Thermal expansion of structure-disordered heavy-fermion Ce alloys

Yusuke Amakai; Shigeyuki Murayama; Yoshihisa Obi; Hideaki Takano; Naoki Momono; Koki Takanashi

doi:10.1143/JPSJS.80SA.SA057

Thermal expansion of structure-disordered heavy-fermion Ce alloys

Yusuke Amakai, Shigeyuki Murayama, Yoshihisa Obi, Hideaki Takano, Naoki Momono, Koki Takanashi

Materials Development Division

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

2 Citations (Scopus)

Abstract

We have measured the thermal expansion on structure-disordered (a-)Ce _xY_80-xMn₂₀ alloys. The linear thermal expansion ΔL/L for all the samples shows a monotonic increase with increasing temperature. In the thermal expansion coefficient α for x ≥ 51, anomalous deviation from a conventional Debye curve was observed at low temperature and increased with increasing Ce concentration. The magnetic contribution α_4f estimated from the equation α(a-Ce _xY_80-xMn₂₀) - α(a-Y₈₀Mn ₂₀) increases with increasing the Ce concentration and exhibits a maximum in the low temperature for x ≥ 51. These behaviors in α_4f are interpreted as the formation of the heavy fermion state in the structure-disordered alloys.

Original language	English
Article number	SA057
Journal	journal of the physical society of japan
Volume	80
Issue number	SUPPL. A
DOIs	https://doi.org/10.1143/JPSJS.80SA.SA057
Publication status	Published - 2011 Jul

Keywords

(Ce,Y)-Mn
Dense Kondo
Heavy fermion
Structure-disordered alloy
Thermal expansion

ASJC Scopus subject areas

Physics and Astronomy(all)

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10.1143/JPSJS.80SA.SA057

Cite this

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title = "Thermal expansion of structure-disordered heavy-fermion Ce alloys",

abstract = "We have measured the thermal expansion on structure-disordered (a-)Ce xY80-xMn20 alloys. The linear thermal expansion ΔL/L for all the samples shows a monotonic increase with increasing temperature. In the thermal expansion coefficient α for x ≥ 51, anomalous deviation from a conventional Debye curve was observed at low temperature and increased with increasing Ce concentration. The magnetic contribution α4f estimated from the equation α(a-Ce xY80-xMn20) - α(a-Y80Mn 20) increases with increasing the Ce concentration and exhibits a maximum in the low temperature for x ≥ 51. These behaviors in α4f are interpreted as the formation of the heavy fermion state in the structure-disordered alloys.",

keywords = "(Ce,Y)-Mn, Dense Kondo, Heavy fermion, Structure-disordered alloy, Thermal expansion",

author = "Yusuke Amakai and Shigeyuki Murayama and Yoshihisa Obi and Hideaki Takano and Naoki Momono and Koki Takanashi",

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T1 - Thermal expansion of structure-disordered heavy-fermion Ce alloys

AU - Amakai, Yusuke

AU - Murayama, Shigeyuki

AU - Obi, Yoshihisa

AU - Takano, Hideaki

AU - Momono, Naoki

AU - Takanashi, Koki

PY - 2011/7

Y1 - 2011/7

N2 - We have measured the thermal expansion on structure-disordered (a-)Ce xY80-xMn20 alloys. The linear thermal expansion ΔL/L for all the samples shows a monotonic increase with increasing temperature. In the thermal expansion coefficient α for x ≥ 51, anomalous deviation from a conventional Debye curve was observed at low temperature and increased with increasing Ce concentration. The magnetic contribution α4f estimated from the equation α(a-Ce xY80-xMn20) - α(a-Y80Mn 20) increases with increasing the Ce concentration and exhibits a maximum in the low temperature for x ≥ 51. These behaviors in α4f are interpreted as the formation of the heavy fermion state in the structure-disordered alloys.

AB - We have measured the thermal expansion on structure-disordered (a-)Ce xY80-xMn20 alloys. The linear thermal expansion ΔL/L for all the samples shows a monotonic increase with increasing temperature. In the thermal expansion coefficient α for x ≥ 51, anomalous deviation from a conventional Debye curve was observed at low temperature and increased with increasing Ce concentration. The magnetic contribution α4f estimated from the equation α(a-Ce xY80-xMn20) - α(a-Y80Mn 20) increases with increasing the Ce concentration and exhibits a maximum in the low temperature for x ≥ 51. These behaviors in α4f are interpreted as the formation of the heavy fermion state in the structure-disordered alloys.

KW - (Ce,Y)-Mn

KW - Dense Kondo

KW - Heavy fermion

KW - Structure-disordered alloy

KW - Thermal expansion

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Thermal expansion of structure-disordered heavy-fermion Ce alloys

Abstract

Keywords

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