From the measurements of the temperature dependence of magnetization, a magnetic phase transition at 145 K with a thermal hysteresis is found for an organic radical 5-carboxy-2-thienyl nitronyl nitroxide. Ferromagnetic intermolecular interaction is observed in the high-temperature phase while antiferromagnetic interaction is obtained for the low-temperature phase.
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Tadashi Sugano (2001) studied this question.
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