Abstract
We have measured the ac- and dc-susceptibilities of semiconducting Vanadium Oxide Bronze (VOB) containing Al and Fe donor atoms. Due to structural reasons, the donor atoms are randomly distributed and transfer their three electrons to the non-magnetic vanadium atoms, thereby creating randomly three V4+ atoms. The magnetic ordering of the vanadium subsystem has previously been attributed to antiferromagnetically coupled spin pairs of V4+ ions [1]. The measured susceptibilities are similar to those of spin glasses. Comparison of the data with the calculated isothermal susceptibility shows that the system is far away from equilibrium below the magnetic ordering temperatureTM.
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