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Volumn 70, Issue 14, 2004, Pages

Femtosecond time-resolved reflection spectrescopy of photoinduced ionic-neutral phase transition in TTF-CA crystals

Author keywords

[No Author keywords available]

Indexed keywords

ARTICLE; CELL AGGREGATION; CELL PROLIFERATION; CLUSTER ANALYSIS; CRYSTAL STRUCTURE; EXCITATION; LIGHT; PHASE TRANSITION; PHONON; SPECTROSCOPY;

EID: 42749105466     PISSN: 01631829     EISSN: None     Source Type: Journal    
DOI: 10.1103/PhysRevB.70.144112     Document Type: Article
Times cited : (33)

References (37)
  • 4
    • 0003602958 scopus 로고    scopus 로고
    • Relaxation of excited states and photo-induced structural phase transitions
    • Springer-Verlag, Berlin
    • "Relaxation of excited states and photo-induced structural phase transitions," edited by K. Nasu, Vol. 124 of Springer Series in Solid State Sciences (Springer-Verlag, Berlin, 1997).
    • (1997) Vol. 124 of Springer Series in Solid State Sciences , vol.124
    • Nasu, K.1
  • 12
  • 13
    • 0001314562 scopus 로고
    • N. Nagaosa, Solid State Commun. 57, 179 (1986); and J. Phys. Soc. Jpn. 55, 3488 (1986).
    • (1986) J. Phys. Soc. Jpn. , vol.55 , pp. 3488
  • 22
    • 11144222149 scopus 로고    scopus 로고
    • note
    • 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.
  • 24
    • 11144220417 scopus 로고    scopus 로고
    • note
    • 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).
  • 25
    • 0020814204 scopus 로고
    • -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.
    • (1983) Solid State Commun. , vol.47 , pp. 789
    • Ayache, C.1    Torrance, J.B.2
  • 27
    • 11144223505 scopus 로고    scopus 로고
    • note
    • 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.
  • 37
    • 11144247536 scopus 로고    scopus 로고
    • note
    • 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.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.