AC Electrical Conductivity in DC Fields

The DC Field Facility has the capability to measure low resistances samples in continuous fields up to 45 T. Most of the standard laboratory electronics that users have experience with for lower field measurements are available at the MagLab, including lock-in amplifiers, current sources and pre-amplifiers.

Several magnets that are part of the user program — SCM1 and SCM2, Cells 9, 12 and 15 — have cryogenic systems installed with probes that conveniently allow for “plug and play” measurements using 8- and 16-pin connectors. Many users choose to mount samples on these platforms at their home institutions so they are prepared when they arrive at the MagLab. The direction of the applied field of the magnets can be reversed for Hall effect measurements and rotation probes are available for determining the angular dependence of the magnetoresistance.

Images & Sample Data

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View the embedded image gallery online at:
https://nationalmaglab.org/user-facilities/dc-field/dcfield-techniques/ac-conductivity-dc#sigProId8bb512fcbf

Instrumentation

  • Compatible Magnets

  • Compatible Sample Environments

  • Available Equipment

Resistive Magnets

Superconducting Magnets

  • Stanford Research 830 and Signal Recovery 7265 lock-in amplifiers
  • Stanford Research 554 transformer pre-amp
  • Stanford Research 560 voltage pre-amp
  • Lakeshore 370 resistance bridge

Related Publications

J. Murphy, et al, Angular-dependent upper critical field of overdoped Ba(Fe1−xNix)2As2, Phys. Rev. B (2013) Read online 

K. Wang, et al, Two-dimensional Dirac fermions and quantum magnetoresistance in CaMnBi2, Phys. Rev. B - Rapid Comm. 85 (2012) Read online 

K. Wang, et al, Quantum transport of two-dimensional Dirac fermions in SrMnBi2, Phys. Rev. B – Rapid Comm. 84 (2011) Read online 

E. C. T. O’Farrell, et al, Role of f Electrons in the Fermi Surface of the Heavy Fermion Superconductor beta-YbAlB4, Phys. Review Letters 102 (2009) Read online 

F. Hunte, et al, Two-band superconductivity in LaFeAsO0.89F0.11 at very high magnetic fields, Nature 453 (2008) Read online 

Staff Contacts

For more information, please contact:

Last modified on 26 June 2019
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