Ultrafast polaron dynamics in La 0.7 Ca 0.3 MnO 3 thin films

Kaung-Hsiung Wu; T. I. Hsu; I. J. Chen; H. C. Shih; Chih-Wei Luo; T. M. Uen; Jiunn-Yuan Lin; Jenh-Yih Juang; T. Kobayashi

doi:10.1088/1742-6596/150/4/042230

Ultrafast polaron dynamics in La _0.7 Ca _0.3 MnO ₃ thin films

Kaung-Hsiung Wu, T. I. Hsu, I. J. Chen, H. C. Shih, Chih-Wei Luo, T. M. Uen, Jiunn-Yuan Lin, Jenh-Yih Juang, T. Kobayashi

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Abstract

In this work, we use ultrafast optical pump-optical probe (OPOP) spectroscopy to probe the polaron dynamics in La _0.7 Ca _0.3 MnO ₃ (LCMO) thin films. The temporal evolution in transient reflectivity change δR/R exhibits two relaxing components: a fast component with a time constant of subpicosecond and a slow component with time constant ranging from tens of ps to hundreds of ps. The amplitude of the fast component exhibits the similar temperature depence with that of the resistivity, and the neutron scattering intensity due to nanoscale correlated polarons. The results strongly suggest that the fast photoinduced reflectivity change may have been due to the photoexcitation and trapping process of correlated Jahn-Teller (T-J) polarons in the paramagnetic (PM) and ferromagnetic (FM) phases.

Original language	American English
Article number	042230
Pages (from-to)	1-4
Number of pages	4
Journal	Journal of Physics: Conference Series
Volume	150
Issue number	4
DOIs	https://doi.org/10.1088/1742-6596/150/4/042230
State	Published - 6 Aug 2008

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title = "Ultrafast polaron dynamics in La 0.7 Ca 0.3 MnO 3 thin films",

abstract = " In this work, we use ultrafast optical pump-optical probe (OPOP) spectroscopy to probe the polaron dynamics in La 0.7 Ca 0.3 MnO 3 (LCMO) thin films. The temporal evolution in transient reflectivity change δR/R exhibits two relaxing components: a fast component with a time constant of subpicosecond and a slow component with time constant ranging from tens of ps to hundreds of ps. The amplitude of the fast component exhibits the similar temperature depence with that of the resistivity, and the neutron scattering intensity due to nanoscale correlated polarons. The results strongly suggest that the fast photoinduced reflectivity change may have been due to the photoexcitation and trapping process of correlated Jahn-Teller (T-J) polarons in the paramagnetic (PM) and ferromagnetic (FM) phases.",

author = "Kaung-Hsiung Wu and Hsu, {T. I.} and Chen, {I. J.} and Shih, {H. C.} and Chih-Wei Luo and Uen, {T. M.} and Jiunn-Yuan Lin and Jenh-Yih Juang and T. Kobayashi",

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doi = "10.1088/1742-6596/150/4/042230",

language = "American English",

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TY - JOUR

T1 - Ultrafast polaron dynamics in La 0.7 Ca 0.3 MnO 3 thin films

AU - Wu, Kaung-Hsiung

AU - Hsu, T. I.

AU - Chen, I. J.

AU - Shih, H. C.

AU - Luo, Chih-Wei

AU - Uen, T. M.

AU - Lin, Jiunn-Yuan

AU - Juang, Jenh-Yih

AU - Kobayashi, T.

PY - 2008/8/6

Y1 - 2008/8/6

N2 - In this work, we use ultrafast optical pump-optical probe (OPOP) spectroscopy to probe the polaron dynamics in La 0.7 Ca 0.3 MnO 3 (LCMO) thin films. The temporal evolution in transient reflectivity change δR/R exhibits two relaxing components: a fast component with a time constant of subpicosecond and a slow component with time constant ranging from tens of ps to hundreds of ps. The amplitude of the fast component exhibits the similar temperature depence with that of the resistivity, and the neutron scattering intensity due to nanoscale correlated polarons. The results strongly suggest that the fast photoinduced reflectivity change may have been due to the photoexcitation and trapping process of correlated Jahn-Teller (T-J) polarons in the paramagnetic (PM) and ferromagnetic (FM) phases.

AB - In this work, we use ultrafast optical pump-optical probe (OPOP) spectroscopy to probe the polaron dynamics in La 0.7 Ca 0.3 MnO 3 (LCMO) thin films. The temporal evolution in transient reflectivity change δR/R exhibits two relaxing components: a fast component with a time constant of subpicosecond and a slow component with time constant ranging from tens of ps to hundreds of ps. The amplitude of the fast component exhibits the similar temperature depence with that of the resistivity, and the neutron scattering intensity due to nanoscale correlated polarons. The results strongly suggest that the fast photoinduced reflectivity change may have been due to the photoexcitation and trapping process of correlated Jahn-Teller (T-J) polarons in the paramagnetic (PM) and ferromagnetic (FM) phases.

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ER -

Ultrafast polaron dynamics in La _0.7 Ca _0.3 MnO ₃ thin films

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