Dynamical lattice instability versus spin liquid state in a frustrated spin chain systemстатья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:The low-dimensional s=1/2 compound (NO)[Cu(NO3)3] has recently been suggested to follow the Nersesyan-Tsvelik model of coupled spin chains. Such a system shows unbound spinon excitations and a resonating-valence-bond ground state due to spin frustration. Our Raman scattering study of (NO)[Cu(NO3)3] demonstrates phonon anomalies as well as the suppression of a broad magnetic scattering continuum for temperatures below a characteristic temperature, T<T*≈100 K. We interpret these effects as evidence for a dynamical interplay of spin and lattice degrees of freedom that might lead to an instability at lower temperatures.