Realization of random-field dipolar Ising ferromagnetism in a molecular magnet

Abstract

The longitudinal magnetic susceptibility of single crystals of the molecular magnet Mn${}_{12}$-acetate obeys a Curie-Weiss law, indicating a transition to a ferromagnetic phase due to dipolar interactions. With increasing magnetic field applied transverse to the easy axis, the transition temperature decreases considerably more rapidly than predicted by mean field theory to a T=0 quantum critical point. Our results are consistent with an effective Hamiltonian for a random-field Ising ferromagnet in a transverse field, where the randomness is induced by an external field applied to Mn${}_{12}$-acetate crystals that are known to have an intrinsic distribution of locally tilted magnetic easy axes.

arXiv comment4 pages, 4 figures

References in corpus (14)

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• The origin of second-order transverse magnetic anisotropy in Mn12-acetate
• Definitive spectroscopic determination of the transverse interactions responsible for the magnetic quantum tunneling in Mn12-acetate
• Symmetry of Magnetic Quantum Tunneling in Single Molecule Magnet Mn12-acetate
• Ferromagnet in a continuously tuneable random field
• $\mathrm{LiH}{\mathrm{o}}_{\mathrm{x}}{\mathrm{Y}}_{1-\mathrm{x}}{\mathrm{F}}_4$ as a random field Ising ferromagnet
• Role of dipolar and exchange interactions in the positions and widths of EPR transitions for the single-molecule magnets Fe8 and Mn12
• Significance of the Hyperfine Interactions in the Phase Diagram of $\mathrm{LiH}{\mathrm{o}}_{\mathrm{x}}{\mathrm{Y}}_{1-\mathrm{x}}{\mathrm{F}}_4$
• The quantum dynamics of atomic magnets, co-tunneling and dipolar-biased tunneling
• Long-range ferromagnetism of Mn12 acetate single-molecule magnets under a transverse magnetic field
• Second-order transverse magnetic anisotropy induced by disorders in the single-molecule magnet Mn12
• Experimental determination of the dipolar field in Mn12-acetate
• Dipolar Ordering and Quantum Dynamics of Domain Walls in Mn-12 Acetate
• Pure and Random-Field Quantum Criticality in the Dipolar Ising Model: Theory of $M{n}_{12}$ acetates

Cited by in corpus (12)

• Photon Condensation and Enhanced Magnetism in Cavity QED
• Magnetic dipolar ordering and quantum phase transition in Fe8 molecular magnet
• Field evolution of the magnetic structures in Er${}_2$Ti${}_2$O${}_7$ through the critical point
• Onset of a Propagating Self-Sustained Spin Reversal Front in a Magnetic System
• Tunneling and inversion symmetry in single-molecule magnets: the case of the Mn12 wheel molecule
• Novel disordering mechanism in ferromagnetic systems with competing interactions
• Experimental determination of the Weiss temperature of Mn${}_{12}$-ac and Mn${}_{12}$-ac-MeOH
• Transverse Field Ising Ferromagnetism in Mn${}_{12}$-acetate-MeOH
• Dipolar-controlled spin tunneling and relaxation in molecular magnets
• Effective realization of random magnetic fields in compounds with large single-ion anisotropy
• Magnetic-field-tuned randomness in inhomogeneous altermagnets
• Quantum Fluctuations and Long-Range Order in Molecular Magnets