Nicole E. Chakov

Quantum phase interference and spin-parity in Mn12 single-molecule magnets.

Magnetization measurements of Mn12 molecular nanomagnets with spin ground states of S=10 and S=19/2 show resonance tunneling at avoided energy level crossings. The observed oscillations of the tunnel probability as a function of the magnetic field applied along the hard anisotropy axis are due to topological quantum phase interference of two tunnel paths of opposite windings. Spin-parity dependent tunneling is established by comparing the quantum phase interference of integer and half-integer spin systems.

Determination of the magnetic anisotropy axes of single-molecule magnets

Simple methods are presented allowing the determination of the magnetic anisotropy axes of a crystal of a single-molecule magnet. These methods are used to determine an upper bound of the easy axis tilts in a standard

Propagation of Avalanches inMn12-Acetate: Magnetic Deflagration

{\mathrm{Mn}}_{12}\text{\ensuremath{-}}\mathrm{Ac}

Evidence for the S = 9 excited state in Mn 12 -bromoacetate measured by electron paramagnetic resonance

crystal. The values obtained in the present study are compared to those reported in recent high frequency electron paramagnetic resonance studies which suggest distributions of hard-axes tilts.

Reaction of [Mn12O12(O2CR)16(H2O)4] single-molecule magnets with non-carboxylate ligands

Local time-resolved measurements of fast reversal of the magnetization of single crystals of Mn12-acetate indicate that the magnetization avalanche spreads as a narrow interface that propagates through the crystal at a constant velocity that is roughly 2 orders of magnitude smaller than the speed of sound. We argue that this phenomenon is closely analogous to the propagation of a flame front (deflagration) through a flammable chemical substance.

Crystal Lattice Desolvation Effects On The Magnetic Quantum Tunneling Of Single-Molecule Magnets

We present high-frequency high-field electron paramagnetic resonance (EPR) measurements on the

Magnetic relaxation studies on a single-molecule magnet by time-resolved inelastic neutron scattering

[{\mathrm{Mn}}_{12}{\mathrm{O}}_{12}{({\mathrm{O}}_{2}\mathrm{C}\mathrm{C}{\mathrm{H}}_{2}\mathrm{Br})}_{16}{({\mathrm{H}}_{2}\mathrm{O})}_{4}∙4\mathrm{C}{\mathrm{H}}_{2}{\mathrm{Cl}}_{2}]

A spectroscopic comparison between several high-symmetry S=10 Mn12 single-molecule magnets

dodecanuclear manganese complex

Single-molecule magnets. A Mn12 complex with mixed carboxylate-sulfonate ligation: [Mn12O12(O2CMe)8(O3SPh)8(H2O)4]

({\mathrm{Mn}}_{12}\text{\penalty1000-\hskip0pt}\mathrm{Br}\mathrm{Ac})

Local measurements of magnetization in Mn12 crystals

. The crystal-field parameters are found to be very similar to those of the original compound