000150482 001__ 150482
000150482 005__ 20251017144635.0
000150482 0247_ $$2doi$$a10.1021/jacs.4c17003
000150482 0248_ $$2sideral$$a142669
000150482 037__ $$aART-2025-142669
000150482 041__ $$aeng
000150482 100__ $$aManvell, Anna S.
000150482 245__ $$aA triangular frustrated Eu(II)–Organic framework for sub-kelvin magnetic refrigeration
000150482 260__ $$c2025
000150482 5060_ $$aAccess copy available to the general public$$fUnrestricted
000150482 5203_ $$aAttaining sub-Kelvin temperatures remains technologically challenging and often relies on the scarce resource 3He, unless employing adiabatic demagnetization refrigeration. Herein, the active coolant typically consists of weakly coupled paramagnetic ions, whose magnetic interaction strengths are comparable in energy to the relevant temperature regime of cooling. Such interactions depend strongly on inter-ion distances, fundamentally hindering the realization of dense coolants for sub-Kelvin refrigeration. We present a magnetically concentrated triangular coordination network, Eu0.9Ba0.1I2(pyrazine)3, featuring the large s = 7/2 moment of Eu(II). Electron paramagnetic resonance, magnetization, and heat capacity measurements reflect antiferromagnetic correlations between the Eu(II) ions and a dominant easy-plane magnetic anisotropy. The ensuing geometric frustration prevents entropy-annihilating magnetic order down to at least 0.17 K. This remarkably low operational temperature for a low-dimensional, molecule-based magnetic refrigerant opens possibilities for on-chip cryogenic refrigeration, especially in scenarios where established inorganic refrigerants cannot be utilized.
000150482 536__ $$9info:eu-repo/grantAgreement/ES/AEI/CEX2023-001286-S$$9info:eu-repo/grantAgreement/ES/DGA/E11-23R$$9info:eu-repo/grantAgreement/ES/DGA-FSE/E12-23R-RASMIA$$9info:eu-repo/grantAgreement/ES/MICINN/PID2021-124734OB-C21
000150482 540__ $$9info:eu-repo/semantics/embargoedAccess$$aAll rights reserved$$uhttp://www.europeana.eu/rights/rr-f/
000150482 655_4 $$ainfo:eu-repo/semantics/article$$vinfo:eu-repo/semantics/publishedVersion
000150482 700__ $$aDunstan, Maja A.
000150482 700__ $$aGracia, David
000150482 700__ $$aHrubý, Jakub
000150482 700__ $$aKubus, Mariusz
000150482 700__ $$aMcPherson, James N.
000150482 700__ $$0(orcid)0000-0003-3567-7030$$aPalacios, Elias
000150482 700__ $$aWeihe, Høgni
000150482 700__ $$aHill, Stephen
000150482 700__ $$aSchnack, Jürgen
000150482 700__ $$0(orcid)0000-0002-8028-9064$$aEvangelisti, Marco
000150482 700__ $$aPedersen, Kasper S.
000150482 773__ $$g147, 9 (2025), 7597-7603$$pJ. Am. Chem. Soc.$$tJournal of the American Chemical Society$$x0002-7863
000150482 8564_ $$s10664986$$uhttps://zaguan.unizar.es/record/150482/files/texto_completo.pdf$$yVersión publicada$$zinfo:eu-repo/date/embargoEnd/2026-01-21
000150482 8564_ $$s2852756$$uhttps://zaguan.unizar.es/record/150482/files/texto_completo.jpg?subformat=icon$$xicon$$yVersión publicada$$zinfo:eu-repo/date/embargoEnd/2026-01-21
000150482 909CO $$ooai:zaguan.unizar.es:150482$$particulos$$pdriver
000150482 951__ $$a2025-10-17-14:28:31
000150482 980__ $$aARTICLE