High-resolution calorimetry in pulsed magnetic fields

Area of Science:

• Thermodynamics
• Condensed Matter Physics
• Materials Science

Background:

• Accurate measurement of thermodynamic properties under extreme conditions, such as high pulsed magnetic fields, is crucial for understanding exotic material phases.
• Existing calorimetric techniques face challenges in achieving high resolution and field stability in pulsed magnetic fields.

Purpose of the Study:

• To develop and validate a novel calorimeter capable of precise thermodynamic measurements in pulsed magnetic fields.
• To demonstrate the calorimeter's performance using well-characterized and complex materials.

Main Methods:

• Detailed description of the calorimeter's instrumental design and construction, including the RuO2 thermometer sensitivity.
• Application of two measurement techniques: quasi-adiabatic and dual-slope methods for heat capacity determination.
• Testing the calorimeter's performance by measuring heat capacity of pure germanium, CeCu2Ge2, and κ-(BEDT-TTF)2Cu[N(CN)2]Br up to 43.5 T.

Main Results:

• Successful operation of the new calorimeter demonstrated through heat capacity measurements on three distinct samples.
• Achieved high-resolution calorimetry in pulsed magnetic fields, highlighting the importance of field stability.
• Validation of the calorimeter's capability for advanced high-field thermodynamic studies.

Conclusions:

• The developed calorimeter is a significant advancement for high-resolution calorimetry in pulsed magnetic fields.
• This new instrument opens up new avenues for exploring thermodynamic properties under extreme magnetic conditions.
• The study confirms the calorimeter's potential for novel high-field material research.