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arXiv 0710.1806cond-mat.str-elcond-mat.mtrl-sci
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自旋梯化合物Pb(0.55)Cd(0.45)V(2)O(5)的合成与研究

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

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

摘要:

合成了Pb(0.55)Cd(0.45)V(2)O(5)复合氧化物,并通过X射线粉末衍射、电子衍射、磁化率测量和能带结构计算对其进行了研究。它的结构与MV(2)O(5)化合物(M = Na,Ca)相似,形成一个S=1/2的双梯自旋系统。磁化率测量结果表明,在Δ~ 270 K时,样品具有自旋带隙性质,并具有自旋单重态基态.能带结构计算表明Pb(0.55)Cd(0.45)V(2)O(5)是一个弱耦合二聚体体系,与实验数据完全一致。Pb(0.55)Cd(0.45)V(2)O(5)提供了层状钒氧化物中自旋系统通过阳离子取代而改变的例子。MV(2)O(5)型氧化物的阳离子尺寸,几何参数和交换积分之间的简单的相关性建立和讨论。

英文摘要:

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 Δ~ 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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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