Photoemission Spectroscopy of Spinel-Type CuV_2S_4 Single Crystal(Condensed matter: electronic structure and electrical, magnetic, and optical properties)

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概要

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• We have performed photoemission spectroscopy studies of single-crystalline CuV_2S_4 using synchrotron radiation, in order to clarify the electronic structure changes across the charge density wave (CDW) transitions in a spinel type compound. Photo-energy-dependent studies show a peak structure just below the Fermi level (E_F), which undergoes resonant enhancement at an excitation energy hυ=54.5eV. This energy corresponds to the V 3p-3d threshold energy, thus suggesting that the density of states (DOS) at E_F is mainly composed of V 3d states. From temperature-dependent measurements, we observe a reduction in spectral DOS at and near E_F, leading to the formation of a pseudogap across CDW transition temperatures. The pseudogap energy scale of 〜0.05eV, identified at the top of the valence band, is significantly larger than the value expected from a BCS-like transition.

• 社団法人日本物理学会の論文
• 2008-11-15

著者

• TAGUCHI Munetaka

  RIKEN/SPring-8

• SHIMADA Kenya

  Hiroshima Synchrotron Radiation Center, Hiroshima University

• NAMATAME Hirofumi

  Hiroshima Synchrotron Radiation Center, Hiroshima University

• TANIGUCHI Masaki

  Hiroshima Synchrotron Radiation Center, Hiroshima University

• KOYAMA Keiichi

  High Field Laboratory for Superconducting Materials, Institute for Materials Research, Tohoku Univer

• WATANABE Kazuo

  High Field Laboratory for Superconducting Materials, Institute for Materials Research, Tohoku Univer

• 田口 政義

  日大生産工

• Namatame Hirofumi

  Department Of Physics Faculty Of Science University Of Tokyo

• Namatame Hirofumi

  Hiroshima Synchrotron Radiation Center Hiroshima Univ.

• Taguchi M.

  Riken/spring-8

• Shimada Kenya

  Hiroshima Univ. Hiroshima Jpn

• Shimada K.

  広大放セ

• Takata M

  Department Of Physics Division Of Material Science Nagoya University

• Shimada Kenya

  Hiroshima Synchrotron Radiation Center Hiroshima University

• Namatame Hirofumi

  Hiroshima Synchrotron Radiation Center Hiroshima Univ. Higashi-hiroshima 739-0046 Jpn

• Taniguchi Masaki

  Grad. Sch. Sci. Hiroshima Univ.:hsrc Hiroshima Univ.

• KOBAYASHI Keisuke

  Japan Synchrotron Radiation Research Institute/SPring-8

• Muro T

  Jasri Spring-8

• Koyama K

  Institute For Solid State Physics University Of Tokyo

• Taniguchi M

  Grad. Sch. Sci. Hiroshima Univ.:hsrc Hiroshima Univ.

• 島田 賢也

  広島大放セ

• Nagira Mirai

  Graduate School Of Science Hiroshima University

• Takata Masaki

  Jasri Spring-8

• Okada Hiroaki

  Department Of Chemistry Faculty Of Science Kyoto University

• OKADA Hironari

  High Field Laboratory for Superconducting Materials, Institute for Materials Research, Tohoku Univer

• Koyama K

  High Field Laboratory For Superconducting Materials Institute For Materials Research Tohoku Universi

• Koyama K

  Institute For Solid State Physics University:(present)institute Of Materials Research Tohoku Univers

• NAKATAKE Masashi

  Hiroshima Synchrotron Radiation Center, Hiroshima University

• Nakatake Masashi

  Hiroshima Synchrotron Radiation Center Hiroshima University

• Sugiyama K

  Graduate School Of Science Osaka University:center For Quantum Science And Technology Under Extreme

• Sugiyama K

  Department Of Physics Faculty Of Science Osaka University

• Okada Hironari

  High Field Laboratory For Superconducting Materials Institute For Materials Research Tohoku Universi

• Kindo Koichi

  Faculty Of Science Osaka University

• Koga K

  Department Of Superconductivity University Of Tokyo

• Koyama Keiichi

  High Field Lab. For Superconducting Materials Inst. For Materials Res. Tohoku Univ.

• Tsubota Masami

  Graduate School Of Advanced Sciences Of Matter Hiroshima University

• 田口 政義

  Riken/spring-8

• Taniguchi Masaki

  Hiroshima Synchrotron Radiation Center Hiroshima University

• Okada H

  Institute Of Advanced Energy Kyoto University

• Kajita K

  Department Of Physics Faculty Of Science Toho University

• Miyahara T

  Department Of Physics Tokyo Metropolitan University

• Watanabe Kazuo

  High Field Laboratory For Superconducting Materials Institute For Materials Research Tohoku Universi

• Koyama Keiichi

  Tohoku Univ. Sendai Jpn

• Watanabe Kazuo

  High Field Laboratory For Superconducting Materials Institute For Materials Research Tohoku Universi

• Watanabe Kazuo

  High Field Laboratory For Superconducting Materials Imr Tohoku University

• Koyama Keiichi

  High Field Laboratory For Superconducting Materials Institute For Materials Research Tohoku Universi

• Taniguchi Masaki

  Department Of Physical Sciences Graduate School Of Science Hiroshima University

• Koyama Keiichi

  Department of Physics, Faculty of Science, Toho University

• KOYAMA Keiichi

  High Field Laboratory for Superconducting Materials, Institute for Materials Research, Tohoku University

• WATANABE Kazuo

  High Field Lab. for Superconducting Materials, Institute for Materials Research, Tohoku University

• Namatame Hirofumi

  Hiroshima Synchrotron Radiation Center (HSRC), Hiroshima University, Higashihiroshima, Hiroshima 739-0046, Japan

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