Jürgen Betz

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A Nernst effect has been observed in a high temperature superconductor for the first time. Irradiating superconducting T1-Ba-Ca-CuO thin films by short pulses of a TEA-COs laser, a photovoltaic signal is detected perpendicular to a magnetic field applied parallel to the film surface. The signal is attributed to magnetic flux line depinning and flux line(More)
In the presence of a temperature gradient at a liquid-gas or liquid-liquid interface, thermocapillary or Marangoni convection develops. This convection is a special type of natural convection that was not paid much attention in heat transfer for a long time, although it is strong enough to drive liquids against the direction of buoyancy on Earth. In a(More)
1-Methoxynaphthalene (1) undergoes regioselective lithiation in position 2 (n-BuLi/TMEDA) or in position 8 (t-BuLi), respectively. The detected formation of a n-BuLi/1 complex (1:1 n-BuLi/1 mixture) appears to have only minor influence on the regioselectivity (both products are obtained). The exchange of hydrogen atom H2 by deuterium results in a remarkably(More)
By laser ablation with an excimer laser (308 nm) cuprate films from a Ca2Ba2CuaOz sintered bulk target were deposited onto SrTiO3 (100) single crystal substrates. Thallium was added by a diffusion process by simultaneously annealing of the cuprate films together with a sintered T12Ca2Ba2Cua01o bulk sample both enclosed in a covered metal box; this film(More)
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