Spin ladder compound Pb(0.55)Cd(0.45)V(2)O(5): synthesis and investigation

TL;DR

This study synthesizes and investigates Pb(0.55)Cd(0.45)V(2)O(5), revealing a spin gap and singlet ground state, and demonstrates how cation substitution modifies the spin system in layered vanadium oxides.

Contribution

It provides the first synthesis and detailed investigation of Pb(0.55)Cd(0.45)V(2)O(5), showing how cation substitution affects its magnetic properties and spin system.

Findings

Exhibits a spin gap of ~270 K and a spin singlet ground state.

Band structure indicates weakly coupled dimers.

Cation substitution modifies the spin system in layered vanadium oxides.

Abstract

The complex oxide Pb(0.55)Cd(0.45)V(2)O(5) was synthesized and investigated by means of X-ray powder diffraction, electron diffraction, magnetic susceptibility measurements and band structure calculations. Its structure is similar to that of MV(2)O(5) compounds (M = Na, Ca) giving rise to a spin system of coupled S=1/2 two-leg ladders. Magnetic susceptibility measurements reveal a spin gap-like behavior with \Delta ~ 270 K and a spin singlet ground state. Band structure calculations suggest Pb(0.55)Cd(0.45)V(2)O(5) to be a system of weakly coupled dimers in perfect agreement with the experimental data. Pb(0.55)Cd(0.45)V(2)O(5) provides an example of the modification of the spin system in layered vanadium oxides by cation substitution. Simple correlations between the cation size, geometrical parameters and exchange integrals for the MV(2)O(5)-type oxides are established and discussed.