Raman Scattering in the Inorganic Spin-Peierls System α'-Na_<1-δ>V_2O_5

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概要

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• We have stttdied the srin-Peierls (SP) transition in cv'-Na? .5V205 (c5 = O, 0.01 and 0.1) byl11C8.I1S of Ranaan scattering. At roona ternperattmre, we observe six An and three Ax phononmodes and a broad Raman band. Beloxv 'Z'SP severatl nexv peaks ?tnd a new broad band appear.Tlae new peak at 62 Clll ' originates frotaa the SP-gap excitation. Tlae new peak at 128 cnn '-1and the new broad band between 130 atad 400 cna COIIIO frorta txvo tnagnetic excitations. Thenew peaks at 102, 646 and 944 cna ' are assigned to the f'olded phonon taaodes and their Na"-ion deficiency dependence shoxvs that the defect of Na" ion stmjcpresses the SP transition. Thepolarized Rarauan spectra below 'lsr suggest that the possilcle crystal syrnxaaetry is C:(Pn) orCJ (PI). The asymunetric lineshape of the 531-Clll ' peak superitaaposed on the electronic Rarnanband from the d-d transition arotnnd 600 CITI ' is interpreted in tertns of the Fano resonancebetxveen the electronic contintnotts band and the phonon with a finite lif'etiuaae. Tlae defects of theNa" ions redtnce the Fano effect becatrse the lifetirne of the phonon and the phonon-contintrttminteraction are decreased.

• 社団法人日本物理学会の論文
• 1998-08-15

著者

• UEDA Yutaka

  Institute for Solid State Physics, University of Tokyo

• 黒江 晴彦

  上智大理工

• ISOBE Masahiko

  Institute for Solid State Physics, The University of Tokyo

• Ueda Yutaka

  Institute For Solid State Physics University Of Tokyo

• SETO Hideki

  Department of Physics, Kyoto University

• Sasaki J

  Toyama Univ. Toyama

• Sasaki J

  Hirosaki Univ. School Of Medicine Hirosaki Jpn

• KUROE Haruhiko

  Department of Physics, Sophia University

• SEKINE Tomoyuki

  Department of Physics, Sophia University

• Kuroe Haruhiko

  Department Of Physics Sophia University

• Isobe Masahiko

  Institute For Materials Research Tohoku University

• SASAKI Jun-ichi

  Department of Physics,Sophia University

• Sasaki Jun-ichi

  Department Of Physics Sophia University

• Seto Hideki

  Department Of Physics Sophia University

• Sekine Tomoyuki

  Department Of Physics Faculty Of Science And Technology Sophia University

• Seto Hideki

  Department Of Physics Kyoto University

• Ueda Yutaka

  Institute For Solid State Physic The University Of Tokyo

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