Magnetic Properties of Eu0.9Yb0.1B6

Resumo

The magnetic properties of substitutional solid solutions Eu_0.9Yb_0.1B₆ have been investigated in the temperature range of 2–300 K in fields up to 5 T. The data obtained confirm that the state with the electronic and magnetic phase separation (typical of europium hexaboride) is implemented in Eu_0.9Yb_0.1B₆ when the system metallization (T_M ≈ 15 K) precedes the ferromagnetic ordering (T_C ≈ 11.4 K). An analysis of the curves M(H) in the Belov–Arrott coordinates makes it possible to evaluate spontaneous magnetization M_sp and zero field susceptibility χ₀ and determine the character of their critical behavior near the Curie point. The calculated critical indices (γ ≈ 1.28 and β ≈ 0.34) are in agreement with the predictions of the three-dimensional Heisenberg model.