A novel heavy-fermion state in CaCu3Ru4O12

Wataru Kobayashi; Ichiro Terasaki; Jun Ichi Takeya; Ichiro Tsukada; Yoichi Ando

doi:10.1143/JPSJ.73.2373

A novel heavy-fermion state in CaCu₃Ru₄O₁₂

Wataru Kobayashi^*, Ichiro Terasaki, Jun Ichi Takeya, Ichiro Tsukada, Yoichi Ando

^*Corresponding author for this work

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

108 Citations (Scopus)

Abstract

We have measured the susceptibility, specific heat, resistivity, and thermopower of CaCu₃Ti_4-xRu_xO₁₂ and CaCu_3-yMn_yRu₄O₁₂, and have found that CaCu₃Ru₄O₁₂ can be regarded as a heavy-fermion oxide in d-electron systems. The Kondo temperature is near 200 K, and the susceptibility (1.4 × 10^-3 cmu/ Cu mol) and the electron specific heat coefficient [28 mJ/(Cu mol K²)] are moderately enhanced. The resistivity is proportional to T² at low temperatures, and satisfies the Kadowaki-Woods relation. The heavy-fermion state comes from the interaction between the localized moment of Cu 3d and the conduction electron of Ru 4d. An insulator-metal transition occurs between x = 1.5 and 4 in CaCu₃-Ti_4-xRu_xO₁₂, which can be regarded as a transition from a magnetic insulator to a heavy-fermion metal.

Original language	English
Pages (from-to)	2373-2376
Number of pages	4
Journal	Journal of the Physical Society of Japan
Volume	73
Issue number	9
DOIs	https://doi.org/10.1143/JPSJ.73.2373
Publication status	Published - 2004 Sept

Keywords

Heavy fermion
Ordered perovskite
Transition-metal oxide

ASJC Scopus subject areas

Physics and Astronomy(all)

Access to Document

10.1143/JPSJ.73.2373

Cite this

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title = "A novel heavy-fermion state in CaCu3Ru4O12",

abstract = "We have measured the susceptibility, specific heat, resistivity, and thermopower of CaCu3Ti4-xRuxO12 and CaCu3-yMnyRu4O12, and have found that CaCu3Ru4O12 can be regarded as a heavy-fermion oxide in d-electron systems. The Kondo temperature is near 200 K, and the susceptibility (1.4 × 10-3 cmu/ Cu mol) and the electron specific heat coefficient [28 mJ/(Cu mol K2)] are moderately enhanced. The resistivity is proportional to T2 at low temperatures, and satisfies the Kadowaki-Woods relation. The heavy-fermion state comes from the interaction between the localized moment of Cu 3d and the conduction electron of Ru 4d. An insulator-metal transition occurs between x = 1.5 and 4 in CaCu3-Ti4-xRuxO12, which can be regarded as a transition from a magnetic insulator to a heavy-fermion metal.",

keywords = "Heavy fermion, Ordered perovskite, Transition-metal oxide",

author = "Wataru Kobayashi and Ichiro Terasaki and Takeya, {Jun Ichi} and Ichiro Tsukada and Yoichi Ando",

year = "2004",

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doi = "10.1143/JPSJ.73.2373",

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pages = "2373--2376",

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

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TY - JOUR

T1 - A novel heavy-fermion state in CaCu3Ru4O12

AU - Kobayashi, Wataru

AU - Terasaki, Ichiro

AU - Takeya, Jun Ichi

AU - Tsukada, Ichiro

AU - Ando, Yoichi

PY - 2004/9

Y1 - 2004/9

N2 - We have measured the susceptibility, specific heat, resistivity, and thermopower of CaCu3Ti4-xRuxO12 and CaCu3-yMnyRu4O12, and have found that CaCu3Ru4O12 can be regarded as a heavy-fermion oxide in d-electron systems. The Kondo temperature is near 200 K, and the susceptibility (1.4 × 10-3 cmu/ Cu mol) and the electron specific heat coefficient [28 mJ/(Cu mol K2)] are moderately enhanced. The resistivity is proportional to T2 at low temperatures, and satisfies the Kadowaki-Woods relation. The heavy-fermion state comes from the interaction between the localized moment of Cu 3d and the conduction electron of Ru 4d. An insulator-metal transition occurs between x = 1.5 and 4 in CaCu3-Ti4-xRuxO12, which can be regarded as a transition from a magnetic insulator to a heavy-fermion metal.

AB - We have measured the susceptibility, specific heat, resistivity, and thermopower of CaCu3Ti4-xRuxO12 and CaCu3-yMnyRu4O12, and have found that CaCu3Ru4O12 can be regarded as a heavy-fermion oxide in d-electron systems. The Kondo temperature is near 200 K, and the susceptibility (1.4 × 10-3 cmu/ Cu mol) and the electron specific heat coefficient [28 mJ/(Cu mol K2)] are moderately enhanced. The resistivity is proportional to T2 at low temperatures, and satisfies the Kadowaki-Woods relation. The heavy-fermion state comes from the interaction between the localized moment of Cu 3d and the conduction electron of Ru 4d. An insulator-metal transition occurs between x = 1.5 and 4 in CaCu3-Ti4-xRuxO12, which can be regarded as a transition from a magnetic insulator to a heavy-fermion metal.

KW - Heavy fermion

KW - Ordered perovskite

KW - Transition-metal oxide

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