Abstract
The magnetocaloric effect is observed in the 1:1:1 compound ErRhSi, which is a metamagnet is reported in this paper. ErRhSi crystallizes in the orthorhombic space group Pnma, adopting the TiNiSi structure type, with lattice parameters a(Å) = 6.7903(5), b(Å) = 4.1881(3), and c(Å) = 7.3847(4). Our magnetic measurements confirm an antiferromagnetic phase transition at TN ≈ 8.5 K, also supported by the specific heat measurement. Crystal field effects of Er3+ are suggested by the inverse magnetic susceptibility data which do not conform to an ideal Curie-Weiss behaviour and also by the total entropy that attains Rln (2) at TN. Although the magnetic hysteresis indicates ErRhSi to be a soft magnet, several clear metamagnetic features are observed at 2 K. Magnetic entropy change ΔSM = − 8.7 J/kg-K is observed at about 9 K with the application of 5 T magnetic field. The corresponding adiabatic temperature change ΔTad is about 4 K. Large magnetocaloric effects suggest that this material is suitable for the low temperature magnetic refrigeration.
Highlights
Magnetic refrigeration based on the magnetocaloric effect (MCE) is an alternative to conventional gas compression refrigeration due to its higher efficiency and ecofriendly procedure.1–4 The key indicators for the performance of magnetic cooling materials are the isothermal magnetic entropy change, DSM, and the adiabatic temperature change, DTad, under applied magnetic fields
The magnetocaloric effect is observed in the 1:1:1 compound ErRhSi
which is a metamagnet is reported in this paper
Summary
Magnetic refrigeration based on the magnetocaloric effect (MCE) is an alternative to conventional gas compression refrigeration due to its higher efficiency and ecofriendly procedure. The key indicators for the performance of magnetic cooling materials are the isothermal magnetic entropy change, DSM, and the adiabatic temperature change, DTad, under applied magnetic fields. Several magnetic alloys have been recently reported with high MCE values; among them, rare earth based intermetallics with negligible thermal and hysteresis loss are of particular interest for practical applications.. One class of materials that are ideally suited for MCE applications of this kind are the alloys with first-order phase transitions. It is interesting to search for materials that show a compromise between magnetic phase transitions and low hysteresis effects in order to enhance the MCE. T 1⁄4 transition metal, X 1⁄4 Si, Ge] compounds are reported to show excellent MCE properties.. T 1⁄4 transition metal, X 1⁄4 Si, Ge] compounds are reported to show excellent MCE properties.14–16 One such compound of recent interest is ErRuSi which was found to order ferromagnetically at 8 K through a first-order transition displaying a giant low-field MCE (15.2 J/kg-K at 2 T).. Our results highlight the MCE and the multiple field-induced metamagnetic features of that material
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