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Magnetocaloric effect of gadolinium in high magnetic fields
Gottschall, T.; Kuz'Min, M. D.; Skokov, K. P.; Skourski, Y.; Fries, M.; Gutfleisch, O.; Ghorbani Zavareh, M.; Schlagel, D. L.; Mudryk, Y.; Pecharsky, V.; Wosnitza, J.;
The magnetocaloric effect of gadolinium has been measured directly in pulsed magnetic fields up to 62 T. The maximum observed adiabatic temperature change is ΔTad = 60.5 K, the initial temperature T0 being just above 300 K. The field dependence of ΔTad is found to follow the usual H2/3 law, with a small correction in H4/3. However, as H is increased, a radical change is observed in the dependence of ΔTad on T0, at H = const. The familiar caret-shaped peak situated at T0 = TC becomes distinctly asymmetric, its high-temperature slope becoming more gentle and evolving into a broad plateau. For yet higher magnetic fields, μ0H ≥ 140 T, calculations predict a complete disappearance of the maximum near TC and an emergence of a new very broad maximum far above TC.

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Publ.-Id: 29198 - Permalink