Magnetic Susceptibility Measurements at Ultra-low Temperatures

  • L. Yin
  • J. S. Xia
  • N. S. Sullivan
  • V. S. Zapf
  • A. Paduan-Filho
Article

Abstract

We report the design and operation of a device for ac magnetic susceptibility measurements that can operate down to 1 mK. The device, a modification of the standard mutual inductance bridge, is designed with detailed consideration of the thermalization and optimization of each element. First, in order to reduce local heating, the primary coil is made with superconducting wire. Second, a low-temperature transformer which is thermally anchored to the mixing chamber of a dilution refrigerator, is used to match the output of the secondary coil to a high-sensitivity bridge detector. The careful thermal anchoring of the secondary coil and the matching transformer is required to reduce the overall noise temperature and maximize sensitivity. The sample is immersed in liquid 3He to minimize the Kapitza thermal resistance. The magnetic susceptibility of several magnetic compounds, such as the well-known spin gap compound NiCl2-4SC(NH2)2 and other powdered samples, have been successfully measured to temperatures well below 10 mK.

AC susceptibility Ultra-low temperature 

PACS

07.05.Fb 07.55.Jg 

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Copyright information

© Springer Science+Business Media, LLC 2009

Authors and Affiliations

  • L. Yin
    • 1
  • J. S. Xia
    • 1
  • N. S. Sullivan
    • 1
  • V. S. Zapf
    • 2
  • A. Paduan-Filho
    • 3
  1. 1.National High Magnetic Field LaboratoryUniversity of FloridaGainesvilleUSA
  2. 2.National High Magnetic Field LaboratoryLos Alamos National LaboratoryLos AlamosUSA
  3. 3.Instituto de FisicaUniversidade de Sao PauloSao PauloBrazil

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