Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2008-06-02
Physics
Condensed Matter
Strongly Correlated Electrons
8 pages, 7 figures, 1 table; submitted to Phys. Rev. B
Scientific paper
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.
Akimitsu Jun
Buechner Bernd
Dressel Martin
Gorshunov Boris
Hess Ch.
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