A novel heavy-fermion state in CaCu3Ru4O12

被引：110
作者：
Kobayashi, W [1 ]
Terasaki, I
Takeya, J
Tsukada, I
Ando, Y
机构：
[1] Waseda Univ, Dept Appl Phys, Tokyo 1698555, Japan
[2] Japan Sci & Technol Agcy, CREST, Tokyo 1080075, Japan
[3] Cent Res Inst Elect Power Ind, Tokyo 2018511, Japan
来源：
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 2004年 / 73卷 / 09期
关键词：
heavy fermion; transition-metal oxide; ordered perovskite;
D O I：
10.1143/JPSJ.73.2373
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
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 x 10(-3) emu/Cu mol) and the electron specific heat coefficient [28 mJ/(Cu mol K-2)] are moderately enhanced. The resistivity is proportional to T-2 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 CaCu3Ti4-xRuxO12, which can be regarded as a transition from a magnetic insulator to a heavy-fermion metal.
引用
收藏
页码：2373 / 2376
页数：4
相关论文
共 20 条
  • [1] SYNTHESIS AND CHARACTERIZATION OF SERIES OF ISOTYPE PEROVSKITE TITANATES OF (CACU3) (MN4)O12
    BOCHU, B
    DESCHIZEAUX, MN
    JOUBERT, JC
    COLLOMB, A
    CHENAVAS, J
    MAREZIO, M
    [J]. JOURNAL OF SOLID STATE CHEMISTRY, 1979, 29 (02) : 291 - 298
  • [2] EBBINGHAUS SG, 2002, SOLID STATE SCI, V4, P347
  • [3] First-principles study of the structure and lattice dielectric response of CaCu3Ti4O12 -: art. no. 214112
    He, LX
    Neaton, JB
    Cohen, MH
    Vanderbilt, D
    Homes, CC
    [J]. PHYSICAL REVIEW B, 2002, 65 (21) : 2141121 - 21411211
  • [4] Optical response of high-dielectric-constant perovskite-related oxide
    Homes, CC
    Vogt, T
    Shapiro, SM
    Wakimoto, S
    Ramirez, AP
    [J]. SCIENCE, 2001, 293 (5530) : 673 - 676
  • [5] High pressure synthesis, crystal structure and physical properties of a new Ni(II) perovskite BiNiO3
    Ishiwata, S
    Azuma, M
    Takano, M
    Nishibori, E
    Takata, M
    Sakata, M
    Kato, K
    [J]. JOURNAL OF MATERIALS CHEMISTRY, 2002, 12 (12) : 3733 - 3737
  • [6] Negative thermoelectric power induced by positive carriers in CaMn3-xCuxMn4O12
    Kobayashi, W
    Terasaki, I
    Mikami, M
    Funahashi, RJ
    [J]. JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 2004, 73 (03) : 523 - 525
  • [7] Universal charge transport of the Mn oxides in the high temperature limit
    Kobayashi, W
    Terasaki, I
    Mikami, M
    Funahashi, R
    Nomura, T
    Katsufuji, T
    [J]. JOURNAL OF APPLIED PHYSICS, 2004, 95 (11) : 6825 - 6827
  • [8] Unusual impurity effects on the dielectric properties of CaCu3-xMnxTi4O12
    Kobayashi, W
    Terasaki, I
    [J]. PHYSICA B-CONDENSED MATTER, 2003, 329 : 771 - 772
  • [9] Antiferromagnetism in CaCu3Ti4O12 studied by magnetic Raman spectroscopy
    Koitzsch, A
    Blumberg, G
    Gozar, A
    Dennis, B
    Ramirez, AP
    Trebst, S
    Wakimoto, S
    [J]. PHYSICAL REVIEW B, 2002, 65 (05): : 1 - 4
  • [10] LiV2O4: A heavy fermion transition metal oxide
    Kondo, S
    Johnston, DC
    Swenson, CA
    Borsa, F
    Mahajan, AV
    Miller, LL
    Gu, T
    Goldman, AI
    Maple, MB
    Gajewski, DA
    Freeman, EJ
    Dilley, NR
    Dickey, RP
    Merrin, J
    Kojima, K
    Luke, GM
    Uemura, YJ
    Chmaissem, O
    Jorgensen, JD
    [J]. PHYSICAL REVIEW LETTERS, 1997, 78 (19) : 3729 - 3732
12