Electronic states of CeT2X20 (T:transition metal, X=Zn and Cd)

Yusuke Hirose; Yoshitaka Suzuki; Fuminori Honda; Ruta Kulkarni; Arumugam Thamizhavel; Naomi Kawamura; Masaichiro Mizumaki; Ryohei Simokasa; Kojiro Mimura; Hiroshi Doto; Rikio Settai

doi:10.1063/1.5043138

Electronic states of CeT₂X₂₀ (T:transition metal, X=Zn and Cd)

Yusuke Hirose, Yoshitaka Suzuki, Fuminori Honda, Ruta Kulkarni, Arumugam Thamizhavel, Naomi Kawamura, Masaichiro Mizumaki, Ryohei Simokasa, Kojiro Mimura, Hiroshi Doto, Rikio Settai

Research output: Contribution to journal › Article › peer-review

Abstract

The electronic state of single crystals of CeIr₂(Zn_1-xCd_x)₂₀ and CePt₂Cd₂₀ has been studied by measuring the electrical resistivity ρ and specific heat C. We found that by substituting Zn with Cd, the lattice parameter expands, and the electronic specific heat coefficient γ and A coefficient, which is T²-term in ρ, are enhanced. Our experimental results reveal that the electronic state of the intermediate valence compound CeIr₂Zn₂₀ changes to a moderately heavy fermion state due to the negative chemical pressure. On the other hand, C and ρ of CePt₂Cd₂₀ show a clear jump and an abrupt change of slope below 0.3 K, respectively, due to a magnetic transition. The relation between the hybridization strength and Ce valence state has also been investigated by X-ray absorption experiment.

Original language	English
Article number	115017
Journal	AIP Advances
Volume	8
Issue number	11
DOIs	https://doi.org/10.1063/1.5043138
Publication status	Published - Nov 1 2018
Externally published	Yes

All Science Journal Classification (ASJC) codes

Physics and Astronomy(all)

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10.1063/1.5043138

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Electronic states of CeT₂X₂₀ (T:transition metal, X=Zn and Cd). / Hirose, Yusuke; Suzuki, Yoshitaka; Honda, Fuminori; Kulkarni, Ruta; Thamizhavel, Arumugam; Kawamura, Naomi; Mizumaki, Masaichiro; Simokasa, Ryohei; Mimura, Kojiro; Doto, Hiroshi; Settai, Rikio.

In: AIP Advances, Vol. 8, No. 11, 115017, 01.11.2018.

Research output: Contribution to journal › Article › peer-review

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abstract = "The electronic state of single crystals of CeIr2(Zn1-xCdx)20 and CePt2Cd20 has been studied by measuring the electrical resistivity ρ and specific heat C. We found that by substituting Zn with Cd, the lattice parameter expands, and the electronic specific heat coefficient γ and A coefficient, which is T2-term in ρ, are enhanced. Our experimental results reveal that the electronic state of the intermediate valence compound CeIr2Zn20 changes to a moderately heavy fermion state due to the negative chemical pressure. On the other hand, C and ρ of CePt2Cd20 show a clear jump and an abrupt change of slope below 0.3 K, respectively, due to a magnetic transition. The relation between the hybridization strength and Ce valence state has also been investigated by X-ray absorption experiment.",

author = "Yusuke Hirose and Yoshitaka Suzuki and Fuminori Honda and Ruta Kulkarni and Arumugam Thamizhavel and Naomi Kawamura and Masaichiro Mizumaki and Ryohei Simokasa and Kojiro Mimura and Hiroshi Doto and Rikio Settai",

note = "Funding Information: This work was carried out under the Joint-Research Program of the International Research Center for Nuclear Materials Science, Institute for Materials Research, Tohoku University. A.T. and R.K. thank Department of Science and Technology, Government of India for the financial assistance (Grant: DST/INT/JSPS/P-196/2015). This study was partially supported by Grants-in-Aid for Scientific Research (C) (Grant No. 15K05195) from the Ministry of Education, Culture, Sports, Science, and Technology (MEXT), Japan. The PFY-XAS experiments were performed at the BL39XU of SPring-8 with the approval of the Japan Synchrotron Radiation Research Institute (JASRI) (Proposal Nos. 2016B1961, 2017A1857, 2017B1066, 2018A1047). Publisher Copyright: {\textcopyright} 2018 Author(s).",

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AU - Kulkarni, Ruta

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AU - Mizumaki, Masaichiro

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AU - Mimura, Kojiro

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AU - Settai, Rikio

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