Magnetization distribution in a spin ladder-shaped quantum nanomagnet

TL;DR

This paper investigates the site-dependent magnetization in a finite quantum spin ladder with 12 spins, revealing non-uniform magnetization distributions influenced by temperature and magnetic field using exact diagonalization.

Contribution

It provides detailed calculations of site-specific magnetization in a quantum spin ladder, highlighting non-uniform behavior under varying conditions, which advances understanding of quantum nanomagnet properties.

Findings

Pronounced non-uniform magnetization across the ladder

Magnetization distributions depend on temperature and magnetic field

Site-specific magnetization varies with interaction parameters

Abstract

The quantum nanomagnets show interesting site-dependent magnetic properties as a function of the temperature and the external magnetic field. In the paper we present the results of calculations for a finite quantum spin ladder with two legs, consisting of 12 spins $S=1/2$. We describe our system with isotropic quantum Heisenberg model and perform exact numerical diagonalization of the Hamiltonian to use canonical ensemble approach. Our analysis focuses on the site-dependent magnetization in the system, presenting magnetization distributions for various interaction parameters. We discuss extensively the temperature and magnetic field dependences of individual site magnetizations. The interesting behaviour, with pronounced non-uniformity of magnetization across the ladder, is found.