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arXiv · 0806.0254

Crossover from one-dimensional copper-oxygen chains to two-dimensional ladders charge transport in (La,Y)y(Sr,Ca)14-yCu24O41

T. Ivek·T. Vuletic·B. Korin-Hamzic·O. Milat·S. Tomic·B. Gorshunov·M. Dressel·J. Akimitsu·Y. Sugiyama·C. Hess·B. Buechner
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Abstract

The charge transport in the copper-oxygen chain/ladder layers of (La,Y)y(Sr,Ca)14-yCu24O41 is investigated along two crystallographic directions in the temperature range from 50 K to 700 K and for doping levels from y ~= 6 (number of holes nh < 1) to y = 0 (number of holes nh = 6). A crossover from a one-dimensional hopping transport along the chains for y >= 3 to a quasi-two-dimensional charge conduction in the ladder planes for y <~ 2 is observed. This is attributed to a partial hole transfer from chains to ladders when the hole doping exceeds nh ~= 4 and approaches fully doped value n_h = 6. For y <~ 2 a weak dielectric relaxation at radio-frequencies and a microwave mode are detected, which might be recognized as signatures of a charge-density wave phase developed at short length scales in the ladders planes.

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T. Ivek, T. Vuletic, B. Korin-Hamzic, O. Milat, S. Tomic, B. Gorshunov, M. Dressel, J. Akimitsu, Y. Sugiyama, C. Hess, B. Buechner. 2008-09-08. Crossover from one-dimensional copper-oxygen chains to two-dimensional ladders charge transport in (La,Y)y(Sr,Ca)14-yCu24O41. https://arxiv.org/abs/0806.0254

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