Spin density distribution in a partially magnetized organic quantum magnet

TL;DR

This study uses polarized neutron diffraction to map spin density in an organic quantum magnet, revealing quantum fluctuations' significant role and aligning with theoretical models to elucidate exchange interactions.

Contribution

It provides the first detailed experimental spin density distribution in a partially magnetized organic quantum magnet, linking quantum fluctuations to exchange interactions.

Findings

Skewed spin density distribution observed

Quantum spin fluctuations significantly influence the effect

Data agrees with model Hamiltonian calculations

Abstract

Polarized neutron diffraction experiments on an organic magnetic material reveal a highly skewed distribution of spin density within the magnetic molecular unit. The very large magnitude of the observed effect is due to quantum spin fluctuations. The data are in quantitative agreement with direct diagonalization results for a model spin Hamiltonian, and provide insight on the actual microscopic origin of the relevant exchange interactions.