Long-range ferromagnetic dipolar ordering of high-spin molecular clusters

Details Long-range ferromagnetic dipolar ordering of high-spin molecular clusters Long-range ferromagnetic dipolar ordering of high-spin molecular clusters

2002-12-16

arxiv.org/abs/cond-mat/0212372v1

Phys. Rev. Lett. 90, 017206 (2003)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 4 .eps figures; accepted for publication in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.90.017206

We 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.

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