Effect of La Impurities on the Phase Transitions in PrFe_4P_<12>(Condensed matter: electronic structure and electrical, magnetic, and optical properties)

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The effect of La impurities on the low-field (A phase) and high-field (B phase) ordered states in PrFe_4P_<12> has been studied using dc magnetization measurements on a series of Pr_<1-x>La_xFe_4P_<12> (x=0, 0.01, 0.05, and 0.15). It is found that the long-range A phase order evolves to a short-range one at a very small La concentration between x=0.01 and 0.05. We also find clear evidence for the existence of ferromagnetism in the sample with x≥0.05. Remarkably, the ferromagnetic ordering temperature T_C increases from 1.05K for x=0.05 to 1.45K for x=0.15, although the Weiss temperature decreases with increasing x. These observations indicate the competition between the A phase and ferromagnetic state, and the role of nesting on the A phase transition is emphasized.
社団法人日本物理学会の論文
2007-08-15