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The nature of the out-of-plane dissipation was investigated in underdoped$Y_{0.54}Pr_{0.46}Ba_{2}Cu_{3}O_{7-\delta}$ single crystals at temperaturesclose to the critical temperature. For this goal, temperature and angledependent out-of-plane resistivity measurements were carried out both below andabove the critical temperature. We found that the Ambegaokar-Halperinrelationship [V. Ambegaokar, and B. I. Halperin, Phys. Rev. Lett. \textbf{22},1364 (1969)] depicts very well the angular magnetoresistivity in theinvestigated range of field and temperature. The main finding is that thein-plane phase fluctuations decouple the layers above the critical temperatureand the charge transport is governed only by the quasiparticles. We also havecalculated the interlayer Josephson critical current density, which was foundto be much smaller than the one predicted by the theory of layeredsuperconductors. This discrepancy could be a result of the d-wave symmetry ofthe order parameter and/or of the non BCS temperature dependence of the c-axispenetration length.Comment: Will appear in PR

physical review. b, condensed matter and materials physics

High temperature mixed state<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>c</mml:mi></mml:math>-axis dissipation in low carrier density<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi mathvariant="normal">Y</mml:mi><mml:mn>0.54</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">Pr</mml:mi><mml:mn>0.46</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">Ba</mml:mi><mml:mn>2</mml:mn></mml:msub><…

High temperature mixed statec-axis dissipation in low carrier densityY0.54Pr0.46Ba2<…