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Nuclear susceptibility thermometry using enriched (119)Sn.

J Babcock¹, J Kiely, T Manley

¹School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455.

The Review of Scientific Instruments

|October 1, 1979

Summary

Highly enriched 119Sn was used for static nuclear susceptibility thermometry. This new thermometer demonstrates accurate linearity in the 2-15 mK range, offering ease of use and rapid response for low-temperature measurements.

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Area of Science:

Low-temperature physics
Condensed matter physics
Metrology

Background:

Accurate thermometry below 10 mK is crucial for fundamental research.
Existing methods can be complex or lack precision in this range.
Nuclear susceptibility thermometry offers a promising alternative.

Purpose of the Study:

To evaluate the performance of enriched 119Sn for static nuclear susceptibility thermometry.
To calibrate the 119Sn thermometer in the millikelvin range.
To assess its practical usability for low-temperature measurements.

Main Methods:

Utilizing 84.5% enriched 119Sn for static nuclear susceptibility measurements.
Calibrating the thermometer against known temperature points in the 2-40 mK range.
Analyzing the linearity of the thermometer's response with respect to temperature.

Main Results:

The 119Sn thermometer exhibits accurate linearity in the 2-15 mK range.
The thermometer is characterized by its ease of use.
Rapid response times were observed, indicating efficient thermal coupling.

Conclusions:

Enriched 119Sn is a viable and effective material for static nuclear susceptibility thermometry.
This thermometer provides a reliable and practical tool for measurements in the low millikelvin range.
Its performance characteristics make it suitable for various low-temperature experimental applications.