Angle-Resolved Photoemission Study of the <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi mathvariant="italic">MX</mi></math>-Chain Compound <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mo>[</mo><mi>Ni</mi><mo>(</mo><mi>chxn</mi><mrow><msub><mrow><mo>)</mo></mrow><mrow><mn>2</mn></mrow></msub></mrow><mi>Br</mi><mo>]</mo><mrow><msub><mrow><mi>Br</mi></mrow><mrow><mn>2</mn></mrow></msub></mrow></math>: Spin-Charge Separation in Hybridized <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi mathvariant="italic">d</mi><mi>−</mi><mi mathvariant="italic">p</mi></math> Chains

Shin-ichi Fujimori; Akihiro Ino; Testuo Okane; Atsushi Fujimori; Kozo Okada; Toshio Manabe; Masahiro Yamashita; Hideo Kishida; Hiroshi Okamoto

doi:10.1103/PhysRevLett.88.247601

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

Shin-ichi Fujimori, Akihiro Ino, Testuo Okane, Atsushi Fujimori, Kozo Okada, Toshio Manabe, Masahiro Yamashita, Hideo Kishida, and Hiroshi Okamoto

Phys. Rev. Lett. 88, 247601 – Published 30 May 2002

Abstract

We report on the results of angle-resolved photoemission experiments on a quasi-one-dimensional (1D) $MX$ -chain compound $[Ni (chxn)_{2} Br] {Br}_{2}$ , 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 $k b / π \sim 1 / 2$ . 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.

Received 4 July 2001

DOI:https://doi.org/10.1103/PhysRevLett.88.247601

Authors & Affiliations

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

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Vol. 88, Iss. 24 — 17 June 2002

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Physical Review Letters

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

Shin-ichi Fujimori, Akihiro Ino, Testuo Okane, Atsushi Fujimori, Kozo Okada, Toshio Manabe, Masahiro Yamashita, Hideo Kishida, and Hiroshi Okamoto

Phys. Rev. Lett. 88, 247601 – Published 30 May 2002

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