experimental and theoretical physics. 2003, 97(4), pp. 788-793. Available under: doi: 10.1134/1.1625069
BibTex
@article{Misochko2003timer-9045,
  year={2003},
  doi={10.1134/1.1625069},
  title={A time-resolved optical study of the paramagnetic dielectric-ferromagnetic metal transition in La0.7Ca0.3MnO3},
  number={4},
  volume={97},
  journal={Journal of experimental and theoretical physics},
  pages={788--793},
  author={Misochko, Oleg Victor and Kaidashev, E. M. and Georgiev, Nikolai and Dekorsy, Thomas and Zakharchenko, Irina N.}
}
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