Low-temperature magnetic anomaly in magnetite

摘要: We have studied experimentally the responses of high-quality single crystals stoichiometric synthetic magnetite to applied weak dc and ac magnetic fields in range 6--60 K, far below Verwey transition. The results can be compared so-called after effects (MAE) measurements, which are most extensive measurements at these temperatures. present a novel point view on relaxation phenomena encountered temperatures---the low-temperature anomaly, addressing striking difference between conventional susceptibility those accompanying MAE i.e., periodic excitations with strong pulses. also draw connection this anomaly glasslike transition, discuss possible mechanisms responsible for effects.