The molecular magnet Hpyr [Fe17 O16 (OH) 12 (py) 12 Br4] Br4 (" Fe17 ") has a well-defined cluster spin ground state of S=35/2 at low temperatures and an axial molecular anisotropy of only D-0.02K. Dipolar interactions between the molecular spins induce long-range magnetic order below 1.1 K. We report here the magnetic structure of Fe17, as determined by unpolarized neutron diffraction experiments performed on a polycrystalline sample of deuterated Fe17 in zero applied magnetic field. In addition, we report bulk susceptibility, magnetization, and specific heat data. The temperature dependence of the long-range magnetic order has been tracked and is well accounted for within mean-field theory. Ferromagnetic order along the crystallographic c axis of the molecular spins, as determined by the neutron diffraction experiments, is in agreement with ground-state dipolar energy calculations. © 2008 The American Physical Society.

From single-molecule magnetism to long-range ferromagnetism in Hpyr [Fe17 O16 (OH) 12 (py) 12 Br4] Br4 / Vecchini, C.; Ryan, D. H.; Cranswick, L. M. D.; Evangelisti, M.; Kockelmann, W.; Radaelli, P. G.; Candini, A.; Affronte, M.; Gass, I. A.; Brechin, E. K.; Moze, O.. - In: PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS. - ISSN 1098-0121. - 77:22(2008), pp. 1-8. [10.1103/PhysRevB.77.224403]

From single-molecule magnetism to long-range ferromagnetism in Hpyr [Fe17 O16 (OH) 12 (py) 12 Br4] Br4

Vecchini C.;Candini A.;Affronte M.;Moze O.
2008

Abstract

The molecular magnet Hpyr [Fe17 O16 (OH) 12 (py) 12 Br4] Br4 (" Fe17 ") has a well-defined cluster spin ground state of S=35/2 at low temperatures and an axial molecular anisotropy of only D-0.02K. Dipolar interactions between the molecular spins induce long-range magnetic order below 1.1 K. We report here the magnetic structure of Fe17, as determined by unpolarized neutron diffraction experiments performed on a polycrystalline sample of deuterated Fe17 in zero applied magnetic field. In addition, we report bulk susceptibility, magnetization, and specific heat data. The temperature dependence of the long-range magnetic order has been tracked and is well accounted for within mean-field theory. Ferromagnetic order along the crystallographic c axis of the molecular spins, as determined by the neutron diffraction experiments, is in agreement with ground-state dipolar energy calculations. © 2008 The American Physical Society.
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22
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From single-molecule magnetism to long-range ferromagnetism in Hpyr [Fe17 O16 (OH) 12 (py) 12 Br4] Br4 / Vecchini, C.; Ryan, D. H.; Cranswick, L. M. D.; Evangelisti, M.; Kockelmann, W.; Radaelli, P. G.; Candini, A.; Affronte, M.; Gass, I. A.; Brechin, E. K.; Moze, O.. - In: PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS. - ISSN 1098-0121. - 77:22(2008), pp. 1-8. [10.1103/PhysRevB.77.224403]
Vecchini, C.; Ryan, D. H.; Cranswick, L. M. D.; Evangelisti, M.; Kockelmann, W.; Radaelli, P. G.; Candini, A.; Affronte, M.; Gass, I. A.; Brechin, E. K.; Moze, O.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11380/1207398
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