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journal article·2018-11-01Open access

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

AIP Advances· Volume 8· Issue 11
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Source abstract

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.
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Research context

OpenAlex topics: Rare-earth and actinide compounds · Iron-based superconductors research · Inorganic Chemistry and Materials

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Department of Physics, Niigata University 1 , Niigata 950-218, Japan

Graduate School of Science and Technology, Niigata University 2 , Niigata 950-2181, Japan

Institute for Materials Research, Tohoku University 3 , Ibaraki 311-1313, Japan

Department of Condensed Matter Physics and Material Sciences, Tata Institute of Fundamental Research 4 , Mumbai 400-005, India

Japan Synchrotron Radiation Research Institute 5 , Hyogo 679-5198, Japan

Graduate School of Engineering, Osaka Prefecture University 6 , Osaka 599-8531, Japan

Funding

Department of Science and Technology, Government of India · the ministry of education, Culture, Sports, Science, and Technology, Japan

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