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22
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11144222149
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note
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The optical conductivity data in Ref. 10 shows that the magnitude at 1.55 eV is about 0.2 relative to that at 0.65 eV. On the other hand, the penetration depth L of 40 nm has been deduced at 0.65 eV in Ref. 20. Then we could roughly estimate L at 1.55 eV to be 200 nm for a constant dielectric constant in the wavelength region, although L of a few μm has been estimated at the same photon energy in Ref. 18. In this paper, we tentatively use L=200 nm at 1.55 eV.
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24
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11144220417
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note
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We used a Au:Fe-chromel thermocouple to measure temperature of the cold fingure of cryostat, on which specimens were attached by using thermal-conducting grew (GE-7031). Although a certain amount of laser-induced heating may be unavoidable due to the finite heat capacity of the sample, we could not determine the amount of temperature increase experimentally. However, as discussed in several parts of text, it is presumed that the laser-induced heating does not give any significant effects in the photoinduced processes of the phase transitions (see also Refs. 1 and 18).
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25
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0020814204
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-2. Therefore, if the formation of N phases were due to laser-induced heating, then a sharp step-wise change of the yield of N-phase domains from zero to unity would be expected. Such a dependence is not the case in Fig. 2, revealing that the energy absorbed are mostly used to convert the electronic states of the crystal without generating lattice heat in this crystal.
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27
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11144223505
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note
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The relation should be plotted as a function of twice of the wavevector at a particular probe wavelength. Since wavelength-dependent reflective indexes for the probe light polarized parallel and perpendicular to the a axis are not available in literatures, we simply plot the frequencies as a function of photon energy to show the dispersion.
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28
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84886850386
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37
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11144247536
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note
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Iwai et al. have found a similar low-frequency mode in their reflection studies at 77 K in Ref. 20. They assigned the mode to the coherent motion of the NI domain boundary over a macroscopic scale, based on the less pronounced dispersion of the mode.
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