Crossover in charge transport from one-dimensional copper-oxygen chains to two-dimensional ladders in (La,Y)y(Sr,Ca)14-yCu 24O41

T. Ivek, T. Vuletić, B. Korin-Hamzić, O. Milat, S. Tomić, B. Gorshunov, M. Dressel, J. Akimitsu, Y. Sugiyama, C. Hess, B. Büchner

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Abstract

The charge transport in the copper-oxygen chain/ladder layers of (La,Y) y (Sr,Ca) 14-y Cu24 O41 is investigated along two crystallographic directions in the temperature range from 50 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 nh =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 ladder planes.

Original languageEnglish
Article number205105
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume78
Issue number20
DOIs
Publication statusPublished - Nov 7 2008
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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    Ivek, T., Vuletić, T., Korin-Hamzić, B., Milat, O., Tomić, S., Gorshunov, B., Dressel, M., Akimitsu, J., Sugiyama, Y., Hess, C., & Büchner, B. (2008). Crossover in charge transport from one-dimensional copper-oxygen chains to two-dimensional ladders in (La,Y)y(Sr,Ca)14-yCu 24O41. Physical Review B - Condensed Matter and Materials Physics, 78(20), [205105]. https://doi.org/10.1103/PhysRevB.78.205105