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Phys. Rev. Lett. 88, 247601 (2002) [4 pages]

Angle-Resolved Photoemission Study of the MX-Chain Compound [Ni(chxn)2Br]Br2: Spin-Charge Separation in Hybridized d-p Chains

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Shin-ichi Fujimori, Akihiro Ino, and Testuo Okane
Synchrotron Radiation Research Center, Japan Atomic Energy Research Institute, SPring-8, Mikazuki, Hyogo 679-5148, Japan

Atsushi Fujimori
Synchrotron Radiation Research Center, Japan Atomic Energy Research Institute, SPring-8, Mikazuki, Hyogo 679-5148, Japan
and Department of Complexity Science, University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan

Kozo Okada
Department of Physics, Faculty of Science, Okayama University, Tsushima-naka, Okayama 700-8530, Japan

Toshio Manabe and Masahiro Yamashita
Department of Chemistry, Graduate School of Science, Tokyo Metropolitan University, Hachioji, Tokyo 192-0397, Japan

Hideo Kishida and Hiroshi Okamoto
Department of Advanced Materials Science, Graduate School of Frontier Science, University of Tokyo, Bunkyo-ku, Tokyo 113-8656, Japan

Received 4 July 2001; published 30 May 2002

We report on the results of angle-resolved photoemission experiments on a quasi-one-dimensional (1D) MX-chain compound [Ni(chxn)2Br]Br2, which shows a gigantic nonlinear optical effect. A “band” having about 500 meV energy dispersion is found in the first half of the Brillouin zone, but disappears at kb/π∼1/2. These spectral features are well reproduced by the d-p chain model with a small charge-transfer energy Δ compared with that of 1D Cu-O compounds. We propose that this smaller Δ is the origin of the absence of clear spin-charge separation in the photoemission spectra and the strong nonlinear optical effect.


©2002 The American Physical Society

URL: http://link.aps.org/doi/10.1103/PhysRevLett.88.247601
DOI: 10.1103/PhysRevLett.88.247601
PACS: 79.60.-i, 78.20.Bh

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