Bose-Einstein condensation of semi-hard bosons in S=1 dimerized organic compound F2PNNNO

TL;DR

This paper models the magnetic behavior of the organic compound F2PNNNO using a lattice boson approach with an extended exclusion principle, explaining its complex magnetization and phase transitions.

Contribution

It introduces a lattice boson model with an extended Pauli's exclusion principle to explain the magnetic properties of a spin-one dimerized compound.

Findings

The model reproduces the experimental magnetization curve.

It reveals a sequence of phase transitions driven by magnetic field.

The behavior is explained by tuning magnon density in the system.

Abstract

An analysis of the energy spectrum and the magnetization curve of two-dimensional organic antiferromagnet F2PNNNO with a spin-one dimerized structure shows that a behavior of the compound in an external magnetic field can be explained within a lattice boson model with an extended Pauli's exclusion principle, i.e. no more than two bosons per a dimer. The unusual magnetization curve observed experimentally in the compound reflects a sequence of phase transitions intrinsic for a lattice boson system with strong on-site and inter-site repulsions due to a tuning of magnon density by the applied magnetic field.