Abstract
We report the results of electron spin resonance (ESR) and magnetization measurements in high magnetic fields up to about 52 T on single crystal and powder samples of the cobalt compound Na 2 Co 2 (C 2 O 4 ) 3 (H 2 O) 2 which consists of two-leg ladders of Co 2+ ions. This compound was reported to be a candidate which show a signature of a quantum phase transition from a spin-liquid to a Neel ordered state [Z. Honda et al. : Phys. Rev. Lett. 95 (2005) 087204]. From our ESR and magnetization experiments, we, however, have found that the compound is well described by almost isolated antiferromagnetic dimers which are formed by the nearest Co spins on the rungs and the interaction along the rung direction is much larger than that along the leg one. The ESR frequency–field diagram, magnetic susceptibility and magnetization are in good agreement with those calculated from this isolated dimer model.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call