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
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 TN ≈ 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 TK is estimated to be 1.1 K, being low and comparable to TN. 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.
Fund: 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).
Corresponding Authors:
Peijie Sun
E-mail: pjsun@iphy.ac.cn
Cite this article:
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 2021 Chin. Phys. B 30 087101
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Electronic structure of heavy fermion system CePt2In7 from angle-resolved photoemission spectroscopy Bing Shen(沈兵), Li Yu(俞理), Kai Liu(刘凯), Shou-Peng Lyu(吕守鹏), Xiao-Wen Jia(贾小文), E D Bauer, J D Thompson, Yan Zhang(张艳), Chen-Lu Wang(王晨露), Cheng Hu(胡成), Ying Ding(丁颖), Xuan Sun(孙璇), Yong Hu(胡勇), Jing Liu(刘静), Qiang Gao(高强), Lin Zhao(赵林), Guo-Dong Liu(刘国东), Zu-Yan Xu(许祖彦), Chuang-Tian Chen(陈创天), Zhong-Yi Lu(卢仲毅), X J Zhou(周兴江). Chin. Phys. B, 2017, 26(7): 077401.
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