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29 March 2024
 
  » arxiv » cond-mat/0111065

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Low Energy Singlets in the Excitation Spectrum of the Spin Tetrahedra System Cu_2Te_2O_5Br_2
P. Lemmens ; K.Y. Choi ; A. Ionescu ; J. Pommer ; G. Guentherodt ; R. Valenti ; C. Gros ; W. Brenig ; M. Johnsson ; P. Millet ; F. Mila ;
Date 5 Nov 2001
Subject Strongly Correlated Electrons; Materials Science | cond-mat.str-el cond-mat.mtrl-sci
AbstractLow energy Raman scattering of the s=1/2 spin tetrahedra system Cu_2Te_2O_5Br_2 is dominated by an excitation at 18 cm^{-1} corresponding to an energy E_S=0.6Delta, with Delta the spin gap of the compound. For elevated temperatures this mode shows a soft mode-like decrease in energy pointing to an instability of the system. The isostructural reference system Cu_2Te_2O_5Cl_2 with a presumably larger inter-tetrahedra coupling does not show such a low energy mode. Instead its excitation spectrum and thermodynamic properties are compatible with long range Neel-ordering. We discuss the observed effects in the context of quantum fluctuations and competing ground states.
Source arXiv, cond-mat/0111065
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