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TT: Tiefe Temperaturen
TT 20: Postersitzung IV (Mesoskopische Systeme, Supraleitung: Massivmaterialien, Bandleiter, Pinning, Vortexdynamik, Transporteigenschaften, Korngrenzen)
TT 20.31: Poster
Donnerstag, 27. März 2003, 14:30–19:00, P2c, P2d
A setup for ultra low noise voltage and magnetic field measurements — •Matthias Kemmler1, Eric Sassier1, Andreas Gerber2, Reinhold Kleiner1 und Dieter Koelle1 — 1Physikalisches Institut II, Festkoerperphysik, Universitaet Tuebingen, Germany — 2Forschungszentrum Juelich, Germany
We built a setup to perform noise measurements on thin films at variable temperature. It is equipped with a ultra-sensitive low Tc SQUID preamplifier which provides a typical resolution of 50 pV/SQRT(Hz). The heating is provided by a 1.5 W infrared laser diode which allows us to adjust the sample temperature with a resolution of about 1 mK in the range of 4.2 K to 100 K. A superconducting magnet allows to establish a field up to 5T. A second SQUID can be inductively coupled to the sample in order to measure magnetic noise. Our primary interest is to investigate the pinning mechanisms of vortices, e.g. by magnetic dots and antidot arrays in superconducting thin films.