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Volumn 75, Issue 7, 2006, Pages

Infrared and Raman studies of the charge-ordering phase transition at ∼170 K in the quarter-filled organic conductor, β″-(ET)(TCNQ)

Author keywords

BEDT TTF; Charge order; Infrared and Raman; Organic conductor; TCNQ

Indexed keywords


EID: 33847318816     PISSN: 00319015     EISSN: 13474073     Source Type: Journal    
DOI: 10.1143/JPSJ.75.074720     Document Type: Article
Times cited : (12)

References (56)
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    • 3 system, see D. B. McWhan, A. Menth, J. P. Remeika, W. F. Brinkman and T. M. Rice: Phys. Rev. B 7 (1973) 1920;
    • 3 system, see D. B. McWhan, A. Menth, J. P. Remeika, W. F. Brinkman and T. M. Rice: Phys. Rev. B 7 (1973) 1920;
  • 2
    • 0042208354 scopus 로고    scopus 로고
    • 2X system, see P. Limelette, P. Wzietek, S. Florens, A. Georges, T. A. Costi, C. Pasquier, D. Jerome, C. Meziere and P. Batail: Phys. Rev. Lett. 91 (2003) 016401.
    • 2X system, see P. Limelette, P. Wzietek, S. Florens, A. Georges, T. A. Costi, C. Pasquier, D. Jerome, C. Meziere and P. Batail: Phys. Rev. Lett. 91 (2003) 016401.
  • 20
    • 33847333366 scopus 로고    scopus 로고
    • K. Yakushi, K. Suzuki, K. Yamamoto, T. Yamamoto and A. Kawamoto: to be published. in J. Low Temp. Phys.
    • K. Yakushi, K. Suzuki, K. Yamamoto, T. Yamamoto and A. Kawamoto: to be published. in J. Low Temp. Phys.
  • 36
    • 33847300576 scopus 로고    scopus 로고
    • 5 and other intramolecular phonon modes.
    • 5 and other intramolecular phonon modes.
  • 40
    • 33847333365 scopus 로고    scopus 로고
    • 3 band remained in the same position.
    • 3 band remained in the same position.
  • 46
    • 33847333364 scopus 로고    scopus 로고
    • As shown in Fig. 3, the merged band is slightly deviated toward the charge-rich side from the center between the split bands. To reproduce this deviation, we adopted a slightly longer stay time for the charge-rich site (pI > pN, This result implies that the charge-rich site is more stable than the charge-poor site. The center of the TCNQ dimer has slightly higher negative-charge density compared with the center between the dimers. It is likely that the site-energy difference at ET molecules comes from the electrostatic potential produced by the TCNQ dimer, since the short-range ordered lattice modulation remains throughout the whole temperature range. The Raman-active mode (v2 of ET, b1) shows a more pronounced version of the same trend. In this case, the interaction with the closely located v3 mode (b2) makes the situation more complicated, as discussed previously.36
    • 36
  • 47
    • 33847307555 scopus 로고    scopus 로고
    • 2 in region IV.
    • 2 in region IV.
  • 48
    • 33847249033 scopus 로고    scopus 로고
    • There is another incoherent optical excitation at ∼ U with very weak intensity, which corresponds to the optical transition from the lower Hubbard to the upper Hubbard band
    • There is another incoherent optical excitation at ∼ U with very weak intensity, which corresponds to the optical transition from the lower Hubbard to the upper Hubbard band.
  • 51
    • 33847294303 scopus 로고    scopus 로고
    • We name the high-temperature metal-like state the bad CO state from an analogy with the bad insulator that describes the high-temperature semiconducting state in a strongly correlated half-filled system.
    • We name the high-temperature metal-like state the "bad CO state" from an analogy with the "bad insulator" that describes the high-temperature semiconducting state in a strongly correlated half-filled system.
  • 53
    • 33847248523 scopus 로고    scopus 로고
    • 3+ embedded in a high-quality sapphire anvil cell disturbs the Raman spectrum in this spectral region.
    • 3+ embedded in a high-quality sapphire anvil cell disturbs the Raman spectrum in this spectral region.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.