Cooperative ordering of gapped and gapless spin networks in Cu${}_2$Fe${}_2$Ge${}_4$O${}_{13}$

Abstract

The unusual magnetic properties of a novel low-dimensional quantum ferrimagnet Cu${}_2$Fe${}_2$Ge${}_4$O${}_{13}$ are studied using bulk methods, neutron diffraction and inelastic neutron scattering. It is shown that this material can be described in terms of two low-dimensional quantum spin subsystems, one gapped and the other gapless, characterized by two distinct energy scales. Long-range magnetic ordering observed at low temperatures is a cooperative phenomenon caused by weak coupling of these two spin networks.

4 pages, 4 figures

References in corpus (2)

• Spin-Vacancy-Induced Long-Range Order in a New Haldane-Gap Antiferromagnet
• Field-induced 3- and 2-dimensional freezing in a quantum spin liquid

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