Anomalous behavior on specific heat and thermoelectric power in wide range of temperatures in CeNi2(Ge1-xSix)2

Michio Takeuchi; Mayumi Funane; Yosikazu Isikawa; Toshio Mizushima; Takashi Tayama; Tadashi Fukuhara; Tomohiko Kuwai

doi:10.1143/JPSJS.80SA.SA063

Anomalous behavior on specific heat and thermoelectric power in wide range of temperatures in CeNi₂(Ge_1-xSi_x)₂

Michio Takeuchi^*, Mayumi Funane, Yosikazu Isikawa, Toshio Mizushima, Takashi Tayama, Tadashi Fukuhara, Tomohiko Kuwai

^*Corresponding author for this work

Department of Physics

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

1 Scopus citations

Abstract

We present magnetic specific heat C_m and thermoelectric power S for CeNi₂(Ge_1-xSi_x)₂ (x = 0 ∼ 0.4) in a wide range of temperatures above 1 K to 300 K. Both C_m and S show a characteristic broad peak around 100 ∼ 150 K due to the Kondo effect with high Kondo temperature which is comparable to the crystalline electric field. On the other hand, C_m/T and S/T synchronously increase logarithmically at low temperatures on cooling for all x investigated. The anomalous temperature dependence both in C_m/T and S/T at low temperatures is interpreted as non-Fermi-liquid behavior due to the proximity to the quantum critical point for x ≤ 0.1, and due to Kondo disorder for x ≥ 0.3.

Original language	English
Article number	SA063
Journal	Journal of the Physical Society of Japan
Volume	80
Issue number	SUPPL. A
DOIs	https://doi.org/10.1143/JPSJS.80SA.SA063
State	Published - 2011/07

Keywords

Kondo disorder
Non Fermi liquid
Specific heat
Thermoelectric power

ASJC Scopus subject areas

General Physics and Astronomy

Access to Document

10.1143/JPSJS.80SA.SA063

Cite this

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title = "Anomalous behavior on specific heat and thermoelectric power in wide range of temperatures in CeNi2(Ge1-xSix)2",

abstract = "We present magnetic specific heat Cm and thermoelectric power S for CeNi2(Ge1-xSix)2 (x = 0 ∼ 0.4) in a wide range of temperatures above 1 K to 300 K. Both Cm and S show a characteristic broad peak around 100 ∼ 150 K due to the Kondo effect with high Kondo temperature which is comparable to the crystalline electric field. On the other hand, Cm/T and S/T synchronously increase logarithmically at low temperatures on cooling for all x investigated. The anomalous temperature dependence both in Cm/T and S/T at low temperatures is interpreted as non-Fermi-liquid behavior due to the proximity to the quantum critical point for x ≤ 0.1, and due to Kondo disorder for x ≥ 0.3.",

keywords = "Kondo disorder, Non Fermi liquid, Specific heat, Thermoelectric power",

author = "Michio Takeuchi and Mayumi Funane and Yosikazu Isikawa and Toshio Mizushima and Takashi Tayama and Tadashi Fukuhara and Tomohiko Kuwai",

year = "2011",

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doi = "10.1143/JPSJS.80SA.SA063",

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T1 - Anomalous behavior on specific heat and thermoelectric power in wide range of temperatures in CeNi2(Ge1-xSix)2

AU - Takeuchi, Michio

AU - Funane, Mayumi

AU - Isikawa, Yosikazu

AU - Mizushima, Toshio

AU - Tayama, Takashi

AU - Fukuhara, Tadashi

AU - Kuwai, Tomohiko

PY - 2011/7

Y1 - 2011/7

N2 - We present magnetic specific heat Cm and thermoelectric power S for CeNi2(Ge1-xSix)2 (x = 0 ∼ 0.4) in a wide range of temperatures above 1 K to 300 K. Both Cm and S show a characteristic broad peak around 100 ∼ 150 K due to the Kondo effect with high Kondo temperature which is comparable to the crystalline electric field. On the other hand, Cm/T and S/T synchronously increase logarithmically at low temperatures on cooling for all x investigated. The anomalous temperature dependence both in Cm/T and S/T at low temperatures is interpreted as non-Fermi-liquid behavior due to the proximity to the quantum critical point for x ≤ 0.1, and due to Kondo disorder for x ≥ 0.3.

AB - We present magnetic specific heat Cm and thermoelectric power S for CeNi2(Ge1-xSix)2 (x = 0 ∼ 0.4) in a wide range of temperatures above 1 K to 300 K. Both Cm and S show a characteristic broad peak around 100 ∼ 150 K due to the Kondo effect with high Kondo temperature which is comparable to the crystalline electric field. On the other hand, Cm/T and S/T synchronously increase logarithmically at low temperatures on cooling for all x investigated. The anomalous temperature dependence both in Cm/T and S/T at low temperatures is interpreted as non-Fermi-liquid behavior due to the proximity to the quantum critical point for x ≤ 0.1, and due to Kondo disorder for x ≥ 0.3.

KW - Kondo disorder

KW - Non Fermi liquid

KW - Specific heat

KW - Thermoelectric power

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