Abstract
${}^{1}\mathrm{H}$ nuclear-magnetic-resonance and magnetization measurements have been performed in the molecule-based solid $[\mathrm{Cu}(\mathrm{btaO}{)}_{2}(\mathrm{MeOH}){]}_{n}$ (btaOH stands for 1-hydroxybenzotriazolate) as a function of temperature. The compound exhibits a critical transition at ${T}_{c}=5.7\mathrm{K}$ from a high-temperature paramagnetic phase to a low-temperature magnetic phase characterized by relatively strong ferromagnetic interactions. The experimental results are best analyzed considering that the ground state of the system is a random-field ferromagnetic state in the absence of an external magnetic field. The dynamics of the electronic-spin fluctuations in the low-temperature magnetic phase are estimated using a two-level system model.
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