Measuring thermal conductivity in extreme conditions: sub-Kelvin temperatures and high (27 T) magnetic fields

TL;DR

This paper introduces a specialized measurement setup capable of accurately determining thermal conductivity and electrical resistivity of bulk samples at ultra-low temperatures and high magnetic fields, addressing challenges posed by large resistive magnets.

Contribution

The authors develop a novel one-heater-two-thermometer setup that functions effectively at temperatures as low as 0.1 K and magnetic fields up to 27 T, overcoming previous technical limitations.

Findings

Successful measurement of thermal conductivity down to 0.1 K

Effective operation in magnetic fields up to 27 T

Overcomes challenges with large water-cooled resistive magnets

Abstract

We present a one-heater-two-thermometer set-up for measuring thermal conductivity and electric resistivity of a bulk sample at low temperatures down to 0.1 K and in magnetic fields up to 27 Tesla. The design overcomes the difficulties emerging in the context of large water-cooled resistive magnets.