ac susceptometer; superconductivity; magnetic measurements
Abstract :
[en] The main purpose of this work was to design, develop and construct a simple, low-cost ac
susceptometer to measure large, bulk superconducting samples (up to 32 mm in diameter) in
the temperature range 78–120 K. The design incorporates a double heating system that enables
a high heating rate (25 K h−1) while maintaining a small temperature gradient (<0.2 K) across
the sample. The apparatus can be calibrated precisely using a copper coil connected in series
with the primary coil. The system has been used successfully to measure the temperature
dependence of the ac magnetic properties of entire RE–Ba–Cu–O [(RE)BCO] bulk
superconducting domains. A typical ac susceptibility measurement run from 78 K to 95 K
takes about 2 h, with excellent temperature resolution (temperature step ∼ 4 mK) around the
critical temperature, in particular.
Research center :
SUPRATECS - Services Universitaires pour la Recherche et les Applications Technologiques de Matériaux Électro-Céramiques, Composites, Supraconducteurs - ULiège
Disciplines :
Electrical & electronics engineering
Author, co-author :
Laurent, Philippe ; Université de Liège - ULiège > Dép. d'électric., électron. et informat. (Inst.Montefiore) > Capteurs et systèmes de mesures électriques
Fagnard, Jean-François ; Université de Liège - ULiège > Dép. d'électric., électron. et informat. (Inst.Montefiore) > Capteurs et systèmes de mesures électriques
Vanderheyden, Benoît ; Université de Liège - ULiège > Dép. d'électric., électron. et informat. (Inst.Montefiore) > Electronique et microsystèmes
Hari Babu, N.; University of Cambridge > IRC in Superconductivity
Cardwell, D. A.; University of Cambridge > IRC in Superconductivity
Ausloos, Marcel ; Université de Liège - ULiège > Département de physique > Physique statistique appliquée et des matériaux - S.U.P.R.A.S.
Vanderbemden, Philippe ; Université de Liège - ULiège > Dép. d'électric., électron. et informat. (Inst.Montefiore) > Capteurs et systèmes de mesures électriques
Language :
English
Title :
An ac susceptometer for the characterization of large, bulk superconducting samples
F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE] EPSRC - Engineering and Physical Sciences Research Council [GB] RMA - Royal Military Academy [BE]
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