Bulk-sensitive photoemission study of A Cu3 Ru4 O12 (A=Ca, Na, and La) with heavy-fermion behavior

Takaaki Sudayama, Yuki Wakisaka, Kou Takubo, Takashi Mizokawa, Wataru Kobayashi, Ichiro Terasaki, Soutarou Tanaka, Yoshiteru Maeno, Masashi Arita, Hirofumi Namatame, Masaki Taniguchi

    Research output: Contribution to journalArticle

    13 Citations (Scopus)

    Abstract

    We have studied the d -electron heavy-fermion states in A Cu3 Ru4 O12 (A=Ca, Na, and La) using x-ray photoemission spectroscopy and high-resolution photoemission spectroscopy at bulk-sensitive photon energy (7 eV). The bulk-sensitive photoemission measurements for A=Ca, Na, and La show that a resonancelike structure within a pseudogap commonly evolves in the low-temperature range where the Kadowaki-Woods relation holds. The origin of the resonancelike peak and the heavy-fermion behavior is basically attributed to the hybridization between the Cu3d and Ru4d orbitals. The A -site substitution controls the filling of the Cu3d and Ru 4d hybridized bands. Interestingly, while the resonancelike peak position roughly follows the rigid-band shift for A=Na and La, the resonancelike peak deviating from the rigid-band behavior is located just at the Fermi level as expected in a Kondo system. The difference in the resonancelike peak near the Fermi level is correlated with that in the Cu2p core-level spectra.

    Original languageEnglish
    Article number075113
    JournalPhysical Review B - Condensed Matter and Materials Physics
    Volume80
    Issue number7
    DOIs
    Publication statusPublished - 2009 Aug 14

    Fingerprint

    Fermions
    Photoemission
    Photoelectron spectroscopy
    Fermi level
    photoelectric emission
    fermions
    Core levels
    Wood
    Substitution reactions
    Photons
    X rays
    Electrons
    spectroscopy
    substitutes
    orbitals
    Temperature
    shift
    high resolution
    photons
    electrons

    ASJC Scopus subject areas

    • Condensed Matter Physics
    • Electronic, Optical and Magnetic Materials

    Cite this

    Bulk-sensitive photoemission study of A Cu3 Ru4 O12 (A=Ca, Na, and La) with heavy-fermion behavior. / Sudayama, Takaaki; Wakisaka, Yuki; Takubo, Kou; Mizokawa, Takashi; Kobayashi, Wataru; Terasaki, Ichiro; Tanaka, Soutarou; Maeno, Yoshiteru; Arita, Masashi; Namatame, Hirofumi; Taniguchi, Masaki.

    In: Physical Review B - Condensed Matter and Materials Physics, Vol. 80, No. 7, 075113, 14.08.2009.

    Research output: Contribution to journalArticle

    Sudayama, T, Wakisaka, Y, Takubo, K, Mizokawa, T, Kobayashi, W, Terasaki, I, Tanaka, S, Maeno, Y, Arita, M, Namatame, H & Taniguchi, M 2009, 'Bulk-sensitive photoemission study of A Cu3 Ru4 O12 (A=Ca, Na, and La) with heavy-fermion behavior', Physical Review B - Condensed Matter and Materials Physics, vol. 80, no. 7, 075113. https://doi.org/10.1103/PhysRevB.80.075113
    Sudayama, Takaaki ; Wakisaka, Yuki ; Takubo, Kou ; Mizokawa, Takashi ; Kobayashi, Wataru ; Terasaki, Ichiro ; Tanaka, Soutarou ; Maeno, Yoshiteru ; Arita, Masashi ; Namatame, Hirofumi ; Taniguchi, Masaki. / Bulk-sensitive photoemission study of A Cu3 Ru4 O12 (A=Ca, Na, and La) with heavy-fermion behavior. In: Physical Review B - Condensed Matter and Materials Physics. 2009 ; Vol. 80, No. 7.
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    AU - Namatame, Hirofumi

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