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Investigation of the Spin-Peierls transition in CuGeO_3 by Raman scattering | | P. Lemmens
; B. Eisener
; M. Brinkmann
; L.V. Gasparov
; G. Güntherodt
; P.v. Dongen
; W. Richter
; M. Weiden
; C. Geibel
; F. Steglich
; | | Date: |
30 Apr 1996 | | Abstract: | Raman experiments on the spin-Peierls compound CuGeO$_3$ and the substituted (Cu$_{1- x}$,Zn$_x$)GeO$_3$ and Cu(Ge$_{1-x}$,Ga$_x$)O$_3$ compounds were performed in order to investigate the response of specific magnetic excitations of the one-dimensional spin-1/2 chain to spin anisotropies and substitution-induced disorder. In pure CuGeO$_3$, in addition to normal phonon scattering which is not affected at all by the spin-Peierls transition, four types of magnetic scattering features were observed. Below T$_{SP}$=14 K a singlet-triplet excitation at 30 cm$^{-1}$, two-magnon scattering from 30 to 227 cm$^{-1}$ and folded phonon modes at 369 and 819 cm$^{-1}$ were identified. They were assigned by their temperature dependence and lineshape. For temperatures between the spin-Peierls transition T$_{SP}$ and approximately 100 K a broad intensity maximum centered at 300 cm$^{-1}$ is observed. | | Source: | arXiv, cond-mat/9604181 | | Services: | Forum | Review | PDF | Favorites | |
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