Journal of Low Temperature Physics

, Volume 193, Issue 1–2, pp 60–73 | Cite as

LongHCPulse: Long-Pulse Heat Capacity on a Quantum Design PPMS

  • Allen ScheieEmail author


This paper presents LongHCPulse: software which enables heat capacity to be collected on a Quantum Design PPMS using a long-pulse method. This method, wherein heat capacity is computed from the time derivative of sample temperature over long (30 min) measurement times, is necessary for probing first-order transitions and shortens the measurement time by a factor of five. LongHCPulse also includes plotting utilities based on the Matplotlib library. I illustrate the use of LongHCPulse with the example of data taken on \(\mathrm{Yb_{2}Ti_{2}O_{7}}\), \(\mathrm{KNi_{2}Se_{2}}\), and \(\mathrm Na_2Ti_3Cl_8\), comparing the results to the standard semi-adiabatic method.


Heat capacity Phase transitions PPMS 



Thanks to Kate Arpino, James R. Neilson, and Zachary Kelley for allowing me to test LongHCPulse with their data. Thanks also to Tyrel M. McQueen for additional helpful suggestions. The author was supported through the Gordon and Betty Moore foundation under the EPIQS program GBMF4532.

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Institute for Quantum Matter and Department of Physics and AstronomyJohns Hopkins UniversityBaltimoreUSA

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