Synthesis and characterization of electric and magnetic properties of the new intermetallic compounds M-3(GaTe3)(2) (M = Cr, Fe, Co)

摘要

The new amorphous intermetallic materials, M-3(GaTe3)(2) (M=Cr, Fe, Co) are prepared by using a rapid precipitation metathesis reaction between the Zintl phase material K3GaTe3 and the divalent transition metal halides in aqueous solution. The d.c. specific resistivity measurements of these materials exhibit metallic (M=Fe, Co) and semiconductor (M=Cr) behavior. The magnetic and electrical properties for these materials are examined as a function of temperature, Cr-3(GaTe3)(2) exhibits antiferromagnetic coupling between localized magnetic moments and highly temperature dependent semiconductivity. Two materials undergo a transition to a spin glass state at low temperature (for M=Fe, T-f=22 K; for M=Co, T-f=2.2 K). Magnetization data are also reported as both thermal remanent magnetization (TRM) and isothermal remanent magnetization (IRM) as a function of magnetizing field and temperature. At a magnetization field of 1 kG and a temperature of 6 K, the Fe-3(GaTe3)(2) exhibit a photomagnetic response consistent with a disruption of the spin-glass state that results from a series of pulses of ultraviolet radiation. (C) 1998 Elsevier Science S.A. [References: 27]