High-sensitive superconducting magnetometry on a two-dimensional electron gas up to 10 Tesla

High-sensitive superconducting magnetometry on a two-dimensional electron gas up to 10 Tesla

We report on new magnetization studies on a two-dimensional electron system (2DES) revealing spin splitting of the Landau levels. For this, we have built a high-sensitive susceptometer consisting of a low-noise thin-film dc superconducting quantum interference device (SQUID) with a multiturn input c...

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Veröffentlicht in:Applied physics letters 1997-06, Vol.70 (24), p.3305-3307
Hauptverfasser: Meinel, Ines, Grundler, Dirk, Bargstädt-Franke, Silke, Heyn, Christian, Heitmann, Detlef, David, Bernd
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container_end_page 3307
container_issue 24
container_start_page 3305
container_title Applied physics letters
container_volume 70
creator Meinel, Ines
Grundler, Dirk
Bargstädt-Franke, Silke
Heyn, Christian
Heitmann, Detlef
David, Bernd
description We report on new magnetization studies on a two-dimensional electron system (2DES) revealing spin splitting of the Landau levels. For this, we have built a high-sensitive susceptometer consisting of a low-noise thin-film dc superconducting quantum interference device (SQUID) with a multiturn input coil and a wire-wound first-order gradiometer. The system noise level is only 40×10−6 Φ0/√(Hz) down to a frequency of a few Hz in unshielded environment. In background fields up to 10 T, the system exhibits significant low-frequency noise. At frequencies above 1 kHz, however, the SQUID sensitivity is barely affected and we have reached a value of about 10−14 J/T at 1 T and better than 10−13 J/T at 10 T. With this, we have studied the de Haas–van Alphen effect for a tunable 2DES starting from zero carrier density.
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title High-sensitive superconducting magnetometry on a two-dimensional electron gas up to 10 Tesla
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