Photoinduced transient thermoelectric effect in a perovskite manganite<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Pr</mml:mi></mml:mrow><mml:mrow><mml:mn>0.67</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Sr</mml:mi></mml:mrow><mml:mrow><mml:mn>0.33</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">MnO</mml:mi></mml:

Sasaki, Minoru; Wu, G.R.; Gao, Wenxiu; Negishi, H.; Inoue, M.; Xiong, Ge

doi:10.1103/physrevb.59.12425

Cited by 10 publications

(5 citation statements)

References 24 publications

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“…LITV signals are observed scaling to the resistance of thin films [17], and the doping dependence always shows the same behaviors as the change in DS upon the charge carrier density [14,15]. These characters can provide some important information on electronic transport in these complex materials [17][18][19].…”

Section: Introductionmentioning

confidence: 76%

Doping dependence of laser-induced transverse thermoelectric voltages in the perovskite Nd2−x Ce x CuO4 thin films

et al. 2015

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Large laser-induced thermoelectric voltages (LITVs) are measured in the electron-doped Nd 2-x Ce xCuO 4 thin films grown on the vicinal-cut SrTiO 3 substrates by pulsed laser deposition. The dependence of LITV signals upon the doping carrier density is investigated by changing the Ce content of the films. The optimum Ce dopant corresponding to the largest voltage is found and is attributed to the two-dimensional transport behaviors of the localized electrons. The shorter laser irradiation always induces the larger voltage signals in samples with richer Ce content, suggesting the optimum dopant level is sensitive to the wavelength of excitation source. Thus, the behaviors of LITV signals are resulted from both effects of the anisotropic thermoelectric transport and the optical properties of the thin films. The doping dependence related with an anisotropic charge transport may come from the change in carrier density and the modification in energy band configuration.

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Section: Introductionmentioning

confidence: 76%

Doping dependence of laser-induced transverse thermoelectric voltages in the perovskite Nd2−x Ce x CuO4 thin films

et al. 2015

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“…The photoinduced effects on the strongly correlated electron system [1][2][3][4][5][6][7][8][9][10] is one of the hottest topics in solid state physics both from the fundamental and technical points of view. Especially in the perovskite-type doped manganites, the strong coupling between the spin, charge and orbital degree of freedoms causes a variety of magnetic/electronic phases.…”

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confidence: 99%

Electronic structure and photoinduced effect ofLaMnO3film

et al. 2006

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The electronic structure as well as the photoinduced effect were investigated in an antiferomagnetic LaMnO 3 film. We found characteristic spin-dependent absorption bands at Ϸ1.6 eV and ϳ3 eV, and ascribed them to the d − d transitions into the adjacent Mn 3+ sites with the parallel and antiparallel spins, respectively. We further observed that the photoexcitation of the down-spin d electrons significantly influences these d-d bands, and ascribed the behavior to the photoinduced disorder of the Mn 3+ spins.

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“…The origin of ferromagnetism is double-exchange interaction 8 yielding a strong correlation between magnetization and charge transport properties. Photoinduced effects on the picosecond timescale for the ferromagnetic phase of manganites have been previously studied by conventional pumpprobe spectroscopy [9][10][11] . The first report on laser-induced demagnetization was presented by Matsuda et al 9 .…”

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confidence: 99%

Spin-lattice relaxation phenomena in manganite La _0.7 Sr _0.3 MnO ₃ thin films

et al. 2006

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2Time-resolved magneto-optics was used to study spin-lattice relaxation dynamics in thin epitaxial La 0.7 Sr 0.3 MnO 3 films. Two distinct recovery regimes of the ferromagnetic order can be resolved upon photoexcitation, which manifest themselves by two different relaxation times. A pump pulse energy independent spin-lattice relaxation time can be deduced. Due to a weak spin-orbit coupling in manganites this spin-lattice relaxation time is much longer than in ferromagnetic metals. Heat flow into the substrate sets the ultimate recovery speed of the ferromagnetic order and allows for a determination of heat diffusion properties of manganite films. PACS number(s): 78.47.+p , 75.40.Gb 3 Significant research effort has been focused on ultrafast magnetization and demagnetization dynamics in the recent years. An all-optical technique employing short laser pulses may be of interest, as field pulse assisted magnetization switching cannot be faster than a magnetization precession cycle 1 . However, a special demagnetization mechanism is required -an optical pulse can barely change the magnetization directly.Ultrafast magnetization dynamics has been studied in ferromagnetic 2-4 and various other material systems 5,6 . On the other hand, colossal magnetoresistive manganites are promising candidates for ultrafast spin control due to coupled spin, charge, orbital and lattice degrees of freedom 7 .Perovskite manganites exhibit an insulator to metal transition usually related to a paraferromagnetic phase transition at the Curie temperature. The origin of ferromagnetism is double-exchange interaction 8 yielding a strong correlation between magnetization and charge transport properties. Photoinduced effects on the picosecond timescale for the ferromagnetic phase of manganites have been previously studied by conventional pumpprobe spectroscopy [9][10][11] . The first report on laser-induced demagnetization was presented by Matsuda et al. 9 . A rapid change of the photoinduced absorption within 1-2 ps and a following gradual change up to about 200 ps was found. The ultrafast component is attributed to electron-phonon thermalization, whereas the subsequent slower component with a temperature dependent time constant to spin and lattice thermalization. However, the evaluated time scales for the demagnetization dynamics were based on changes in optical absorption. Thus, spin channels, such as spin-lattice relaxation, have not been discerned in the absorption changes. 4In the present work, magnetization dynamics in epitaxial La 0.7 Sr 0.3 MnO 3 (LSMO) films was investigated by time-resolved magneto-optics where the Kerr rotation was employed as a reliable probe of magnetization 12 . Special emphasis was put on the determination of the spin-lattice relaxation time, a key quantity to answer the question about the fundamental speed limit of spin manipulation in this material. Upon arrival of a short laser pulse a collapse of the ferromagnetic order takes place accompanied by spin-lattice thermalization. The deduced spin-lattice tim...

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Photoinduced transient thermoelectric effect in a perovskite manganitePr0.67Sr0.33MnO

Cited by 10 publications

References 24 publications

Doping dependence of laser-induced transverse thermoelectric voltages in the perovskite Nd2−x Ce x CuO4 thin films

Doping dependence of laser-induced transverse thermoelectric voltages in the perovskite Nd2−x Ce x CuO4 thin films

Electronic structure and photoinduced effect ofLaMnO3film

Spin-lattice relaxation phenomena in manganite La _0.7 Sr _0.3 MnO ₃ thin films

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Photoinduced transient thermoelectric effect in a perovskite manganitePr0.67Sr0.33MnO

Cited by 10 publications

References 24 publications

Doping dependence of laser-induced transverse thermoelectric voltages in the perovskite Nd2−x Ce x CuO4 thin films

Doping dependence of laser-induced transverse thermoelectric voltages in the perovskite Nd2−x Ce x CuO4 thin films

Electronic structure and photoinduced effect ofLaMnO3film

Spin-lattice relaxation phenomena in manganite La 0.7 Sr 0.3 MnO 3 thin films

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Product

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Spin-lattice relaxation phenomena in manganite La _0.7 Sr _0.3 MnO ₃ thin films