Magnetization process of the S=1/2 Heisenberg antiferromagnet on the floret pentagonal lattice

TL;DR

This study investigates the magnetization behavior of the S=1/2 Heisenberg antiferromagnet on a floret pentagonal lattice, revealing unique magnetization plateaux and jumps not observed in similar systems.

Contribution

It provides the first detailed numerical analysis of the magnetization process on this lattice, highlighting novel phenomena like unexpected magnetization jumps.

Findings

Magnetization plateaux at one-ninth, one-third, and seven-ninths of saturation.

Plateaux at one-third and seven-ninths are due to specific spin interactions.

Observation of a unique magnetization jump not associated with plateaux.

Abstract

We study the S=1/2 Heisenberg antiferromagnet on the floret pentagonal lattice by numerical diagonalization method. This system shows various behaviours that are different from that of the Cairo-pentagonal-lattice antiferromagnet. The ground-state energy without magnetic field and the magnetization process of this system are reported. Magnetization plateaux appear at one-ninth height of the saturation magnetization, at one-third height, and at seven-ninth height. The magnetization plateaux at one-third and seven-ninth heights come from interactions linking the sixfold-coordinated spin sites. A magnetization jump appears from the plateau at one-ninth height to the plateau at one-third height. Another magnetization jump is observed between the heights corresponding to the one-third and seven-ninth plateaux; however the jump is away from the two plateaux, namely, the jump is not accompanied with any magnetization plateaux. The jump is a peculiar phenomenon that has not been reported.