AC specific heat and MCE measurements in 50T pulsed magnetic fields

ORAL

Abstract

Specific heat (Cp) and magnetocaloric effect (MCE) are useful tools in the experimental determination and understanding of the temperature-magnetic field phase diagram of materials. While previous studies are mostly limited to measurements in DC magnets, here we discuss a new AC calorimeter to measure these properties in 250 ms, 50T capacitor bank- and motor generator-driven pulsed magnetic fields. As a test sample we choose the spin S = 1/2 dimmer compound Sr3Cr2O8, which shows a field-induced phase transition between Hc1 = 30.4 T and Hc2 = 62 T. We compare our pulsed field data with the previous results measured in DC fields and analyze advantages and shortcomings of our new approach.

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Authors

  • Y. Kohama

    MPA-CMMS, Los Alamos National Laboratory, NHMFL, Los Alamos National Laboratory, Los Alamos, NM, USA

  • Marcelo Jaime

    National High Magnetic Field Laboratory, Los Alamos National Laboratory, Los Alamos National Laboratory, MPA-CMMS, Los Alamos National Laboratory, NHMFL, Los Alamos National Laboratory, Los Alamos, NM, USA

  • Christophe Marcenat

    CEA-Grenoble, Institut Nanosciences et Cryognie

  • Adam Aczel

    Department of Physics and Astronomy, McMaster University

  • Graeme Luke

    Department of Physics and Astronomy, McMaster University, McMaster University and the Canadian Institute for Advanced Research