Metamagnetism and Weak Ferromagnetism in Nickel (II) oxalate crystals

TL;DR

This study investigates the magnetic properties of nickel (II) oxalate dihydrate microcrystals, revealing metamagnetic transitions and weak ferromagnetism, with implications for understanding low-dimensional magnetic systems.

Contribution

The paper reports the synthesis and magnetic characterization of nickel (II) oxalate crystals, highlighting novel magnetic behaviors such as metamagnetism and weak ferromagnetism in this compound.

Findings

Sharp magnetic susceptibility peak at 3.3 K

Metamagnetic transition at magnetic fields ≥ 3.5 T

Weak ferromagnetism observed between 3.3 and 43 K

Abstract

Microcrystals of orthorhombic nickel (II) oxalate dihydrate were synthesized through a precipitation reaction of aqueous solutions of nickel chloride and oxalic acid. Magnetic susceptibility exhibits a sharp peak at 3.3 K and a broadrounded maximum near 43 K. We associated the lower maximum with a metamagnetic transition that occurs when the magnetic field is about \geq 3.5 T. The maximum at 43 K is the typical of 1D antiferromagnets, whereas weak ferromagnetism behavior was observed in the range of 3.3 to 43 K.