Publication Date

9-24-2018

Department

Ames Laboratory; Physics and Astronomy

Campus Units

Ames Laboratory, Physics and Astronomy

OSTI ID+

1478992

Report Number

IS-J 9781

DOI

10.1063/1.5048008

Journal Title

Review of Scientific Instruments

Volume Number

89

Issue Number

9

First Page

094704

Abstract

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. The performance of the working setup is demonstrated using several superconductors.

DOE Contract Number(s)

AC02-07CH11358

Language

en

Department of Energy Subject Categories

47 OTHER INSTRUMENTATION

Publisher

Iowa State University Digital Repository, Ames IA (United States)

Available for download on Tuesday, September 24, 2019

Included in

Physics Commons

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