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Regensburg 2004 – scientific programme

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TT: Tiefe Temperaturen

TT 18: Supraleitung: Tunneln, Josephson-Kontakte, SQUIDs

TT 18.4: Talk

Wednesday, March 10, 2004, 15:15–15:30, H20

Doping dependence of pseudogap and superconductivity in electron doped high-temperature-superconductors: results from tunneling spectroscopy — •B. Welter1, L. Alff1, Y. Krockenberger1, M. Naito2, and R. Gross11Walther-Meissner-Institut, Bayerische Akademie der Wissenschaften, Walther-Meissner-Str. 8, 85748 Garching, Germany — 2NTT Basic Research Laboratories, Atsugi, Japan

Studying the influence of doping on the characteristics of oxide superconductors is essential to both the understanding of the underlying physics and the development of new applications. Here, we report on tunneling spectroscopy measurements on grain boundary junctions of electron doped high-temperature superconductors La2−xCexCuO4, Pr2−xCexCuO4 and Nd2−xCexCuO4 with different Ce concentrations around optimal doping. We focus on the pronounced depletion in the density of states near EF observed in the normal state above Bc2 and its evolution with temperature, magnetic field and doping [1]. Considerations concerning the conservation of states rule even indicate a coexistence of this pseudogap regime and the superconducting state.[2]

[1] L. Alff, Y. Krockenberger, B. Welter, M. Schonecke, R. Gross, D. Manske and M. Naito, Nature 422, 698 (2003)

[2] B. Welter, Y. Krockenberger, L. Alff, M. Naito und R. Gross, to appear in Physica C

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