Normal-state resistivity anisotropy in underdoped RBa_2Cu_3O_{6+x} crystals

Details Normal-state resistivity anisotropy in underdoped RBa_2Cu_3O_{6+x} crystals Normal-state resistivity anisotropy in underdoped RBa_2Cu_3O_{6+x} crystals

1998-11-07

arxiv.org/abs/cond-mat/9811104v1

Phys. Rev. Lett. 81, 5636 (1998)

Physics

Condensed Matter

Superconductivity

RevTex, 4 pages including 4 eps figures. To be published in Phys.Rev.Lett

Scientific paper

10.1103/PhysRevLett.81.5636

We have revealed new features in the out-of-plane resistivity rho_c of heavily underdoped RBa_2Cu_3O_{6+x} (R=Tm,Lu) single crystals, which give evidence for two distinct mechanisms contributing the c-axis transport. We have observed a crossover towards "metal-like" (d rho_c/d T > 0) behavior at the temperature T_m which quickly increases with decreasing doping. The "metal-like" conductivity contribution dominates at T < T_m and provides a saturation of the resistivity anisotropy, rho_c / rho_{ab}. The antiferromagnetic ordering is found to block this "metal-like" part of the c-axis conductivity and complete decoupling of CuO_2 planes, which may be the reason of superconductivity disappearance.

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