Effect of Co-Doping on the Magnetic Ground State of the Heavy-Fermion System CeCu2Ge2 Studied by Neutron Diffraction

IF 2.5 4区化学 Q2 CHEMISTRY, INORGANIC & NUCLEAR

Magnetochemistry Pub Date : 2023-04-26 DOI:10.3390/magnetochemistry9050115

R. Tripathi, D. Khalyavin, Shivani Sharma, D. Adroja, Z. Hossain

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Abstract

The antiferromagnetic phase transition of the heavy-fermion system Ce(Cu1−xCox)2Ge2 for x = 0.05 and 0.2, showing up in specific heat, magnetic susceptibility, and muon spin relaxation (μSR) data, has been further investigated. The neutron diffraction (ND) results show that Co-doping drastically reduces the moment size of Ce, without a qualitative change in the magnetic structure of the undoped compound CeCu2Ge2. An incommensurate magnetic propagation vector k = (0.2852, 0.2852, 0.4495) with a cycloidal magnetic structure with a Ce moment of 0.55 μB in the ab-plane has been observed for x = 0.05. Although for x = 0.2 the specific heat and magnetic susceptibility data reflect a phase transition with a broad peak and the muon relaxation rate shows a sharp peak at T = 0.9 K, our ND data dismiss the possibility of a long-range magnetic ordering down to 50 mK. The ND data, along with previously reported results for x = 0.2, are interpreted in terms of the reduced ordered state magnetic moments of the Ce3+ ion by Kondo screening and the presence of dynamical short-range magnetic correlations.

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中子衍射研究共掺杂对重费米子体系CeCu2Ge2磁性基态的影响

进一步研究了重费米子系统Ce（Cu1−xCox）2Ge2在x=0.05和0.2时的反铁磁相变，显示在比热、磁化率和μSR数据中。中子衍射（ND）结果表明，Co掺杂显著降低了Ce的矩大小，而未掺杂化合物CeCu2Ge2的磁性结构没有发生质的变化。在x=0.05时，在ab平面上观察到Ce矩为0.55μB的摆线磁结构的不公度磁传播矢量k=（0.2852，0.2852，0.4495）。尽管对于x=0.2，比热和磁化率数据反映了具有宽峰值的相变，μ介子弛豫率在T=0.9K处显示出尖锐的峰值，但我们的ND数据排除了低至50mK的长程磁有序的可能性。ND数据以及之前报道的x=0.2的结果，根据Kondo屏蔽的Ce3+离子的还原有序态磁矩和动态短程磁相关性的存在来解释。

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来源期刊

Magnetochemistry Chemistry-Chemistry (miscellaneous)

CiteScore

3.90

自引率

11.10%

发文量

145

审稿时长

11 weeks

期刊介绍： Magnetochemistry (ISSN 2312-7481) is a unique international, scientific open access journal on molecular magnetism, the relationship between chemical structure and magnetism and magnetic materials. Magnetochemistry publishes research articles, short communications and reviews. Our aim is to encourage scientists to publish their experimental and theoretical results in as much detail as possible. Therefore, there is no restriction on the length of the papers. The full experimental details must be provided so that the results can be reproduced.