Rapid Suppression of the Commensurate Magnetic Ordered Phase of PrB_6 by La Doping(Condensed Matter : Electronic Structure, Electrical, Magnetic and Optical Properties)

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We have studied the magnetization, electrical resistivity and magnetic phase diagram of Pr_xLa_<1-x>B_6. The x dependence of the incommensurate (IC) magnetic ordering temperature, T_<IC1>, is similar to that of Nd_xLa_<1-x>B_6. 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 O_<xy>-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 Pr_<0.8>La_<0.2>B_6 is very different from those of PrB_6 and Pr_<0.9>La_<0.1>B_6. 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 Pr_<0.8>La_<0.2>B_6. However, the C phase appears above 6T 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.
社団法人日本物理学会の論文
2005-10-15