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Triplet dimerization crossover driven by magnetic frustration in In_2VO_5

机译:In_2VO_5中的磁阻效应驱动的三重态二聚化交叉

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摘要

In_2VO_5, containing magnetically frustrated zigzag chains, shows a remarkable crossover at 120 K between paramagnetic states with positive (17 K) and negative (-70 K) Weiss temperatures. Magnetic moment and entropy data show that the V~(4+) S= 1/2 spins condense into S= 1 triplet dimers below the crossover. A further freezing of the antiferromagnetically coupled triplet dimers into a global singlet state is observed at 2.5 K, with no long range magnetic order down to 0.42 K and in fields up to 9 T. No structural V-V dimerization is observed by high-resolution synchrotron x-ray diffraction down to 10 K, but a subtle lattice anomaly evidences a spin-lattice coupling in the triplet dimer state. This is assigned to longitudinal oxygen displacement modes that reduce frustration within the chains and so couple to the spin dimer fluctuations.
机译:In_2VO_5包含受磁挫折曲折的锯齿形链,在Weiss温度为正(17 K)和负(-70 K)的顺磁状态下,在120 K处表现出显着的交叉。磁矩和熵数据表明,V〜(4+)S = 1/2自旋在交叉点以下会聚为S = 1个三重态二聚体。在2.5 K下观察到反铁磁耦合的三重态二聚体进一步冻结成整体单重态,在低至0.42 K且磁场高达9 T的情况下,没有长程磁阶。高分辨率同步加速器x观察不到结构VV二聚化射线衍射低至10 K,但微妙的晶格异常表明在三重二聚体状态下自旋-晶格耦合。这被分配给纵向氧气置换模式,该模式减少了链内的挫败感,因此耦合到了自旋二聚体的起伏。

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