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Nonmagnetic ground state in the cubic compounds PrNi_2Cd_(20) and PrPd_2Cd_(20)

机译:立方化合物PrNi_2Cd_(20)和PrPd_2Cd_(20)中的非磁性基态

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Temperature-dependent magnetization, specific-heat, and electrical-resistivity measurements were performed on single crystals of PrNi_2Cd_(20) and PrPd_2Cd_(20). Neither compound shows any evidence for magnetic order above 2 K. Magnetization measurements suggest that Pr ions assume a nonmagnetic Γ_1 singlet or non-Kramers Γ_3 doublet ground state. A broad peak, which is identified as a Schottky anomaly, is observed in the specific heat at low temperature. Low-lying excitations involving the 4/ electrons persist down to 2 K for both PrNi_2Cd_(20) and PrPd_2Cd_(20) and related features are also observed in the magnetization and electrical resistivity.
机译:对PrNi_2Cd_(20)和PrPd_2Cd_(20)的单晶进行随温度变化的磁化,比热和电阻率测量。两种化合物均未显示2 K以上的磁阶证据。磁化测量表明Pr离子呈非磁性Γ_1单重态或非克拉默Γ_3双重态基态。在低温下的比热中观察到一个宽峰,该峰被识别为肖特基异常。对于PrNi_2Cd_(20)和PrPd_2Cd_(20),涉及4 /电子的低激发一直持续到2 K,并且在磁化和电阻率中也观察到相关特征。

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