Magnetoconductivity due to Quantum Interference in Strongly Underdoped YBa2Cu3Ox
Abstract
We report magnetoconductivity measurements on YBa2Cu3Ox (x=6.25 and 6.36) single crystals. Our main result is that both the in-plane Deltasigmaab and out-of-plane Deltasigmac magnetoconductivities exhibit the field dependence characteristic of "two-dimensional" quantum interference in applied magnetic fields H parallel to the c-axis. Namely, Deltasigmac,ab are proportional to ln(H/H0), with Deltasigmac/sigmac substantially greater than Deltasigmaab/sigmaab. We interpret this result as evidence of interlayer incoherence in these crystals, so that the phase-coherent trajectories are mostly confined to one bilayer.
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