Absence of bulk magnetic ordering in Pr3Ru4Ge13
Absence of bulk magnetic ordering in Pr3Ru4Ge13
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Pr3Ru4Ge13 中不存在块状磁有序
DOI：
10.1016/0304-8853(95)00471-8
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发表时间：
1996
影响因子：
2.7
通讯作者：
R. Vijayaraghavan
中科院分区：
文献类型：
--
作者：
S. Ramakrishnan;K. Ghosh;S. Dhar;S. Malik;G. Chandra;R. Vijayaraghavan
文献[1]报道了立方晶系化合物Pr_3Ru_4Ge_（13）在14.2K磁性有序。我们测量了Pr_3Ru_4Ge_（13）样品在2 ~ 300 K范围内的磁化率（χ）和电阻率（ρ），以及在4 ~ 20 K范围内的热容（Cp）。χ数据表明Curie-Weiss行为仅在高温下（T > 100 K），并且1/χ在低温下偏离线性。虽然χ，ρ和Cp数据显示在14 K的异常，非常小的量级的热容异常排除在Pr 3Ru 4Ge 13体磁有序。有效顺磁矩（μeff）为3.46 μB/Pr，接近于自由Pr ~（3+）离子的有效顺磁矩。热容量数据给出了100 mJ/Pr mol K2的Cp/T（T → 0 K）增强值，电阻率数据显示出在高温下不寻常的Kondo相关性。
It has been reported in the literature [1] that the cubic compound Pr3Ru4Ge13orders magnetically at 14.2 K. We have measured magnetic susceptibility (χ) and resistivity (ρ) from 2 to 300 K and the heat capacity (Cp) from 4 to 20 K of a sample of Pr3Ru4Ge13. The χ data indicate Curie-Weiss behaviour only at high temperatures (T > 100 K) and 1/χ deviates from linearity at low temperatures. Although the χ, ρ and Cpdata show an anomaly at 14 K, the very small magnitude of the heat capacity anomaly rules out bulk magnetic ordering in Pr3Ru4Ge13. The effective paramagnetic moment (μeff) is 3.46 μB/Pr, and is close to that of free Pr3+ion. The heat capacity data give an enhanced value of Cp/T (T → 0 K) of 100 mJ/Pr mol K2, and the resistivity data show an unusual Kondo-like dependence at high temperature.