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Title: Tunnel diode resonator for precision magnetic susceptibility measurements in a mK temperature range and large DC magnetic fields

Journal Article · · Review of Scientific Instruments
DOI: https://doi.org/10.1063/1.5048008 · OSTI ID:1478992
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [2]
  1. Ames Lab. and Iowa State Univ., Ames, IA (United States); Univ. of Maryland, College Park, MD (United States)
  2. Ames Lab. and Iowa State Univ., Ames, IA (United States)
+ Show Author Affiliations

Precision radio-frequency measurements of the magnetic susceptibility using the tunnel diode resonator (TDR) technique are used to study the delicate effects in magnetic and superconducting materials. High resolution (in ppb range) measurements are particularly important for studies of the London and Campbell penetration depths in a superconductor and for the investigation of magnetic transitions in (anti)ferromagnets. Due to the small rf magnetic-excitation in a mOe range, the TDR is especially useful at low-temperatures in a mK range, if Joule heating generated in the TDR circuitry is efficiently removed and the circuit is stabilized with sub-mK precision. Unfortunately, the circuit has significant magnetic field dependence, and therefore, most of the precision TDR measurements at low-temperatures were conducted in zero magnetic field. In this work, we describe the design of a setup for precision TDR measurements in a dilution refrigerator down to ~40 mK with a 14 T superconducting magnet. The key features of our design are the separated electronics components and the placement of the most field sensitive parts in the field-compensated zone far from the center of solenoid as well as the heat-sinking at a higher temperature stage. As a result, the performance of the working setup is demonstrated using several superconductors.

Research Organization:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC02-07CH11358
OSTI ID:
1478992
Alternate ID(s):
OSTI ID: 1472213
Report Number(s):
IS-J--9781
Journal Information:
Review of Scientific Instruments, Journal Name: Review of Scientific Instruments Journal Issue: 9 Vol. 89; ISSN 0034-6748
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English

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Cited By (2)

Dielectric resonator method for determining gap symmetry of superconductors through anisotropic nonlinear Meissner effect journal April 2019
Dielectric Resonator Method For Determining Gap Symmetry Of Superconductors Through Anisotropic Nonlinear Meissner Effect text January 2019

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