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Volumn 82, Issue 7, 2010, Pages

Nonuniform site-charge distribution and fluctuations of charge order in the metallic state of α-(BEDT-TTF )2 I3

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EID: 77957599300     PISSN: 10980121     EISSN: 1550235X     Source Type: Journal    
DOI: 10.1103/PhysRevB.82.075134     Document Type: Article
Times cited : (71)

References (54)
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    • -1.
    • - 1.
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    • Strictly speaking, the linear relationship cannot be applied straightforwardly to the estimation of site charge of charge-rich sites because a dipole-dipole interaction occurs between the phonon modes of charge-rich sites. However, the perturbation of the frequency by this dipole-dipole interaction is very small. This situation is similar to the case of the ν2 mode, in which the frequency is perturbed not only by site charge but also by weak electron-molecular-vibration interaction.
    • Strictly speaking, the linear relationship cannot be applied straightforwardly to the estimation of site charge of charge-rich sites because a dipole-dipole interaction occurs between the phonon modes of charge-rich sites. However, the perturbation of the frequency by this dipole-dipole interaction is very small. This situation is similar to the case of the ν 2 mode, in which the frequency is perturbed not only by site charge but also by weak electron-molecular-vibration interaction.
  • 32
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    • The linewidth of the ν23 mode involves the effect of the hidden ν22 mode. It is therefore inappropriate to compare the linewidths of the ν23 of different compounds since the separation between ν22 and ν23 differs slightly between α- (ET ) 2 I3 and α- (ET ) 2 NH4 Hg (SCN ) 4.
    • The linewidth of the ν 2 3 mode involves the effect of the hidden ν 2 2 mode. It is therefore inappropriate to compare the linewidths of the ν 2 3 of different compounds since the separation between ν 2 2 and ν 2 3 differs slightly between α - (ET) 2 I 3 and α - (ET) 2 NH 4 Hg (SCN) 4.
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    • -1 ), we neglected the effect of the slit function
    • - 1), we neglected the effect of the slit function.
  • 38
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    • To obtain the second moment of the spectrum, a much wider spectral range should be integrated.
    • To obtain the second moment of the spectrum, a much wider spectral range should be integrated.
  • 39
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    • note
    • ) 2]. As the site charge should be in the range of 0 < x < 1, the variance was restricted to the range of 3 Δ c < ∼ 0.4.
  • 42
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    • note
    • Similar results were reported by Merino They calculated the dynamical charge susceptibility and charge correlation function using a square lattice model. The collective mode which corresponds to a checkerboard CO is very softened, when the Coulomb interaction is close to a critical value. J. Merino, A. Greco, R. H. McKenzie, and M. Calandra, Phys. Rev. B 68, 245121 (2003). 10.1103/PhysRevB.68.245121
    • (2003) Phys. Rev. B , vol.68 , pp. 245121
    • Merino, J.1    Greco, A.2    McKenzie, R.H.3    Calandra, M.4
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    • note
    • - 1) of the vibronic ν 3 mode.
  • 47
    • 77957557620 scopus 로고    scopus 로고
    • As to the lattice modes, this compound involves 33 optical phonons which are classified into 3 Ag +12 Au translational modes and 15 Ag +3 Au librational modes, when the space group is P 1̄. The Ag mode is Raman active and the Au mode is infrared active. In the CO state, however, the selection rule is broken, and all of the lattice modes are detectable in both infrared and Raman spectra.
    • As to the lattice modes, this compound involves 33 optical phonons which are classified into 3 A g + 12 A u translational modes and 15 A g + 3 A u librational modes, when the space group is P 1 ̄. The A g mode is Raman active and the A u mode is infrared active. In the CO state, however, the selection rule is broken, and all of the lattice modes are detectable in both infrared and Raman spectra.
  • 53
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    • The infrared light was focused on the rectangular area of 50μm×200μm. The spectrum was taken in the cooling process.
    • The infrared light was focused on the rectangular area of 50 μ m × 200 μ m. The spectrum was taken in the cooling process.
  • 54
    • 77957586184 scopus 로고    scopus 로고
    • The Raman spectrum was measured with the polarization of E||b on the (001) crystal face using α- ( C 13 -ET ) 2 I3, as the spectrum of metallic phase is very different from that of CO phase in this condition.
    • The Raman spectrum was measured with the polarization of E || b on the (001) crystal face using α - (C 13 -ET) 2 I 3, as the spectrum of metallic phase is very different from that of CO phase in this condition.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.