2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/97439We report the first example of a transition to long-range magnetic order in a purely dipolarly interacting molecular magnet. For the magnetic cluster compound Mn6O4Br4(Et2dbm)6, the anisotropy experienced by the total spin S=12 of each cluster is so small that spin-lattice relaxation remains fast down to the lowest temperatures, thus enabling dipolar order to occur within experimental times at Tc = 0.16 K. In high magnetic fields, the relaxation rate becomes drastically reduced and the interplay between nuclear- and electron-spin lattice relaxation is revealed.4 pages, 4 .eps figures; accepted for publication in Phys. Rev. LettMesoscale and Nanoscale PhysicsMaterials Sciencetext