https://doi.org/10.1140/epjp/s13360-025-06975-w
Regular Article
Measuring conductivity from low-frequency susceptibility with a torsion pendulum
1
Faculty of Information Engineering, Quzhou College of Technology, 324000, Quzhou, People’s Republic of China
2
MOE Key Laboratory of TianQin Mission, TianQin Research Center for Gravitational Physics & School of Physics and Astronomy, Frontiers Science Center for TianQin, Gravitational Wave Research Center of CNSA, Sun Yat-sen University (Zhuhai Campus), 519082, Zhuhai, People’s Republic of China
3
School of Optoelectronic Engineering, Hubei University of Automotive Technology, 442002, Shiyan, People’s Republic of China
4
National Gravitation Laboratory, MOE Key Laboratory of Fundamental Physical Quantities Measurement and Hubei Key Laboratory of Gravitation and Quantum Physics, School of Physics, Huazhong University of Science and Technology, 430074, Wuhan, People’s Republic of China
a
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Received:
16
July
2025
Accepted:
17
October
2025
Published online:
11
November
2025
Abstract
An eddy current method for measuring conductivity 
of conducting material from low-frequency susceptibility 
measurements with a torsion pendulum is developed. Different from most other methods, this method does not rely on surface layer characteristics of samples since the low-frequency susceptibility is obtained from eddy currents distributed throughout the entire sample volume. We measure the conductivity of cm-scale conducting samples with a relative precision of 
, and the results agree with reference values within a 
deviation. The experimental results confirm that the susceptibility of conductors exhibits a linear frequency dependence at low frequencies. This method provides a new approach for precise measurement of the conductivity of block-shaped samples.
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© The Author(s), under exclusive licence to Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2025
Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
