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

T. Masuda; A. Zheludev; B. Grenier; S. Imai; K. Uchinokura; E. Ressouche; S. Park

doi:10.1103/PhysRevLett.93.077202

paper

Cooperative ordering of gapped and gapless spin networks in Cu $_{2}$ Fe $_{2}$ Ge $_{4}$ O $_{13}$

arXiv:cond-mat/0404468 · doi:10.1103/PhysRevLett.93.077202

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

Cooperative ordering of gapped and gapless spin networks in Cu2​Fe2​Ge4​O13​

Abstract

Cooperative ordering of gapped and gapless spin networks in Cu $_{2}$ Fe $_{2}$ Ge $_{4}$ O $_{13}$