Alina Vinslava

Landau-Zener tunneling in the presence of weak intermolecular interactions in a crystal of Mn-4 single-molecule magnets

A

Azide groups in high oxidation state Mn carboxylate chemistry: a new Mn11 complex and its conversion to a Mn25 azide complex with Me3SiN3

{\mathrm{Mn}}_{4}

Molecules at the Quantum-Classical Nanoparticle Interface: Giant Mn70 Single-Molecule Magnets of ∼4 nm Diameter.

single-molecule magnet (SMM), with a well-isolated spin ground state of

Giant Single-Molecule Magnets: A {Mn84} Torus and Its Supramolecular Nanotubes†

S=9∕2

A record anisotropy barrier for a single-molecule magnet.

, is used as a model system to study Landau-Zener (LZ) tunneling in the presence of weak intermolecular dipolar and exchange interactions. The anisotropy constants

Toward a Magnetostructural Correlation for a Family of Mn6 SMMs

D

A single-molecule magnet with a "twist"

and

Spin Switching via Targeted Structural Distortion

B

Microwave-Assisted Synthesis of a Hexanuclear Mn III Single-Molecule Magnet

are measured with minor hysteresis loops. A transverse field is used to tune the tunnel splitting over a large range. Using the LZ and inverse LZ method, it is shown that these interactions play an important role in the tunnel rates. Three regions are identified: (i) at small transverse fields, tunneling is dominated by single tunnel transitions, (ii) at intermediate transverse fields, the measured tunnel rates are governed by reshuffling of internal fields, and (iii) at larger transverse fields, the magnetization reversal starts to be influenced by the direct relaxation process, and many-body tunnel events may occur. The hole digging method is used to study the next-nearest-neighbor interactions. At small external fields, it is shown that magnetic ordering occurs which does not quench tunneling. An applied transverse field can increase the ordering rate. Spin-spin cross-relaxations, mediated by dipolar and weak exchange interactions, are proposed to explain additional quantum steps.

Turning up the spin, turning on single-molecule magnetism : from S = 1 to S = 7 in a [Mn8] cluster via ligand induced structural distortion

A new high oxidation state Mn(III/IV)(11) carboxylate complex has been prepared and then converted to a Mn(II/III)(25) azide/carboxylate cluster with Me(3)SiN(3); the Mn(25) product is the initial example of a higher oxidation state Mn azide complex not stabilized by any chelate ligands.