Effect of Pressure on Intermediate Valence States in Cerium Kondo Compounds
来源期刊：JOURNAL OF RARE EARTHS2004年第1期
论文作者：Kagayama T Ohashi M Kaji S Lacerda A H Smith J L Oomi G
Key words：condensel physics; intermediate valence materials; cerium; rare earths;
Abstract: Electrical resistance, thermal expansion, lattice constants of the intermediate valence materials, α-Ce and CeBe13, were measured at high pressure. It is found that the Grüneisen parameters of Kondo temperature TK are 13 and 42 for α-Ce and CeBe13, respectively, and it decreases with increasing pressure. The magnetoresistance of α-Ce shows H2 dependence and its coefficient increases with pressure below 1 GPa, but becomes nearly constant above 1 GPa. The results indicate that the intermediate valence states are enhanced at high pressure indicating the enhancement of hybridization between the 4f electron and conduction band.
Kagayama T1，Ohashi M2，Kaji S2，Lacerda A H3，Smith J L3，Oomi G2
(1.Department of Mechanical Engineering and Materials Sciences, Kumamoto University, Kumamoto 860-8555, Japan;
2.Department of Physics, Kyushu University, Ropponmatsu, Fukuoka 810-8560, Japan;
3.Materials Science and Technology, Los Alamos National Laboratory, Los Alamos, NM 87545, USA)
Abstract:Electrical resistance, thermal expansion, lattice constants of the intermediate valence materials, α-Ce and CeBe13, were measured at high pressure. It is found that the Grüneisen parameters of Kondo temperature TK are 13 and 42 for α-Ce and CeBe13, respectively, and it decreases with increasing pressure. The magnetoresistance of α-Ce shows H2 dependence and its coefficient increases with pressure below 1 GPa, but becomes nearly constant above 1 GPa. The results indicate that the intermediate valence states are enhanced at high pressure indicating the enhancement of hybridization between the 4f electron and conduction band.
Key words:condensel physics; intermediate valence materials; cerium; rare earths;
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