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American Physical Society, Physical Review B (Condensed Matter), 13(61), p. 9162-9165, 2000

DOI: 10.1103/physrevb.61.9162

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c-axis tunneling inYBa2Cu3O7−δ/PrBa2Cu3O

Journal article published in 2000 by J. C. Martínez, A. Schattke, M. Jourdan ORCID, G. Jakob, H. Adrian
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This paper is available in a repository.

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Abstract

In this work we report c-axis conductance measurements done on a superlattice based on a stack of two layers of YBa2Cu3O7-δ and seven layers of PrBa2Cu3O7-δ (2:7). We find that these quasi-two-dimensional structures show no clear superconducting coupling along the c axis. Instead, we observe tunneling with a gap of Δc=5.0±0.5 meV for the direction perpendicular to the superconducting planes. The conductance spectrum show well defined quasiperiodic structures which are attributed to the superlattice structure. From this data we deduce a low-temperature c-axis coherence length of ξc=0.24±0.03 nm.