Long-range ferromagnetism of Mn12 acetate single-molecule magnets under a transverse magnetic field

Abstract

We use neutron diffraction to probe the magnetization components of a crystal of Mn12 single-molecule magnets. Each of these molecules behaves, at low temperatures, as a nanomagnet with spin S = 10 and strong anisotropy along the crystallographic c axis. Application of a magnetic field perpendicular to c induces quantum tunneling between opposite spin orientations, enabling the spins to attain thermal equilibrium. Below approximately 0.9 K, intermolecular interactions turn this equilibrium state into a ferromagnetically ordered phase. However, long range ferromagnetic correlations nearly disappear for fields larger 5.5 T, possibly suggesting the existence of a quantum critical point.

arXiv comment4 pages, 4 figures

References in corpus (8)

• Continuous Quantum Phase Transitions
• High frequency EPR spectra of a molecular nanomagnet provide a key to understand Quantum Tunneling of the Magnetization
• Determination of the magnetic anisotropy axes of single-molecule magnets
• Ordering of dipolar Ising crystals
• Quantum Coherence in Fe8 Molecular Nanomagnets
• Phonon-assisted tunneling in the quantum regime of Mn12-ac
• Magnetic long-range order induced by quantum relaxation in single-molecule magnets
• Dipolar ordering in Fe8?

Cited by in corpus (14)

• Magnetothermal properties of molecule-based materials
• Photon Condensation and Enhanced Magnetism in Cavity QED
• Magnetic dipolar ordering and quantum phase transition in Fe8 molecular magnet
• Tunable dipolar magnetism in high-spin molecular clusters
• Realization of random-field dipolar Ising ferromagnetism in a molecular magnet
• Magnetic dipolar ordering and relaxation in the high-spin molecular cluster compound Mn6
• Experimental determination of the dipolar field in Mn12-acetate
• Dipolar Ordering and Quantum Dynamics of Domain Walls in Mn-12 Acetate
• Phases of anisotropic dipolar antiferromagnets
• Experimental determination of the Weiss temperature of Mn${}_{12}$-ac and Mn${}_{12}$-ac-MeOH
• Dipolar-controlled spin tunneling and relaxation in molecular magnets
• Transverse Field Ising Ferromagnetism in Mn${}_{12}$-acetate-MeOH
• Dipolar ordering in crystals of Mn12 Ac
• Quantum Fluctuations and Long-Range Order in Molecular Magnets