Regensburg 1998 – wissenschaftliches Programm

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TT: Tiefe Temperaturen

TT 15: Postersitzung II: Massive HTSL (1-12), Supraleitung: Anwendungen (13-34), Josephsonkontakte und Kryoelektronik (35-75), Elektronenstruktur und Phononen in HTSL (76-79), Schwere Fermionen, Kondo-Systeme (80-99)

TT 15.24: Poster

Mittwoch, 25. März 1998, 15:00–18:30, D

High Resolution Thermometry utilizing the London Penetration Depth of Superconductors — •J. Engelhardt¹ and F.M. Gasparini² — ¹current address: Max-Planck-Institut für Festkörperforschung, Heisenbergstraße 1, D-70569 Stuttgart — ²Dept. of Physics, State University of New York at Buffalo, 14260 Buffalo NY, USA

The magnetic field penetration depth of a superconductor varies with temperature. This dependence is described by a formula which holds quite well near the transition temperature. The self inductance of a coil surrounding a superconducting core can be made to be strongly temperature dependent. The concept of this type of high resolution thermometer has been proved. Thin film design of the coil permits miniaturization and high sensitivity over a wider range. It is proposed, to set up a penetration depth thermometer for an application near the lambda point of He II. We present sensing elements with using superconducting coils wound on bulk indium or indium films. Tests have been performed in a thermally controlled environment. The self inductance was monitored with an AC inductance bridge system. The results lead to an optimized design of a penetration depth thermometer with nanokelvin resolution.