Short-range and long-range magnetic ordering inα−CuV2O6

Magnetic properties of the triclinic copper vanadate $\alpha -{\mathrm{CuV}}_2{\mathrm{O}}_6$ with linear chains of edge-sharing ${\mathrm{CuO}}_6$ octahedra were studied by magnetic susceptibility and electron-spin-resonance measurements. The broad maximum of a magnetic susceptibility at $T_M=44\mathrm{}\mathrm{K}$ corresponding to the intrachain exchange interaction $J=34\mathrm{}\mathrm{K}$ indicates one-dimensional short-range magnetic ordering within the chains. Three-dimensional long-range antiferromagnetic ordering takes place at $T_N=24\mathrm{}\mathrm{K},$ suggesting a rather large value for the interchain exchange interaction $J_{\perp }\sim 16.5\mathrm{K}.$ The energy gap found in the antiferromagnetic resonance spectrum 76 GHz agrees with the spin-flop magnetic-field value of about 2.7 T.