Anomalous magnetization of $S$=2 ferromagnetic-antiferromagnetic alternating chain with Ising anisotropy

TL;DR

This paper reports the first experimental realization of an $S=2$ ferromagnetic-antiferromagnetic alternating chain with Ising anisotropy, revealing an anomalous magnetization change likely due to quantum effects.

Contribution

It introduces a new Mn-verdazyl complex as the first experimental $S=2$ F-AF alternating chain with Ising anisotropy and observes quantum-related magnetization anomalies.

Findings

Confirmed $S=2$ F-AF chain formation below 100 K

Observed anomalous magnetization change at 1/4 saturation

Demonstrated quantum nature of the magnetic system

Abstract

We present the first experimental realization of an $S=2$ ferromagnetic-antiferromagnetic (F-AF) alternating chain in a new Mn-verdazyl complex [Mn(hfac)$_2$]$\cdot$($o$-Py-V) [hfac=1,1,1,5,5,5-hexafluoroacetylacetonate; $o$-Py-V=3-(2-pyridyl)-1,5-diphenylverdazyl]. Through the $ab$ $initio$ molecular orbital calculation, magnetization, and ESR measurements, this compound is confirmed to form an $S=2$ F-AF alternating chain with Ising anisotropy below about 100 K. Furthermore, we find an anomalous change in magnetization at 1/4 of the saturation value, which is probably a manifestation of the quantum nature of the system.