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arXiv 1504.06901cond-mat.str-el
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Ca(Ir $_{1-x}$ Ru $_{x}$)O $_{3}$中磁涨落驱动的绝缘体-金属转变

Magnetic fluctuations driven insulator-to-metal transition in Ca(Ir$_{1-x}$Ru$_{x}$)O$_{3}$

J. Gunasekera, L. Harriger, A. Dahal, T. Heitmann, G. Vignale, D. K. Singh

摘要:

过渡金属氧化物中的磁涨落是深入研究的主题,因为它们被期望在这些材料从莫特绝缘体到非常规金属相的转变中发挥关键作用,并且还作为超导性的驱动器。尽管做了很多努力,磁波动和绝缘体到金属的转变之间的明确联系尚未建立。在这里,我们报告了Ca(Ir $_{1-x}$ Ru $_{x}$)O $_{3}$钙钛矿中磁波动与绝缘体至金属转变之间的令人信服的联系作为掺杂系数x的函数的发现。我们表明,当材料从绝缘体变成金属,在x $\sim$ 0.3的临界值,磁涨落改变其字符从反铁磁,一个莫特绝缘体相,铁磁,一个巡回电子状态与洪德的轨道耦合。这些结果对于我们理解强关联电子系统的非常规性质具有广泛的意义

英文摘要:

Magnetic fluctuations in transition metal oxides are a subject of intensive research because of the key role they are expected to play in the transition from the Mott insulator to the unconventional metallic phase of these materials, and also as drivers of superconductivity. Despite much effort, a clear link between magnetic fluctuations and the insulator-to-metal transition has not yet been established. Here we report the discovery of a compelling link between magnetic fluctuations and the insulator-to-metal transition in Ca(Ir$_{1-x}$Ru$_{x}$)O$_{3}$ perovskites as a function of the doping coefficient x. We show that when the material turns from insulator to metal, at a critical value of x$\sim$ 0.3, magnetic fluctuations change their character from antiferromagnetic, a Mott insulator phase, to ferromagnetic, an itinerant electron state with Hund's orbital coupling. These results are expected to have wide-ranging implications for our understanding of the unconventional properties of strongly correlated electrons systems

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