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Chin. Phys. B, 2020, Vol. 29(7): 077103    DOI: 10.1088/1674-1056/ab8dab
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES Prev   Next  

Point-contact spectroscopy on antiferromagnetic Kondo semiconductors CeT2Al10 (T=Ru and Os)

Jie Li(李洁)1, Li-Qiang Che(车利强)1, Tian Le(乐天)1, Jia-Hao Zhang(张佳浩)2, Pei-Jie Sun(孙培杰)2, Toshiro Takabatake1,3, Xin Lu(路欣)1,4,5
1 Center for Correlated Matter and Department of Physics, Zhejiang University, Hangzhou 310058, China;
2 Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
3 Department of Quantum Matter, ADSM, Hiroshima University, Higashi-Hiroshima, 739-8530, Japan;
4 Zhejiang Province Key Laboratory of Quantum Technology and Device, Zhejiang University, Hangzhou 310027, China;
5 Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China
Abstract  We have carried out point-contact spectroscopy (PCS) measurements on one family of antiferromagnetic Kondo semiconductor CeT2Al10 (T=Ru and Os) with a Néel temperature TN ~27.5 and 28.5 K, respectively. Their PCS conductance curves both exhibit a characteristic coherent double-peak-structure at temperatures below TN, signaling an AFM gap around the Fermi surface. The temperature dependent AFM gap 1 follows a Bardeen-Cooper-Schrieffer (BCS)-like mean-field behavior with a moderate gap anisotropy for PCS along different crystal axes. Another asymmetric gap-like feature is observed for both compounds at temperatures far below TN, which is consistent with opening of a new hybridization gap h inside the long-range ordered AFM state. Our results suggest a common itinerant nature of the anomalous AFM ordering, constraining theoretical models to explain the AFM origin in CeRu2Al10 and CeOs2Al10.
Keywords:  point-contact spectroscopy      Kondo semiconductor      antiferromagnetism      hybridization gap  
Received:  20 March 2020      Revised:  22 April 2020      Published:  05 July 2020
PACS:  71.27.+a (Strongly correlated electron systems; heavy fermions)  
  75.20.Hr (Local moment in compounds and alloys; Kondo effect, valence fluctuations, heavy fermions)  
Fund: Project supported by the National Key Research and Development Program of China (Grant Nos. 2017YFA0303101 and 2016FYA0300402), the National Natural Science Foundation of China (Grant Nos. 11674279, 11774404, and 11374257), the Zhejiang Provincial Natural Science Foundation of China (Grant No. LR18A04001), and the Japan Society for the Promotion of Science KAKENHI (Grant Nos. JP26400363, JP16H01076, and JP17K05545).
Corresponding Authors:  Xin Lu     E-mail:  xinluphy@zju.edu.cn

Cite this article: 

Jie Li(李洁), Li-Qiang Che(车利强), Tian Le(乐天), Jia-Hao Zhang(张佳浩), Pei-Jie Sun(孙培杰), Toshiro Takabatake, Xin Lu(路欣) Point-contact spectroscopy on antiferromagnetic Kondo semiconductors CeT2Al10 (T=Ru and Os) 2020 Chin. Phys. B 29 077103

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