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arXiv 1605.06352cond-mat.str-el
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Fe掺杂Ca2RuO4的磁化反转和负体积热膨胀

Magnetization reversal and negative volume thermal expansion in Fe doped Ca2RuO4

S. J. Yuan, T. F. Qi, J. Terzic, Hao Zheng, Zhao Zhao, Songxue Chi, Feng Ye, Hua Wei, S. Parkin, Xuerong Liu, Wendy L. Mao, G. Cao

摘要:

本文报道了Ca_2 Ru_(1-x)Fe_xO_4(0<x<0.20)单晶的物理和结构性质随温度、磁场和压力的变化。Ca 2 RuO 4是一种结构驱动的莫特绝缘体,在TMI = 357 K时发生了金属-绝缘体(MI)转变,与TN = 110 K时的反铁磁有序很好地分离。Fe取代Ca_2 RuO_4中的Ru引起明显的磁化反转和巨大的负体积热膨胀(NVTE)。的磁化反转是场诱导的反铁磁耦合之间的Ru-和Fe-磁性亚晶格,具有不同的温度依赖性的结果。NVTE与正交畸变密切相关,并且由于Fe掺杂或施加压力而随着正交性减弱而变小。这项研究突出了晶格,轨道和自旋自由度之间有趣的相互作用,这是Ca 2 RuO 4中新现象的根源。

英文摘要:

We report physical and structural properties of single-crystal Ca2Ru1-xFexO4 (0<x<0.20) as functions of temperature, magnetic field and pressure. Ca2RuO4 is a structurally-driven Mott insulator with a metal-insulator (MI) transition at TMI = 357 K, which is well separated from antiferromagnetic order at TN = 110 K. Fe substitution for Ru in Ca2RuO4 causes a pronounced magnetization reversal and giant negative volume thermal expansion (NVTE). The magnetization reversal is a result of a field-induced antiferromagnetic coupling between the Ru- and Fe-magnetic sublattices that have different temperature dependence. The NVTE is closely associated with the orthorhombic distortion, and becomes smaller as the orthorhombicity weakens due to either Fe doping or application of pressure. The study highlights an intriguing interplay between lattice, orbital and spin degrees of freedom that is at the root of the novel phenomena in Ca2RuO4.

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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