Giant magnetocaloric effect in a rare-earth-free layered coordination polymer at liquid hydrogen temperatures

J. J. B. Levinsky, B. Beckmann, T. Gottschall, D. Koch, M. Ahmadi, O. Gutfleisch and G. R. Blake ()
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J. J. B. Levinsky: University of Groningen, Nijenborgh 3
B. Beckmann: Technical University of Darmstadt
T. Gottschall: Helmholtz-Zentrum Dresden-Rossendorf (HZDR)
D. Koch: Technical University of Darmstadt
M. Ahmadi: University of Groningen, Nijenborgh 3
O. Gutfleisch: Technical University of Darmstadt
G. R. Blake: University of Groningen, Nijenborgh 3

Nature Communications, 2024, vol. 15, issue 1, 1-9

Abstract: Abstract Magnetic refrigeration, which utilizes the magnetocaloric effect, can provide a viable alternative to the ubiquitous vapor compression or Joule-Thompson expansion methods of refrigeration. For applications such as hydrogen gas liquefaction, the development of magnetocaloric materials that perform well in moderate magnetic fields without using rare-earth elements is highly desirable. Here we present a thorough investigation of the structural and magnetocaloric properties of a novel layered organic-inorganic hybrid coordination polymer Co4(OH)6(SO4)2[enH2] (enH2 = ethylenediammonium). Heat capacity, magnetometry and direct adiabatic temperature change measurements using pulsed magnetic fields reveal a field-dependent ferromagnetic second-order phase transition at 10 K

Date: 2024
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DOI: 10.1038/s41467-024-52837-x

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