Successive Magnetic Transitions in a Frustrated Compound YbAgGe (Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties)

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Low-temperature properties of a heavy fermion compound YbAgGe have been investigated by electrical resistivity, specific heat and magnetization measurements on a single crystalline sample. This compound, crystallizing in the hexagonal ZrNiAl-type structure, undergoes two magnetic phase transitions at T_<M1> = 0.8 K (second order) and T_<M2> = 0.65 K (first order). Below T_<M2>, the jump of the resistivity along the a axis indicates gap formation on the Fermi surface along the a axis. The extremely small magnetic entropy of 0.6J/mol K released at T_<M1> is attributed to the combination of the Kondo effect and magnetic frustration effect. When the magnetic field B ‖ a is increased to 5 T, T_<M1> is depressed to 0 K. At this critical magnetic field, the magnetic susceptibility χ follows the Curie-Weiss law, χ^<-1> - χ^<-1>_0 α T, in a wide temperature range from 0.45 K to 300 K.
社団法人日本物理学会の論文
2004-03-15