Raman Scattering in the Inorganic Spin-Peierls System α′-Na1-δV2O5

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  • Kuroe Haruhiko
    Department of Physics, Sophia University, 7–1 Kioi–cho, Chiyoda–ku, Tokyo 102–8554
  • Seto Hideki
    Department of Physics, Sophia University, 7–1 Kioi–cho, Chiyoda–ku, Tokyo 102–8554
  • Sasaki Jun–ichi
    Department of Physics, Sophia University, 7–1 Kioi–cho, Chiyoda–ku, Tokyo 102–8554
  • Sekine Tomoyuki
    Department of Physics, Sophia University, 7–1 Kioi–cho, Chiyoda–ku, Tokyo 102–8554
  • Isobe Masahiko
    Institute for Solid State Physics, The University of Tokyo, 7–22–1 Roppongi, Minato–ku, Tokyo 106–8666
  • Ueda Yutaka
    Institute for Solid State Physics, The University of Tokyo, 7–22–1 Roppongi, Minato–ku, Tokyo 106–8666

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タイトル別名
  • Raman Scattering in the Inorganic Spin-Peierls System α<SUP>′</SUP>-Na<SUB> 1-δ</SUB>V<SUB>2</SUB>O<SUB>5</SUB>
  • Raman Scattering in the Inorganic Spin-
  • Raman Scattering in the Inorganic Spin-Peierls System<i>α</i><sup>′</sup>-Na<sub><b>1</b>-<i>δ</i></sub>V<sub><b>2</b></sub>O<sub><b>5</b></sub>

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説明

We have studied the spin-Peierls (SP) transition in α '-Na1-δV2O5 (δ = 0, 0.01 and 0.1) by means of Raman scattering.At room temperature, we observe six A1 and three A2 phonon modes and a broad Raman band.Below TSP several new peaks and a new broad band appear.The new peak at 62 cm-1 originates from the SP-gap excitation.The new peak at 128 cm-1 and the new broad band between 130 and 400 cm-1 come from two magnetic excitations.The new peaks at 102, 646 and 944 cm-1 are assigned to the folded phonon modes and their Na+-ion deficiency dependence shows that the defect of Na+ ion suppresses the SP transition.The polarized Raman spectra below TSP suggest that the possible crystal symmetry is Cs2(Pn) or C11(P1).The asymmetric lineshape of the 531-cm-1 peak superimposed on the electronic Raman band from the d-d transition around 600 cm-1 is interpreted in terms of the Fano resonance between the electronic continuous band and the phonon with a finite lifetime.The defects of the Na+ ions reduce the Fano effect because the lifetime of the phonon and the phonon-continuum interaction are decreased.

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