Inhaltszusammenfassung

In this work we report c-axis conductance measurements done on a superlattice based on a stack of two layers of YBa2Cu3O7-? and seven layers of PrBa2Cu3O7-? (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 ?c=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 superl...In this work we report c-axis conductance measurements done on a superlattice based on a stack of two layers of YBa2Cu3O7-? and seven layers of PrBa2Cu3O7-? (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 ?c=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 ?c=0.24±0.03 nm. » weiterlesen» einklappen

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Klassifikation

DFG Fachgebiet:
Physik der kondensierten Materie

DDC Sachgruppe:
Physik