149132 20251017144554.0 doi 10.1039/c9dt04816b sideral 117220 ART-2020-117220 eng Rubín, Javier Universidad de Zaragoza (orcid)0000-0003-1029-3751 Magnetic chains of Fe3 clusters in the {Fe3YO2} butterfly molecular compound 2020 Access copy available to the general public Unrestricted The "butterfly" molecule [Fe3Y(µ3-O)2(CCl3COO)8(H2O)(THF)3] (in brief {Fe3YO2}) includes three Fe3+ ions which build a robust Fe3 cluster with a strong intracluster antiferromagnetic exchange and a total spin S = 5/2. It represents the starting magnetic system to study further interactions with magnetic rare earths when Y is replaced with lanthanides. We present heat capacity and equilibrium susceptibility measurements below 2 K, which show that each cluster has a sizeable magnetic anisotropy pointing to the existence of intercluster interactions. However, no phase transition to a long-range magnetically ordered phase is observed down to 20 mK. The intercluster interaction is analysed in the framework of the one-dimensional Blume-Capel model with an antiferromagnetic chain interaction constant J/kB = -40(2) mK between Fe3 cluster spins, and a uniaxial anisotropy with parameter D/kB = -0.56(3) K. This is associated to single chains of Fe3 clusters oriented along the shortest intercluster distances displayed by the crystal structure of {Fe3YO2}. Ac susceptibility measurements reveal that the magnetic relaxation is dominated by a quantum tunnelling process below 0.2 K, and by thermally activated processes above this temperature. The experimental activation energy of this single chain magnet, Ea/kB = 3.4(6) K, can be accounted for by the combination of contributions arising from single-molecule magnetic anisotropy and spin-spin correlations along the chains. info:eu-repo/grantAgreement/ES/DGA/E09-17R info:eu-repo/grantAgreement/ES/DGA/E12-R17 info:eu-repo/grantAgreement/ES/MCINN/MAT2017-83468-R info:eu-repo/grantAgreement/ES/MCINN/PCI2018-093116 info:eu-repo/grantAgreement/ES/MICINN/RTI2018-096075-B-C21 info:eu-repo/grantAgreement/EUR/MOLSPIN-COST/CA15128 info:eu-repo/semantics/openAccess All rights reserved http://www.europeana.eu/rights/rr-f/ 4.39 2020 CHEMISTRY, INORGANIC & NUCLEAR 8 / 45 = 0.178 2020 Q1 T1 0.98 2020 Inorganic Chemistry 2020 Q1 info:eu-repo/semantics/article info:eu-repo/semantics/acceptedVersion Badía-Romano, Laura Universidad de Zaragoza (orcid)0000-0002-6045-3576 Luis, Fernando Universidad de Zaragoza (orcid)0000-0001-6284-0521 Mereacre, Valeriu Prodius, Denis Arauzo, Ana Universidad de Zaragoza (orcid)0000-0002-5999-341X Bartolomé, Fernando Universidad de Zaragoza (orcid)0000-0002-0047-1772 Bartolomé, Juan Universidad de Zaragoza (orcid)0000-0002-6517-1236 5001 065 Universidad de Zaragoza Dpto. Ciencia Tecnol.Mater.Fl. Área Cienc.Mater. Ingen.Metal. 2003 395 Universidad de Zaragoza Dpto. Física Materia Condensa. Área Física Materia Condensada 49, 9 (2020), 2979-2988 Dalton Trans. Dalton Transactions 1477-9226 6583451 http://zaguan.unizar.es/record/149132/files/texto_completo.pdf Postprint 1513841 http://zaguan.unizar.es/record/149132/files/texto_completo.jpg?subformat=icon icon Postprint oai:zaguan.unizar.es:149132 articulos driver 2025-10-17-14:12:33 ARTICLE