HIGH-RESOLUTION ANGLE-RESOLVED PHOTOEMISSION STUDY OFη-MO4O11

H. Fujisawa, H. Kumigashira, T. Takahashi, R. Kurita and M. Koyano
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H. Fujisawa: Department of Physics, Tohoku University, Sendai 980-8578, Japan
H. Kumigashira: Department of Physics, Tohoku University, Sendai 980-8578, Japan
T. Takahashi: Department of Physics, Tohoku University, Sendai 980-8578, Japan
R. Kurita: School of Materials Science, Japan Advanced Institute of Science and Technology, Ishikawa 923-1292, Japan
M. Koyano: School of Materials Science, Japan Advanced Institute of Science and Technology, Ishikawa 923-1292, Japan

Surface Review and Letters (SRL), 2002, vol. 09, issue 02, 1041-1045

Abstract: We have performed high-resolution angle-resolved photoemission spectroscopy (ARPES) on a quasi two-dimensional (2D) conductorη-Mo4O11. The band dispersions nearEFand the Fermi-surface topology determined by ARPES show a qualitatively good agreement with the band-structure calculation, although the observed width of Mo 4d bands forming the Fermi surface is two-to-three times larger in the calculation. We have clearly identified two nesting vectors in the ARPES-derived Fermi surface, which show a good agreement with the CDW wave vectors obtained from X-ray diffraction experiments. The present ARPES results indicate that the CDW instability inη-Mo4O11is driven by "the hidden 1D Fermi-surface nesting" due to the quasi 1D chains in the crystal.

Date: 2002
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DOI: 10.1142/S0218625X02003317

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