Charge Ordering and Ferromagnetic Transition in Single-Crystal Eu_4As_3(Condensed Matter : Electronic Structure, Electrical, Magnetic and Optical Properties)

概要

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A structural transition from the cubic anti-Th_3P_4 structure to the trigonal one has been found in the single crystal of Eu_4As_3 as the temperature is decreased below 340K. Anomalies in the structural, transport and thermal properties associated with this transition are very similar to those found in the charge ordering of Yb_4As_3 and Sm_4Bi_3. The absence of orbital moment for Eu^<2+> ions indicates that the orbital freedom plays no role in the charge ordering in Eu_4As_3. The ferromagnetic transition at 18 K is dominated by the exchange interaction between a divalent ion and a trivalent ion. We also discuss the role of the orbital freedom in the charge ordering of Eu_4As_3, Yb_4As_3, and Sm_4Bi_3.
社団法人日本物理学会の論文
2003-12-15