doi:10.1038/ncomms6321engSharples, Joseph W.Collison, DavidMcInnes, Eric J. L.Schnack, JuergenPalacios, EliasEvangelisti, MarcoQuantum signatures of a molecular nanomagnet in direct magnetocaloric measurementsART-2014-97201Geometric 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.2014http://zaguan.unizar.es/record/6327910.1038/ncomms6321http://zaguan.unizar.es/record/63279oai:zaguan.unizar.es:63279info:eu-repo/grantAgreement/ES/MINECO/MAT2012-38318-C03-01info:eu-repo/grantAgreement/ES/MINECO/MAT2013-44063-RNATURE COMMUNICATIONS 5 (2014), 5321 [6 pp]byhttp://creativecommons.org/licenses/by/3.0/es/info:eu-repo/semantics/openAccess