Electrical Resistivity Anisotropy from Self-Organized One Dimensionality in High-Temperature Superconductors
We investigate the manifestation of stripes in the in-plane resistivity anisotropy in untwinned single crystals of La2-xSrxCuO4 ( x = 0.02-0.04) and YBa2Cu3Oy ( y = 6.35-7.0). It is found that both systems show strongly temperature-dependent in-plane anisotropy in the lightly hole-doped region and that the anisotropy in YBa2Cu3Oy grows with decreasing y below ~6.60 despite the decreasing orthorhombicity, which gives most direct evidence that electrons self-organize into a macroscopically anisotropic state. The transport is found to be easier along the direction of the spin stripes already reported, demonstrating that the stripes are intrinsically conducting in cuprates.
Physical Review Letters
- Pub Date:
- April 2002
- Condensed Matter - Superconductivity;
- Condensed Matter - Strongly Correlated Electrons
- 5 pages, 4 figures (including one color figure), final version accepted for publication in Phys. Rev. Lett