科研之友
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摘要
The magnetization M and magnetoresistance of a heavy-fermion antiferromagnet YbAgGe have been measured under pressures P up to 2.7 GPa and magnetic fields B up to 9.5 T. This compound crystallizing in the hexagonal ZrNiAl-type structure with a quasi-kagome lattice of Yb ions has two magnetically ordered phases, namely, phase I (T <= T-M2 0.65 K) and phase II (T-M2 <= T <= T-M1 0.8 K). With increasing pressure to 2.2 GPa, M (B-parallel to a 9.5 T) at 0.3 K increases from 1.5 mu(B)/Yb to 1.8 mu(B)/Yb, while M (B-parallel to c = 9.5 T) hardly changes. The metamagnetic transition field in M (B-parallel to a) decreases from 4.6 T for P = to 3.3 T for P = 2.2 GPa. As the pressure exceeds P* = 1.6 GPa, both T-M and the initial slope of M (B-parallel to a) steeply increase and the area of phase I for B-parallel to a expands. These observations suggest that the magnetic frustration of the Yb quasi-kagome lattice is partially suppressed by the application of pressure above 1.6 GPa or magnetic field B-parallel to a above 4.5 T. Detailed B-T phase diagrams under pressures up to 2.7 GPa are discussed with respect to the magnetic frustration in YbAgGe.
- 出版日期2010-6
