High-resolution Calorimetry in Pulsed Magnetic Fields

TL;DR

This paper introduces a new high-resolution calorimeter designed for thermodynamic measurements in pulsed magnetic fields up to 43.5 T, demonstrating its effectiveness with various samples and measurement techniques.

Contribution

The paper presents a novel calorimeter design with detailed construction and operation methods, enabling high-resolution heat capacity measurements in pulsed magnetic fields.

Findings

Successful measurement of heat capacity in pulsed fields up to 43.5 T.

Field-stability is crucial for high-resolution measurements.

The calorimeter performs well with quasi-adiabatic and dual-slope methods.

Abstract

We have developed a new calorimeter for measuring thermodynamic properties in pulsed magnetic fields. An instrumental design is described along with the construction details including the sensitivity of a RuO2 thermometer. The operation of the calorimeter is demonstrated by measuring heat capacity of three samples, pure Germanium, CeCu2Ge2, and $\kappa$-(BEDT-TTF)2Cu[N(CN)2]Br, in pulsed fields up to 43.5 T. We have found that realization of field-stability is a key for measuring high-resolution heat capacity under pulsed fields. We have also tested the performance of the calorimeter by employing two measurement techniques; the quasi-adiabatic and dual-slope methods. We demonstrate that the calorimeter developed in this study is capable of performing high-resolution calorimetry in pulsed magnetic fields, which opens new opportunities for high-field thermodynamic studies.