Manifestation of spin-glass-like behavior in the organometallic magnet

Ac susceptibility (χac) and dc magnetization (Mdc) of the organometallic magnet Na[FeO6(C10H8N)3] have been studied in temperature range of 4.2-200 K, in an external magnetic field up to 16 kOe. Some peculiarities of the χac and Mdc behavior, which are characteristic of spin-glasses, e.g. cusps in the susceptibility and zero-field-cooled magnetization, an irreversibility between the field-cooled and zero-field-cooled magnetization and dependences of the Tcusp temperature on the frequency and the intensity of the magnetic field, were observed at low temperatures.