Magnetic fluctuation spectrum of CuGeO3: Raman scattering
- van Loosdrecht, P. H. M.
- Boucher, J. P.
- Martinez, G.
- Dhalenne, G.
- Revcolevschi, A.
Publication date
January 1996
DOIAbstract
Raman spectra of the magnetic fluctuation spectrum of CuGeO3 are presented for 4<T<300 K and B≤20 T. For B=0 the results show good agreement with theoretical expectations for a one-dimensional isotropic Heisenberg antiferromagnet which exhibits a spin–Peierls transition. In the presence of a magnetic field the phase transition to the incommensurately modulated phase is observed around B=12.8 T at T=4.2 K. The spectra obtained in the high field phase clearly show evidence for a well-defined spin fluctuation spectrum, which appears to present an intermediate case between the dimerized phase and the short-range order regime of the uniform phase
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