Novel organic-inorganic layered oxide with spin ladder structure

TL;DR

This study reports a new layered manganese tungstate hybrid with a spin ladder structure, characterized by various techniques, and explores its magnetic properties, highlighting its potential for tuning magnetic interactions in hybrid materials.

Contribution

The paper introduces a novel organic-inorganic layered hybrid with a spin ladder structure and demonstrates how organic spacer length can tune magnetic interactions.

Findings

Manganese compound behaves like 1D antiferromagnetic chains.

Copper analogue fits a spin ladder model with specific exchange parameters.

Tunable inorganic layers via organic spacer length offers potential for studying spin systems.

Abstract

Structural analysis of a layered manganese tungstate diaminoalkane hybrid series suggests that this compound forms a spin-5/2 spin-ladder structure. We use X-ray diffraction, electron microscopy and x-ray absorption spectroscopy results to infer the structure. DC magnetization of the manganese compound and a possible copper analogue appear to show that the manganese system behaves like 1-dimensional antiferromagnetic Heisenberg chains (i.e. $J_{\parallel} \gg J_{\perp})$ while the copper system is fitted well by a $S = {1/2}$ spin ladder model, giving the parameters $g = 1.920 \pm 0.008$, $J_{\parallel}/k_B = -0.3 \pm 1.4$K; $J_{\perp}/k_B = 213.6 \pm 1.1$K. The ability to tune adjacent inorganic layers of the hybrid materials by altering the length of the organic `spacer' molecules gives enormous promise for the use of these materials, especially when doped, to provide a greater understanding of spin ladder systems.