Spin ladder compound Pb0.55 Cd0.45 V2 O5: Synthesis and investigation

Alexander A. Tsirlin, Roman V. Shpanchenko, Evgeny V. Antipov, Catherine Bougerol, Joke Hadermann, Gustaaf Van Tendeloo, Walter Schnelle, Helge Rosner

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Abstract

The complex oxide Pb0.55 Cd0.45 V2 O5 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 M V2 O5 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 Δ≈270 K and a spin singlet ground state. Band structure calculations suggest Pb0.55 Cd0.45 V2 O5 to be a system of weakly coupled dimers in perfect agreement with the experimental data. Pb0.55 Cd0.45 V2 O5 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 M V2 O5 -type oxides are established and discussed.

Original languageEnglish
Article number104429
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume76
Issue number10
DOIs
Publication statusPublished - 25 Sep 2007
Externally publishedYes

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