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首页> 外文期刊>Physical review >Ground state in the novel dimer iridate Ba_(13)Ir_6O_(30) with Ir~(6+)(5d~3) ions
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Ground state in the novel dimer iridate Ba_(13)Ir_6O_(30) with Ir~(6+)(5d~3) ions

机译:新型二聚体铱酸盐Ba_(13)Ir_6O_(30)与Ir〜(6 +)(5d〜3)离子的基态

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摘要

We have synthesized and studied an iridate, Ba13Ir6O30, with unusual Ir oxidation states: 2/3 Ir6+(5d(3)) ions and 1/3 Ir5+(5d(4)) ions. Its crystal structure features dimers of face-sharing IrO6 octahedra, and IrO6 monomers that are linked via long, zigzag Ir-O-Ba-O-Ir pathways. Nevertheless, Ba13Ir6O30 exhibits two transitions at T-N1 = 4.7K and T-N2 = 1.6K. This magnetic order is accompanied by a huge Sommerfeld coefficient 200 mJ/mole K-2 below T-N2, signaling a coexisting frustrated/disordered state persisting down to at least 0.05 K. This iridate hosts unusually large J(eff) = 3/2 degrees of freedom, which is enabled by strong spin-orbit interactions (SOI) in the monomers with Ir6+ ions and a joint effect of molecular orbitals and SOI in the dimers occupied by Ir5+ and Ir6+ ions. Features displayed by the magnetization and heat capacity suggest that the combination of covalency, SOI, and large effective spins leads to highly frustrated ferrimagnetic ordering, an interesting feature of this high-spin iridate.
机译:我们已经合成并研究了具有非常规Ir氧化态的铱酸盐Ba13Ir6O30:2/3 Ir6 +(5d(3))离子和1/3 Ir5 +(5d(4))离子。它的晶体结构具有面部共享的IrO6八面体的二聚体和通过长的锯齿状Ir-O-Ba-O-Ir路径连接的IrO6单体。尽管如此,Ba13Ir6O30在T-N1 = 4.7K和T-N2 = 1.6K处表现出两个跃迁。这种磁序伴随着T-​​N2以下200 mJ / mol K-2的巨大Sommerfeld系数,预示着共存的沮丧/无序状态持续低至至少0.05K。这种铱酸盐具有异常大的J(eff)= 3/2自由度,这是由于单体中与Ir6 +离子的强自旋轨道相互作用(SOI)以及Ir5 +和Ir6 +离子占据的二聚体中分子轨道和SOI的联合效应而实现的。磁化强度和热容量显示的特征表明,共价性,SOI和大的有效自旋的组合导致高度受挫的亚铁磁有序化,这是这种高旋转率的铱酸盐的有趣特征。

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  • 来源
    《Physical review》 |2019年第6期|64418.1-64418.7|共7页
  • 作者单位

    Univ Colorado Dept Phys Boulder CO 80309 USA;

    Oak Ridge Natl Lab Neutron Scattering Div POB 2009 Oak Ridge TN 37831 USA;

    Univ Colorado Dept Phys Boulder CO 80309 USA|North China Elect Power Univ Sch Math & Phys Beijing 102206 Peoples R China;

    Univ Colorado Dept Phys Boulder CO 80309 USA|Univ Colorado NIST JILA Boulder CO 80309 USA;

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