Magnetic order in ferromagnetically coupled spin ladders

TL;DR

This paper investigates the magnetic ordering in ferromagnetically coupled spin ladders using numerical methods, revealing specific peak behaviors in structure factors and implications for related magnetic materials and high-temperature superconductors.

Contribution

It provides new insights into the magnetic structure factors and correlations in ferromagnetically coupled spin ladders, relevant for understanding complex magnetic materials.

Findings

Peak in structure factor at (π,π/2) for ferromagnetic interladder coupling

Finite spin-spin correlations along ladders in the bulk limit for strong coupling

Relevance to magnetic compounds and high-Tc superconductor models

Abstract

A model of coupled antiferromagnetic spin-1/2 Heisenberg ladders is studied with numerical techniques. In the case of ferromagnetic interladder coupling we find that the dynamic and static structure factor has a peak at $(\pi,\pi/2)$ where the first (second) direction is along (transversal) to the ladders. Besides, we suggest that the intensity of this peak and the spin-spin correlation at the maximum distance along the ladder direction remain finite in the bulk limit for strong enough interladder coupling. We discuss the relevance of these results for magnetic compounds containing ladders coupled in a trellis lattice and for the stripe scenario in high-T$_c$ superconducting cuprates.