Kondo behaviour in Ce-Si amorphous alloys

T. Hihara; K. Sumiyama; H. Yamauchi; Y. Homma; T. Suzuki; K. Suzuki

doi:10.1088/0953-8984/5/44/028

Kondo behaviour in Ce-Si amorphous alloys

T. Hihara, K. Sumiyama, H. Yamauchi, Y. Homma, T. Suzuki, K. Suzuki

Materials Processing and Characterization Division

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

13 Citations (Scopus)

Abstract

Incoherent Kondo effects have been observed in Ce_xSi _100-x (x = 18, 53, 66 and 87) amorphous alloys produced by sputtering. They show large enhancement of the electronic specific-heat coefficient at low temperatures, being classified as heavy-fermion systems. The magnetic susceptibility reveals a Curie-Weiss law at T>100 K with an effective Bohr magneton number of above 2.45 mu _B. However, the electrical resistivity is large, revealing a Kondo-type logarithmic temperature dependence. The atomic randomness prohibits the coherent Kondo state and the formation of a magnetically ordered state in the Ce-Si amorphous alloys.

Original language	English
Article number	028
Pages (from-to)	8425-8436
Number of pages	12
Journal	Journal of Physics: Condensed Matter
Volume	5
Issue number	44
DOIs	https://doi.org/10.1088/0953-8984/5/44/028
Publication status	Published - 1993 Dec 1

ASJC Scopus subject areas

Materials Science(all)
Condensed Matter Physics

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AU - Hihara, T.

AU - Sumiyama, K.

AU - Yamauchi, H.

AU - Homma, Y.

AU - Suzuki, T.

AU - Suzuki, K.

PY - 1993/12/1

Y1 - 1993/12/1

N2 - Incoherent Kondo effects have been observed in CexSi 100-x (x = 18, 53, 66 and 87) amorphous alloys produced by sputtering. They show large enhancement of the electronic specific-heat coefficient at low temperatures, being classified as heavy-fermion systems. The magnetic susceptibility reveals a Curie-Weiss law at T>100 K with an effective Bohr magneton number of above 2.45 mu B. However, the electrical resistivity is large, revealing a Kondo-type logarithmic temperature dependence. The atomic randomness prohibits the coherent Kondo state and the formation of a magnetically ordered state in the Ce-Si amorphous alloys.

AB - Incoherent Kondo effects have been observed in CexSi 100-x (x = 18, 53, 66 and 87) amorphous alloys produced by sputtering. They show large enhancement of the electronic specific-heat coefficient at low temperatures, being classified as heavy-fermion systems. The magnetic susceptibility reveals a Curie-Weiss law at T>100 K with an effective Bohr magneton number of above 2.45 mu B. However, the electrical resistivity is large, revealing a Kondo-type logarithmic temperature dependence. The atomic randomness prohibits the coherent Kondo state and the formation of a magnetically ordered state in the Ce-Si amorphous alloys.

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Kondo behaviour in Ce-Si amorphous alloys

Abstract

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