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The title quasi-1D copper oxides (0=< x =<0.4) were investigated by neutrondiffraction and magnetic susceptibility studies. Polyhedral CuO4 units in thecompounds were found to comprise linear-chains at inter-chain distance ofapproximately 10 A. The parent chain compound (x = 0), however, shows lessanisotropic magnetic behavior above 2 K, although it is of substantiallyantiferromagnetic (mu_{eff}= 1.85 mu_{B} and Theta_{W} = -46.4 K) spin-chainsystem. A magnetic cusp gradually appears at about 100 K in T vs chi with theBi substitution. The cusp (x = 0.4) is fairly characterized by and thereforesuggests the spin gap nature at Delta/k_{B} ~ 80 K. The chain compounds holdelectrically insulating in the composition range.Comment: To be published in PR

physical review. b, condensed matter

Crystal structure and magnetism of the linear-chain copper oxides<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Sr</mml:mi></mml:mrow><mml:mrow><mml:mn>5</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Pb</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn><mml:mi>−</mml:mi><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi …

Crystal structure and magnetism of the linear-chain copper oxidesSr5Pb3−x