beta-Cu3V2O8: Magnetic ordering in a spin-1/2 kagome-staircase lattice

Abstract

The spin-1/2 Cu2+ ions in beta-Cu3V2O8 occupy the sites of a Kagome-staircase lattice, an anisotropic variant of the Kagome net: buckled layers and imbedded plaquettes of three edge-shared CuO4 squares break the ideal Kagome symmetry. Susceptibility and heat capacity measurements show the onset of short-range ordering at approximately 75 K, and a magnetic phase transition with the characteristics of antiferromagnetism at ~29 K. Comparison to the Curie Weiss theta (theta,CW = -135 K) indicates that the geometric frustration is largely relieved by the anisotropy. A ferromagnetic contribution to the magnetization below the ordering temperature and negative magnetization in zero-field cooled measurements at low fields are attributed to uncompensated spins at grain boundaries or defects.

9 pages, 5 figures

References in corpus (2)

• Spin-1/2 Kagome Like Lattice in Volborthite Cu3V2O7(OH)2-H2O
• The Kagome-staircase lattice: Magnetic ordering in Ni3V2O8 and Co3V2O8

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