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We show that the spin chain/ladder compound La_3Sr_3Ca_8Cu_24O_41 is aninsulator with hopping transport along the chains. In the temperature range 35- 280 K, DC conductivity sigma_{DC}(T) follows Mott's law of variable-rangehopping conduction; the frequency dependence has the form sigma(\nu, T) =\sigma_{DC}(T) + A(T)\nu^{s}, where s \approx 1. The conduction mechanismchanges from variable-range hopping to nearest-neighbor hopping around T_{c}=300 K. The chain array thus behaves like a one-dimensional disordered system.Disorder is due to random structural distortions of chains induced by irregularcoordination of the La/Sr/Ca ions.Comment: 4 pages, 3 figures, accepted for publication in PR

physical review. b, condensed matter

Variable-range hopping conductivity in the copper-oxygen chains of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">La</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Sr</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Ca</mml:mi></mml…

Variable-range hopping conductivity in the copper-oxygen chains ofLa3Sr3Ca