AC measurement of heat capacity and magnetocaloric effect for pulsed magnetic fields

Kohama, Yoshimitsu; Marcenat, Christophe; Klein, Thierry; Jaime, Marcelo
October 2010
Review of Scientific Instruments;Oct2010, Vol. 81 Issue 10, p104902
Academic Journal
A new calorimeter for measurements of the heat capacity and magnetocaloric effect of small samples in pulsed magnetic fields is discussed for the exploration of thermal and thermodynamic properties at temperatures down to 2 K. We tested the method up to μ0H=50 T, but it could be extended to higher fields. For these measurements we used carefully calibrated bare-chip Cernox® and RuO2 thermometers, and we present a comparison of their performances. The monotonic temperature and magnetic field dependences of the magnetoresistance of RuO2 allow thermometry with a precision as good as ±4 mK at T=2 K. To test the performance of our calorimeter, heat capacity and magnetocaloric effect for the spin-dimer compound Sr3Cr2O8 and the triangular lattice antiferromagnet RbFe(MoO4)2 are presented.


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