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We report on the results of angle-resolved photoemission experiments on aquasi-one-dimensional $MX$-chain compound [Ni(chxn)$_2$Br]Br$_2$ (chxn =1$R$,2$R$-cyclohexanediamine), a one-dimensional Heisenberg system with $S=1/2$and $J \sim 3600$ K, which shows a gigantic non-linear optical effect. A "band"having about 500 meV energy dispersion is found in the first half of theBrillouin zone $(0\le kb/\pi <1/2)$, but disappears at $kb / \pi \sim 1/2$. Twodispersive features, expected from the spin-charge separation, as have beenobserved in other quasi-one-dimensional systems like Sr$_2$CuO$_3$, are notdetected. These characteristic features are well reproduced by the $d$-$p$chain model calculations with a small charge-transfer energy $\Delta$ comparedwith that of one-dimensional Cu-O based compounds. We propose that this smaller$\Delta$ is the origin of the absence of clear spin- and charge-separation inthe photoemission spectra and strong non-linear optical effect in[Ni(chxn)$_2$Br]Br$_2$.Comment: 4 pages, 3 figure

physical review letters

Angle-Resolved Photoemission Study of the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi mathvariant="italic">MX</mml:mi></mml:math>-Chain Compound<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mo>[</mml:mo><mml:mi>Ni</mml:mi><mml:mo>(</mml:mo><mml:mi>chxn</mml:mi><mml:mrow><mml:msub><mml:mrow><mml:mo>)</mml:mo></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mi>Br</mml:mi><mml:mo>]</mml:mo><mml:mrow><…

Angle-Resolved Photoemission Study of theMX-Chain Compound[Ni(chxn)2Br]<…