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

Ac susceptibility (chi(ac)) and de magnetization (M-dc) Of the organometall ic 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 t he chi(ac) and M-dc behavior, which are characteristic of spin-glasses, e.g . cusps in the susceptibility and zero-field-cooled magnetization, an irrev ersibility between the field-cooled and zero-field-cooled magnetization and dependences of the T-cusp temperature on the frequency and the intensity o f the magnetic field, were observed at low temperatures.