Eur. Phys. J. B 22, 321-326 (2001)
https://doi.org/10.1007/s100510170109

Magnetic resonance on LiCuVO₄

¹ Experimentalphysik V, Elektronische Korrelationen und Magnetismus, Institut für Physik, Universität Augsburg, 86135 Augsburg, Germany
² Physikalisches Institut, Johann-Wolfgang-Goethe-Universität, 60054 Frankfurt, Germany

Corresponding author: ^a n.buettgen@physik.uni-augsburg.de

Received: 22 January 2001
Revised: 6 May 2001
Published online: 15 August 2001

Abstract

EPR and ⁷Li NMR measurements were performed in the distorted inverse spinel V(LiCu)O₄ down to 1.5 K. Anisotropy effects on magnetic resonance spectra due to the Jahn-Teller distortion of the oxygen octahedra surrounding the copper ions are discussed. The estimation of the spin-spin interactions deduced from the EPR-relaxation rate ΔH reveals a situation comparable to the prototypical one-dimensional S=1/2 Heisenberg antiferromagnet CuGeO₃. Approaching three-dimensional antiferromagnetic order (T_N≈2 K) from above, both magnetic relaxation rates, ΔH_EPR and ⁷(1/T), respectively, exhibit nearly the same critical divergence reminding to the onset of three-dimensional order in two-dimensional layered systems.