CeAu2In4: A candidate of quasi-one-dimensional antiferromagnetic Kondo lattice

doi:10.1088/1674-1056/ac0a60

中国物理B ›› 2021, Vol. 30 ›› Issue (8): 87101-087101.doi: 10.1088/1674-1056/ac0a60

CeAu₂In₄: A candidate of quasi-one-dimensional antiferromagnetic Kondo lattice

Meng Lyu(吕孟)^1,2, Hengcan Zhao(赵恒灿)¹, Jiahao Zhang(张佳浩)^1,2, Zhen Wang(王振)^1,2, Shuai Zhang(张帅)^1,2, and Peijie Sun(孙培杰)^1,2,3,†

1 Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
2 University of Chinese Academy of Sciences, Beijing 100049, China;
3 Songshan Lake Materials Laboratory, Dongguan 523808, China

收稿日期:2021-04-28 修回日期:2021-06-07 接受日期:2021-06-11 出版日期:2021-07-16 发布日期:2021-07-23
通讯作者: Peijie Sun E-mail:pjsun@iphy.ac.cn
基金资助:
Project supported by the National Natural Science Foundation of China (Grant Nos. 11774404 and 52088101), the National Key R&D Program of China (Grant No. 2017YF A0303100), and the Chinese Academy of Sciences through the Strategic Priority Research Program (Grant No. XDB33000000).

CeAu₂In₄: A candidate of quasi-one-dimensional antiferromagnetic Kondo lattice

Meng Lyu(吕孟)^1,2, Hengcan Zhao(赵恒灿)¹, Jiahao Zhang(张佳浩)^1,2, Zhen Wang(王振)^1,2, Shuai Zhang(张帅)^1,2, and Peijie Sun(孙培杰)^1,2,3,†

1 Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
2 University of Chinese Academy of Sciences, Beijing 100049, China;
3 Songshan Lake Materials Laboratory, Dongguan 523808, China

Received:2021-04-28 Revised:2021-06-07 Accepted:2021-06-11 Online:2021-07-16 Published:2021-07-23
Contact: Peijie Sun E-mail:pjsun@iphy.ac.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos. 11774404 and 52088101), the National Key R&D Program of China (Grant No. 2017YF A0303100), and the Chinese Academy of Sciences through the Strategic Priority Research Program (Grant No. XDB33000000).

摘要/Abstract

摘要： Needle-like single crystals of CeAu₂In₄ have been grown from In flux and characterized as a new candidate of quasi-one-dimensional Kondo lattice compound by crystallographic, magnetic, transport, and specific-heat measurements down to very low temperatures. We observe an antiferromagnetic transition at T_N ≈ 0.9 K, a highly non-mean-field profile of the corresponding peak in specific heat, and a large Sommerfeld coefficient γ =369 mJ·mol^-1·K^-2. The Kondo temperature T_K is estimated to be 1.1 K, being low and comparable to T_N. While Fermi liquid behavior is observed deep into the magnetically ordered phase, the Kadowaki-Woods ratio is much reduced relative to the expected value for Ce compounds with Kramers doublet ground state. Markedly, this feature shares striking similarities to that of the prototypical quasi-one-dimensional compounds YbNi₄P₂ and CeRh₆Ge₄ with tunable ferromagnetic quantum critical point. Given the shortest Ce-Ce distance along the needle direction, CeAu₂In₄ appears to be an interesting model system for exploring antiferromagnetic quantum critical behaviors in a quasi-one-dimensional Kondo lattice with enhanced quantum fluctuations.

关键词: heavy fermion, quasi-one-dimensional, Kondo lattice, magnetic phase transition

Abstract: Needle-like single crystals of CeAu₂In₄ have been grown from In flux and characterized as a new candidate of quasi-one-dimensional Kondo lattice compound by crystallographic, magnetic, transport, and specific-heat measurements down to very low temperatures. We observe an antiferromagnetic transition at T_N ≈ 0.9 K, a highly non-mean-field profile of the corresponding peak in specific heat, and a large Sommerfeld coefficient γ =369 mJ·mol^-1·K^-2. The Kondo temperature T_K is estimated to be 1.1 K, being low and comparable to T_N. While Fermi liquid behavior is observed deep into the magnetically ordered phase, the Kadowaki-Woods ratio is much reduced relative to the expected value for Ce compounds with Kramers doublet ground state. Markedly, this feature shares striking similarities to that of the prototypical quasi-one-dimensional compounds YbNi₄P₂ and CeRh₆Ge₄ with tunable ferromagnetic quantum critical point. Given the shortest Ce-Ce distance along the needle direction, CeAu₂In₄ appears to be an interesting model system for exploring antiferromagnetic quantum critical behaviors in a quasi-one-dimensional Kondo lattice with enhanced quantum fluctuations.

Key words: heavy fermion, quasi-one-dimensional, Kondo lattice, magnetic phase transition

中图分类号: (Strongly correlated electron systems; heavy fermions)

71.27.+a

71.20.Eh (Rare earth metals and alloys) 72.15.-v (Electronic conduction in metals and alloys)

Meng Lyu(吕孟), Hengcan Zhao(赵恒灿), Jiahao Zhang(张佳浩), Zhen Wang(王振), Shuai Zhang(张帅), and Peijie Sun(孙培杰). CeAu₂In₄: A candidate of quasi-one-dimensional antiferromagnetic Kondo lattice[J]. 中国物理B, 2021, 30(8): 87101-087101.

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CeAu₂In₄: A candidate of quasi-one-dimensional antiferromagnetic Kondo lattice

CeAu₂In₄: A candidate of quasi-one-dimensional antiferromagnetic Kondo lattice

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