Electron spin resonance in three spin-1/2 dimer systems: VO(HPO4)·0.5H2O, KZn(H2O)(VO)2(PO4)2(H2PO4), and CsV2O
Résumé
Using X-band electron spin resonance (ESR) spectroscopy, we investigate the magnetic properties of the
low-dimensional quantum-spin systems VO(HPO4)·0.5H2O, KZn(H2O)(VO)2PO4)2(H2PO4), and CsV2O5, where the magnetic V4+(=1/2) ions are arranged in pairs. By studying the temperature dependence as well as
the angular dependence of the ESR spectra, we find that these systems, which may be well described as spin- 1/2
dimer systems, show a change in behavior as a function of temperature. At room temperature, in accordance
with the Kubo-Tomita prediction, an exchange narrowing phenomenon takes place, whereas linewidth broadening and then the appearance of a fine structure are instead observed at helium temperatures where spins are
strongly correlated.
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