Abstract
Recent advances in magnet technology have enabled the generation of pulsed magnetic fields of 40–60 T with pulse durations on the order of one second and highly stable flat-top waveforms. Taking advantage of such long-pulse high magnetic fields, we have developed a high-speed and high-precision heat capacity measurement technique based on the quasi-adiabatic method. By optimizing the calorimeter design and the measurement system, a single heat capacity data point can be acquired within approximately 10 ms, allowing efficient data collection within a single field pulse. The combination of a highly stable flat-top magnetic field and a dedicated probe design results in a measurement resolution better than 1 nJ K−1 at 1 K, exceeding the performance of commercial heat capacity measurement systems. Further improvements in the measurement algorithm enable highly efficient experiments, making it possible to complete comprehensive measurements on a single sample within several days of magnet time. The technique presented here is expected to contribute significantly to condensed matter research as pulsed-magnet technologies continue to advance worldwide.
https://ror.org/057zh3y96 
