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Effects of in-chain and off-chain substitutions on spin fluctuations in the spin-Peierls compound CuGeO_3 | | P. Lemmens
; M. Fischer
; G. Güntherodt
; C. Gros
; P.G.J. van Dongen
; M. Weiden
; W. Richter
; C. Geibel
; F. Steglich
; | | Date: |
6 Mar 1997 | | Subject: | Strongly Correlated Electrons | cond-mat.str-el | | Affiliation: | 2. Physikalisches Institut, RWTH-Aachen), C. Gros (Institut für Physik, Universität Dortmund), P.G.J. van Dongen (Theoretische Physik III, Universität Augsburg), M. Weiden, W. Richter, C. Geibel, F. Steglich (FB Technische Physik, TH-Dar | | Abstract: | The effect of in-chain and off-chain substitutions on 1D spin fluctuations in the spin-Peierls compound CuGeO_3 has been studied using Raman scattering in order to understand the interplay between defect induced states, enhanced spin-spin correlations and the ground state of low dimensional systems. In-chain and off-chain substitutions quench the spin-Peierls state and induce 3D antiferromagnetic order at Tleq 5 K. Consequently a suppression of a 1D gap-induced mode as well as a constant intensity of a spinon continuum are observed at low temperatures. A 3D two-magnon density of states now gradually extends to higher temperatures Tleq 60K compared with pure CuGeO_3. This effect is more pronounced in the case of off-chain substitutions (Si) for which a Néel state occurs over a larger substitution range, starting at very low concentrations. Besides, additional low energy excitations are induced. These effects, i.e. the shift of a dimensional crossover to higher temperatures are due to an enhancement of the spin-spin correlations induced by a small amount of substitutions. The results are compared with recent Monte Carlo studies on substituted spin ladders, pointing to a similar instability of coupled, dimerized spin chains and spin ladders upon substitution. | | Source: | arXiv, cond-mat/9703060 | | Services: | Forum | Review | PDF | Favorites | |
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