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

Yoshimitsu KohamaLos Alamos National Laboratory 1 MPA-CMMS, , Los Alamos, New Mexico 87545, USAC. MarcenatCEA-INAC/UJF-Grenoble 1 2 , SPSMS, UMR-E 9001, 17 rue des Martyrs, Grenoble 38054, FranceT. KleinCNRS 3 Institut Néel, , BP 166, Grenoble 38042, France ; , BP 53, Grenoble 38041, France ; and , BP 53, Grenoble 38041, FranceM. JaimeLos Alamos National Laboratory 1 MPA-CMMS, , Los Alamos, New Mexico 87545, USA

2010en

ABI

Annotatsiya

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 μ(0)H=50 T, but it could be extended to higher fields. For these measurements we used carefully calibrated bare-chip Cernox(®) and RuO(2) thermometers, and we present a comparison of their performances. The monotonic temperature and magnetic field dependences of the magnetoresistance of RuO(2) 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 Sr(3)Cr(2)O(8) and the triangular lattice antiferromagnet RbFe(MoO(4))(2) are presented.

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Identifikatorlar

DOI: 10.1063/1.3475155

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