Adiabatic measurements of magneto-caloric effects in pulsed high magnetic fields up to 55 T

TL;DR

This paper presents a new adiabatic measurement system for magneto-caloric effects in pulsed magnetic fields up to 55 T, enabling rapid thermodynamic property analysis across a wide temperature range.

Contribution

It introduces a novel setup with a thin film thermometer directly on the sample, allowing accurate MCE measurements in pulsed fields up to 55 T.

Findings

Valid measurements on Gd at room temperature

Accurate low-temperature data on Gd3Ga5O12

Ability to estimate entropy changes from MCE and specific heat data

Abstract

Magneto-caloric effects (MCEs) measurement system in adiabatic condition is proposed to investigate the thermodynamic properties in pulsed magnetic fields up to 55 T. With taking the advantage of the fast field- sweep rate in pulsed field, adiabatic measurements of MCEs were carried out at various temperatures. To obtain the prompt response of the thermometer in the pulsed field, a thin film thermometer is grown directly on the sample surfaces. The validity of the present setup was demonstrated in the wide temperature range through the measurements on Gd at about room temperature and on Gd3Ga5O12 at low temperatures. The both results show reasonable agreement with the data reported earlier. By comparing the MCE data with the specific heat data, we could estimate the entropy as functions of magnetic field and temperature. The results demonstrate the possibility that our approach can trace the change in transition temperature caused by the external field.