Regensburg 2004 – wissenschaftliches Programm
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TT: Tiefe Temperaturen
TT 1: Supraleitung: Herstellung und Charakterisierung
TT 1.1: Vortrag
Montag, 8. März 2004, 09:30–09:45, H20
Molecular beam epitaxy of electron doped high-temperature superconductors — •Yoshiharu Krockenberger1, Michio Naito1, Akio Tsukada1, Hideki Yamamoto1, Lambert Alff2, and Rudolf Gross2 — 1NTT Basic Research Laboratories, NTT Corporation, 3-1 Morinosato-Wakamiya, Atsugi-shi, Kanagawa 243-0198, Japan — 2Walter-Meissner-Institut, 85748 Garching, Germany
The field of high temperature superconductors has been investigated intensively. Among the studied materials, electron doped high temperature superconductors are a minority class and only two families are known: The T′ and infinite-layer compounds. The superconducting transition temperatures (Tc) are moderate even for optimum doping: 30 K for T′-compounds. Furthermore, sample preparation is very difficult. Nevertheless, n-type cuprates are of high interest and essential from the basic physics point of view, especially as to whether or not electron-hole symmetry holds in the high-Tc superconductors. As reported recently by Alff et al.[1] tunneling spectroscopy on thin film electron doped cuprates pinpointed detailed features of the pseudogap behavior. Therefore, we have investigated the growth and especially the reduction conditions (removal of apical oxygen) of T′-RE2−xCexCuO4+δ thin films for a wide doping variation.
[1] L. Alff et al., Nature 422, 698 (2003)