Magnetism of the antiferromagnetic spin-$\frac{1}{2}$ tetramer compound CuInVO$_5$

TL;DR

This study investigates the magnetic properties of CuInVO$_5$, revealing antiferromagnetic order below 2.7 K and a quantum magnetization plateau at high fields, attributed to antiferromagnetic spin-$rac{1}{2}$ tetramers.

Contribution

It provides detailed experimental characterization and modeling of the spin interactions in CuInVO$_5$, identifying specific intratetramer exchange constants.

Findings

Antiferromagnetic order below 2.7 K.

Observation of a 1/2 magnetization plateau above 30 T.

Identification of antiferromagnetic spin-$rac{1}{2}$ tetramers with specific exchange interactions.

Abstract

We measured the temperature dependence of the magnetic susceptibility and specific heat and the magnetic-field dependence of the magnetization of CuInVO$_5$. An antiferromagnetically ordered state appears below $T_{\rm N} = 2.7$ K. We observed a $\frac{1}{2}$ quantum magnetization plateau above 30 T at 1.3 K. We show that the spin system consists of antiferromagnetic spin-$\frac{1}{2}$ tetramers with $J_1 = 240 \pm 20$ and $J_2 = -142 \pm 10$ K for the intratetramer interactions.