Abstract
We have studied the magnetic and electrical properties of new ternary europium magnesium silicide Eu2Mg4Si3. The single crystalline Eu2Mg4Si3 has been prepared by the Mg self-flux method. The compound crystalizes in the hexagonal Hf2Co4P3-type structure with space group P6¯2m with unit cell parameters a=14.78(3)Å and c=4.434(6)Å. Magnetic, electrical, and thermal properties indicate that the system undergoes two successive phase transitions, occurring at TN1=9.6K and TN2=8.4K. The estimated effective magnetic moment is close to the moment of free Eu2+ ion. The electrical resistivity data ρ(T) for Eu2Mg4Si3 show a metallic-like behavior from room temperature down to about 100K. However, the ρ(T) data exhibit a notable upturn below 80K and a maximum around TN1 and then suddenly decrease with decreasing temperature. These features are strongly suppressed by applying magnetic fields and a metallic temperature dependence eventually exhibits over the whole temperature range in a magnetic field of 30kOe. Such behavior is observed in some magnetoresistive compounds.
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