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Berlin 2008 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 15: Superconductivity: Poster Session

TT 15.32: Poster

Tuesday, February 26, 2008, 14:00–18:00, Poster B

Tunneling transport properties in (La,Sr)2CuO4 grain boundary Josephson junctions — •Andreas Stöhr1, Michael Wagenknecht1, Dieter Koelle1, Reinhold Kleiner1, Gennady Logvenov2, and Ivan Bozovic21Physikalisches Institut - Experimentalphysik II and Center for Collective Quantum Phenomena, Universität Tübingen, Auf der Morgenstelle 14, D-72076 Tübingen, Germany — 2Brookhaven National Laboratory, Upton, NY, U.S.A.

We investigate tunneling transport properties in thin film grain boundary Josephson junctions (GBJ‘s) of epitaxially grown (La,Sr)2CuO4 (LSCO) on bicrystal substrates. These optimally doped LSCO films were made by molecular beam epitaxy producing a very smooth film at the grain boundary. Measurements of the critical current Ic at low magnetic fields B (mT range) are used to characterize the quality of the junctions. Deviations from the ideal Ic(B) pattern enable us to indicate the homogeneity of the GBJ. Measurements of the differential conductance in high magnetic fields (T range) are used to investigate quasiparticle tunneling across the grain boundary. Results are compared to theoretical predictions.

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