Rapid Suppression of the Commensurate Magnetic Ordered Phase of PrB6 by La Doping

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  • Rapid Suppression of the Commensurate Magnetic Ordered Phase of PrB<sub>6</sub> by La Doping

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Abstract

We have studied the magnetization, electrical resistivity and magnetic phase diagram of PrxLa1−xB6. The x dependence of the incommensurate (IC) magnetic ordering temperature, TIC1, is similar to that of NdxLa1−xB6. The noncollinear commensurate magnetic ordering is rapidly suppressed by La doping. These suggest that the IC magnetic ordering originates from the long-range RKKY-type exchange interaction and that the short-range Oxy-type AFQ interaction, which is easily affected by the local disturbance, is associated with the formation of the commensurate magnetic ordering in the C phase. The magnetic phase diagram of Pr0.8La0.2B6 is very different from those of PrB6 and Pr0.9La0.1B6. Although there exists the C and IC1 phases at H=0 in the latter two compounds, there exists only the IC1 phase at H=0 in Pr0.8La0.2B6. However, the C phase appears above 6 T only for H||⟨111⟩. The unusual magnetic phase diagram for H||⟨111⟩ is explained as a result of the competition between the exchange, quadrupolar and Zeeman interactions by taking into account the domain distribution, that depends on the applied magnetic field direction.

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