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首页> 外文期刊>Physical review >Muon spin relaxation and neutron scattering investigations of the noncentrosymmetric heavy-fermion antiferromagnet CeRhGe_3
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Muon spin relaxation and neutron scattering investigations of the noncentrosymmetric heavy-fermion antiferromagnet CeRhGe_3

机译：非中心对称重铁磁反铁磁体CeRhGe_3的μ自旋弛豫和中子散射研究

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The magnetic ground state of CeRhGe_3 has been investigated using magnetic susceptibility, heat capacity, neutron diffraction, muon spin relaxation (μSR), and inelastic neutron scattering (INS) techniques. Our μSR study clearly reveals the presence of two frequencies below T_(N2) = 7 K and three frequencies between 7 K and T_(n1) = 14.5 K, indicating long-range magnetic ordering of the Ce~(3+) moment. The temperature dependence of the highest frequency follows a mean-field order parameter. Our powder neutron diffraction study at 1.5 K reveals the presence of magnetic Bragg peaks, indexed by the propagation vector k = (0,0, 3/4) with the Ce~(3+) magnetic moment ~0.45(9) μ_b along the c axis. INS studies at 18 K (i.e., above T_(n1)) show the presence of two well-defined crystal-field (CEF) excitations at 7.5 and 18 meV. At 10 and 4.5 K, a very small increase has been observed in the CEF excitation energies. At 100 K, both CEF excitations broaden and a broad quasielastic component has also been observed. Further, the low-energy INS study reveals the presence of a nearly temperature-independent quasielastic linewidth between 16 and 60 K, which indicates a Kondo temperature T_k = 12.6(3) K. The presence of well-defined CEF excitations in CeRhGe_3 suggests local moment magnetism and may explain the absence of pressure-induced superconductivity. Analyzing the INS data based on a CEF model, we have evaluated the CEF ground-state wave functions and ground-state moment. The observed small value of the ordered moment along the c axis, deduced from the neutron diffraction data, contrasts with the ab-plane moment direction predicted by the single-ion CEF anisotropy and indicates the presence of two-ion anisotropic magnetic exchange interactions, which govern the direction of the moment.
机译：已经使用磁化率，热容，中子衍射，μ自旋弛豫（μSR）和非弹性中子散射（INS）技术研究了CeRhGe_3的磁性基态。我们的μSR研究清楚地表明，存在T_（N2）= 7 K以下的两个频率以及7 K和T_（n1）= 14.5 K之间的三个频率，表明Ce〜（3+）矩的远距离磁有序。最高频率的温度依赖性遵循平均场阶参数。我们在1.5 K下进行的粉末中子衍射研究表明存在磁布拉格峰，由传播矢量k =（0,0，3/4）随Ce〜（3+）磁矩〜0.45（9）μ_b索引c轴。在18 K（即T_（n1）以上）进行的INS研究表明，在7.5和18 meV处存在两个明确定义的晶体场（CEF）激发。在10和4.5 K时，观察到CEF激发能的增加很小。在100 K时，CEF激发都变宽，并且还观察到了广泛的准弹性分量。此外，低能INS研究表明存在与温度无关的准弹性线宽，介于16至60 K之间，这表明近藤温度T_k = 12.6（3）K。CeRhGe_3中存在明确定义的CEF激发表明存在局部磁矩可以解释压力感应超导的缺乏。分析基于CEF模型的INS数据，我们评估了CEF基态波函数和基态矩。由中子衍射数据推导出的沿c轴观察到的较小的有序矩值与单离子CEF各向异性预测的ab面矩方向相反，表明存在两离子各向异性磁交换相互作用，这表明控制时刻的方向。

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