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

doi:10.1088/1674-1056/ab8dab

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 T_N ～27.5 and 28.5 K, respectively. Their PCS conductance curves both exhibit a characteristic coherent double-peak-structure at temperatures below T_N, 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 T_N, 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
Accepted manuscript online:

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

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