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The MagLab is funded by the National Science Foundation and the State of Florida.

Contactless Conductivity in DC Fields

The user can place small samples into an inductor (i.e., coil) of an LC tank circuit oscillating at a resonant frequency.

By measuring changes in the frequency, we can detect changes in the penetration depth of a superconductor, the susceptibility of a magnetic system or the surface conductivity of a metal. The absence of contacts connected to the sample allows this technique to produce less strain than conventional transport for fragile samples.


  • Frequency counter
  • Frequency generators
  • RF pre-amplifiers, mixers and splitters
  • Oscilloscope

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Images & Sample Data

Credit: National MagLab

Related Publications

R. L. Stillwell, et al, Pressure-driven Fermi surface reconstruction of chromium, Physical Review B 88 (2013) Read online.

S. Ghannadzadeh, et al, Evolution of magnetic interactions in a pressure-induced Jahn-Teller driven magnetic dimensionality switch, Physical Review B 87 (2013) Read online.

D. Graf, et al, Pressure dependence of the BaFe2As2 Fermi surface within the spin density wave state, Physical Review B 85 (2012) Read online.

C. Martin, et al, Evidence for the Fulde-Ferrell-Larkin-Ovchinnikov state in CeCoIn5 from penetration depth measurements, Physical Review B 71 (2005) Read online.

Staff Contact

David Graf

Last modified on 13 December 2023

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