Physical review b vol:64 issue:21 pages:art. no.-214504
The key problem in the physics of high T-c cuprates [J. G. Bednorz and K. A. Muller, Z. Phys. B 64, 188 (1988)] is whether doping is inhomogeneous and holes are expelled into one-dimensional (ID) stripes. We demonstrate that the scattering mechanism defining the transport properties and the universal superlinear rho (T) behavior in underdoped YBa2Cu3Ox thin films [J. Vanacken, Physica B 294-295, 347 (2001)] is the same in spin ladders and underdoped cuprates. This implies that transport through conducting charge stripes in cuprates is fully controlled by the inelastic length coinciding with the magnetic correlation length in the ladders, i.e., holes in stripes behave very similarly to holes in spin ladders. The ID stripe transport model describes remarkably well the temperature dependences of the resistivity and the scaling behavior of magnetic and transport properties of underdoped cuprates (including transport in fields up to 50 T) using essentially one fitting parameter-the spin gap-decreasing with hole doping. In the framework of this model the hole-rich stripes are just spin ladders with an even number of chains, and therefore the pseudogap is simply the spin gap in spin ladders. The effective dimensionality is 2D at high temperature and ID in the pseudogap stripe regime. Disorder can lead to a pinning of stripes and their fragmentation, thus enforcing the interstripe hopping which effectively recovers the 2D transport regime at low temperatures.