Thermoelectric power at low temperatures in Ce(Ni1-xPd x)2Ge2 and CeCu5.9Au0.1 in the vicinity of antiferromagnetic quantum critical point

Tomohiko Kuwai; Toru Iwaki; Michio Takeuchi; Toshio Mizushima; Takashi Tayama; Yosikazu Isikawa; Tadashi Fukuhara

doi:10.1143/JPSJS.80SA.SA064

Thermoelectric power at low temperatures in Ce(Ni_1-xPd _x)₂Ge₂ and CeCu_5.9Au_0.1 in the vicinity of antiferromagnetic quantum critical point

Tomohiko Kuwai^*, Toru Iwaki, Michio Takeuchi, Toshio Mizushima, Takashi Tayama, Yosikazu Isikawa, Tadashi Fukuhara

^*Corresponding author for this work

Department of Physics

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

3 Scopus citations

Abstract

We present experimental results of thermoelectric power S and magnetic specific heat C_m down to 0.2 K for Ce(Ni_1-xPd _x)₂Ge₂ (x = 0 ∼ 0.12) and CeCu _5.9Au_0.1, being located in the vicinity of antiferromagnetic quantum critical point (AFM-QCP). S/T for Ce(Ni _1-xPd_x)₂Ge₂ shows complicated temperature dependence in contrast to a monotonic increase in the C _m/T with decreasing temperatures. The correlation parameter q, equivalent to the ratio S/C_m, decreases below 10 K attaining a considerably smaller value than unity at the lowest temperature for CeNi ₂Ge₂. On the other hand, the q for CeCu _5.9Au_0.1 deviates upward below 0.6 K from the saturation around 1 K, and reaches unity at the lowest temperature. The contrastive observation in the q between the both systems at low temperatures seems to reflect the difference in the AFM-QCP type.

Original language	English
Article number	SA064
Journal	Journal of the Physical Society of Japan
Volume	80
Issue number	SUPPL. A
DOIs	https://doi.org/10.1143/JPSJS.80SA.SA064
State	Published - 2011/07

Keywords

Non Fermi liquid
Quantum critical point
Specific heat
Thermoelectric power

ASJC Scopus subject areas

General Physics and Astronomy

Access to Document

10.1143/JPSJS.80SA.SA064

Cite this

@article{f990c324ea4347a685e855a4bc15b2d9,

title = "Thermoelectric power at low temperatures in Ce(Ni1-xPd x)2Ge2 and CeCu5.9Au0.1 in the vicinity of antiferromagnetic quantum critical point",

abstract = "We present experimental results of thermoelectric power S and magnetic specific heat Cm down to 0.2 K for Ce(Ni1-xPd x)2Ge2 (x = 0 ∼ 0.12) and CeCu 5.9Au0.1, being located in the vicinity of antiferromagnetic quantum critical point (AFM-QCP). S/T for Ce(Ni 1-xPdx)2Ge2 shows complicated temperature dependence in contrast to a monotonic increase in the C m/T with decreasing temperatures. The correlation parameter q, equivalent to the ratio S/Cm, decreases below 10 K attaining a considerably smaller value than unity at the lowest temperature for CeNi 2Ge2. On the other hand, the q for CeCu 5.9Au0.1 deviates upward below 0.6 K from the saturation around 1 K, and reaches unity at the lowest temperature. The contrastive observation in the q between the both systems at low temperatures seems to reflect the difference in the AFM-QCP type.",

keywords = "Non Fermi liquid, Quantum critical point, Specific heat, Thermoelectric power",

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

year = "2011",

month = jul,

doi = "10.1143/JPSJS.80SA.SA064",

language = "英語",

volume = "80",

journal = "Journal of the Physical Society of Japan",

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publisher = "The Physical Society of Japan",

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TY - JOUR

T1 - Thermoelectric power at low temperatures in Ce(Ni1-xPd x)2Ge2 and CeCu5.9Au0.1 in the vicinity of antiferromagnetic quantum critical point

AU - Kuwai, Tomohiko

AU - Iwaki, Toru

AU - Takeuchi, Michio

AU - Mizushima, Toshio

AU - Tayama, Takashi

AU - Isikawa, Yosikazu

AU - Fukuhara, Tadashi

PY - 2011/7

Y1 - 2011/7

N2 - We present experimental results of thermoelectric power S and magnetic specific heat Cm down to 0.2 K for Ce(Ni1-xPd x)2Ge2 (x = 0 ∼ 0.12) and CeCu 5.9Au0.1, being located in the vicinity of antiferromagnetic quantum critical point (AFM-QCP). S/T for Ce(Ni 1-xPdx)2Ge2 shows complicated temperature dependence in contrast to a monotonic increase in the C m/T with decreasing temperatures. The correlation parameter q, equivalent to the ratio S/Cm, decreases below 10 K attaining a considerably smaller value than unity at the lowest temperature for CeNi 2Ge2. On the other hand, the q for CeCu 5.9Au0.1 deviates upward below 0.6 K from the saturation around 1 K, and reaches unity at the lowest temperature. The contrastive observation in the q between the both systems at low temperatures seems to reflect the difference in the AFM-QCP type.

AB - We present experimental results of thermoelectric power S and magnetic specific heat Cm down to 0.2 K for Ce(Ni1-xPd x)2Ge2 (x = 0 ∼ 0.12) and CeCu 5.9Au0.1, being located in the vicinity of antiferromagnetic quantum critical point (AFM-QCP). S/T for Ce(Ni 1-xPdx)2Ge2 shows complicated temperature dependence in contrast to a monotonic increase in the C m/T with decreasing temperatures. The correlation parameter q, equivalent to the ratio S/Cm, decreases below 10 K attaining a considerably smaller value than unity at the lowest temperature for CeNi 2Ge2. On the other hand, the q for CeCu 5.9Au0.1 deviates upward below 0.6 K from the saturation around 1 K, and reaches unity at the lowest temperature. The contrastive observation in the q between the both systems at low temperatures seems to reflect the difference in the AFM-QCP type.

KW - Non Fermi liquid

KW - Quantum critical point

KW - Specific heat

KW - Thermoelectric power

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