Magnetic Properties of Tetragonal Ce_<1-x>Lu_xB_2C_2 (0 ≤ x ≤ 0.31) Compounds(Condensed Matter : Electronic Structure, Electrical, Magnetic and Optical Properties)

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Specific heat, dc- and ac-magnetic susceptibility and magnetization measurements were performed on rare earth intermetallic compounds Ce_<1-x>Lu_xB_2C_2 (0 ≤ x ≤ 0.31) in order to elucidate the magnetic interaction in CeB_2C_2. In the process of the substitution of Ce by Lu in CeB_2C_2, the characteristics of magnetic transition change from a first-order transition to a second-order one. Furthermore, the spin-glass phase appears at Lu concentration x = 0.31. We suppose that the ferromagnetic (FM) and antiferromagnetic (AFM) interactions compete and nearly cancel out each other in CeB_2C_2, and hence that a biquadratic interaction might cause the first-order magnetic transition at T_N. The Lu substitution breaks the competition between AFM and FM interactions and brings forth randomness in interactions acting on each Ce moment. The typical spin-glass behavior of x = 0.31 originates in this random distribution of magnetic interactions.
社団法人日本物理学会の論文
2003-12-15