Dipolar ordering in Fe8?

Abstract

We show that the low-temperature physics of molecular nanomagnets, contrary to the prevailing one-molecule picture, must be determined by the long-range magnetic ordering due to many-body dipolar interactions. The calculations here performed, using Ewald's summation, suggest a ferromagnetic ground state with a Curie temperature of about 130 mK. The energy of this state is quite close to those of an antiferromagnetic state and to a glass of frozen spin chains. The latter may be realized at finite temperature due to its high entropy.

arXiv comment7 pages, no figures, submitted to EPL

References in corpus (13)

• Thermally Activated Resonant Magnetization Tunneling in Molecular Magnets: Mn_12Ac and others
• Low-Temperature Quantum Relaxation in a System of Magnetic Nanomolecules
• Observation of the distribution of molecular spin states by resonant quantum tunneling of the magnetization
• Spin Tunneling and Phonon-assisted Relaxation in Mn12-acetate
• The effects of nuclear spins on the quantum relaxation of the magnetization for the molecular nanomagnet Fe_8
• Nuclear spin driven resonant tunnelling of magnetisation in Mn12 acetate
• Ordering of dipolar Ising crystals
• Quantum Coherence in Fe8 Molecular Nanomagnets
• Quantum aging in mean-field models
• Many-Spin Interactions and Spin Excitations in Mn12
• Low temperature magnetic hysteresis in Mn${}_{12}$ acetate single crystals
• Quantum statistical metastability for a finite spin
• Quantum Fluctuations in Large-Spin Molecules

Cited by in corpus (18)

• Magnetothermal properties of molecule-based materials
• Spin-spin cross-relaxation in single-molecule magnets
• Detailed single crystal EPR lineshape measurements for the single molecule magnets Fe8Br and Mn12-ac
• Superradiance from crystals of molecular nanomagnets
• Role of dipolar and exchange interactions in the positions and widths of EPR transitions for the single-molecule magnets Fe8 and Mn12
• Magnetic long-range order induced by quantum relaxation in single-molecule magnets
• Landau-Zener tunneling in the presence of weak intermolecular interactions in a crystal of Mn4 single-molecule magnets
• Magnetic dipolar ordering and quantum phase transition in Fe8 molecular magnet
• Tunable dipolar magnetism in high-spin molecular clusters
• Long-range ferromagnetism of Mn12 acetate single-molecule magnets under a transverse magnetic field
• Magnetic dipolar ordering and relaxation in the high-spin molecular cluster compound Mn6
• Tunneling with dissipation and decoherence for a large spin
• Many-body Landau-Zener effect at fast sweep
• Dipolar Ordering and Quantum Dynamics of Domain Walls in Mn-12 Acetate
• Magneto-elastic waves in crystals of magnetic molecules
• Phases of anisotropic dipolar antiferromagnets
• LiHoF4 as a spin-half non-standard quantum Ising system
• Internal dipolar field and soft magnons in periodic nanocomposite magnets