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 ChainsReceived 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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