Effect of Ga Substitution on the Γ3 Doublet Ground State in PrIr2Zn20
Effect of Ga Substitution on the Γ3 Doublet Ground State in PrIr2Zn20
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Ga 取代对 PrIr2Zn20 中 Γ3 双重态基态的影响
DOI：
10.1088/1742-6596/683/1/012011
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发表时间：
2016
期刊：
影响因子：
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通讯作者：
K. Umeo and T. Takabatake
中科院分区：
文献类型：
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作者：
T. Onimaru;K. Uenishi;Y. Yamane;K. Wakiya;K. T. Matsumoto;K. Umeo and T. Takabatake
电阻率 ρ、比热 C 和磁化率 χ 测量结果是在 PrIr 2 Zn 20–x Ga x（x= 0.5 和 1.0）上报告的。冷却时，ρ (T) 单调减少到比 PrIr 2 Zn 20 大两个数量级的残差值。C m (T) 在 10 K 左右的宽峰可以通过具有 Γ 3 双重基态和 Γ 4 三重激发态的二能级模型重现。随着 x 的增加，磁熵释放转移到更高的温度。 T< 5 K 时 χ (T) 的增加与 x= 0 时 χ (T) 的饱和形成对比。这些观察结果表明，由于 Ga 取代降低了 Pr 位点的局部对称性，导致基态双峰分裂。
Electrical resistivity ρ, specific heat C, and magnetic susceptibility χ measurements are reported on PrIr 2 Zn 20–x Ga x for x= 0.5 and 1.0. On cooling, ρ (T)'s monotonically decrease to the residual values which are two orders of magnitudes larger than that of PrIr 2 Zn 20. A broad hump in C m (T)'s at around 10 K can be reproduced by the two-level model with the Γ 3 doublet ground state and the Γ 4 triplet excited state. The magnetic entropy release shifts to higher temperatures with increasing x. The increase in χ (T) at T< 5 K contrasts with the saturation of χ (T) for x= 0. These observations indicate the splitting of the ground state doublet due to the lowering of the local symmetry at the Pr site by the Ga substitution.