63279 20171129112116.0 doi 10.1038/ncomms6321 sideral 97201 ART-2014-97201 eng Sharples, Joseph W. Quantum signatures of a molecular nanomagnet in direct magnetocaloric measurements 2014 Access copy available to the general public Unrestricted Geometric spin frustration in low-dimensional materials, such as the two-dimensional kagome or triangular antiferromagnetic nets, can significantly enhance the change of the magnetic entropy and adiabatic temperature following a change in the applied magnetic field, that is, the magnetocaloric effect. In principle, an equivalent outcome should also be observable in certain high-symmetry zero-dimensional, that is, molecular, structures with frustrated topologies. Here we report experimental realization of this in a heptametallic gadolinium molecule. Adiabatic demagnetization experiments reach B200 mK, the first sub-Kelvin cooling with any molecular nanomagnet, and reveal isentropes (the constant entropy paths followed in the temperature-field plane) with a rich structure. The latter is shown to be a direct manifestation of the trigonal antiferromagnetic net structure, allowing study of frustration-enhanced magnetocaloric effects in a finite system. info:eu-repo/grantAgreement/ES/MINECO/MAT2012-38318-C03-01 info:eu-repo/grantAgreement/ES/MINECO/MAT2013-44063-R info:eu-repo/semantics/openAccess by http://creativecommons.org/licenses/by/3.0/es/ 11.47 2014 MULTIDISCIPLINARY SCIENCES 3 / 57 = 0.053 2014 Q1 T1 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Collison, David McInnes, Eric J. L. Schnack, Juergen (orcid)0000-0003-3567-7030 Palacios, Elias Universidad de Zaragoza (orcid)0000-0002-8028-9064 Evangelisti, Marco Universidad de Zaragoza 2003 395 Universidad de Zaragoza Departamento de Física de la Materia Condensada Física de la Materia Condensada 5 (2014), 5321 [6 pp] NATURE COMMUNICATIONS NATURE COMMUNICATIONS 2041-1723 1402228 http://zaguan.unizar.es/record/63279/files/texto_completo.pdf Versión publicada 57897 http://zaguan.unizar.es/record/63279/files/texto_completo.jpg?subformat=icon icon Versión publicada oai:zaguan.unizar.es:63279 articulos driver 2017-11-28-12:45:16 ARTICLE