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arXiv 2103.03056cond-mat.str-el
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Rh和Ru掺杂Sr2IrO4电子结构差异的原因

Origin of the different electronic structure of Rh- and Ru-doped Sr2IrO4

Véronique Brouet, Paul Foulquier, Alex Louat, François Bertran, Patrick Le Fèvre, Julien E. Rault, Dorothée Colson

摘要:

在自旋-轨道莫特绝缘体Sr 2 IrO 4中诱导绝缘体到金属转变的一种方法是用过渡金属(Ru、Rh)取代铱。然而,这产生了有趣的非均匀金属态,这不能用简单的掺杂效应来描述。我们详细的Ru掺杂的情况下与角分辨光电发射的电子结构,并表明,相反,Rh,它不能连接到未掺杂的情况下,由一个刚性的位移。我们进一步确定以下的带$E_F$共存的金属的,我们分配到非键合Ir网站。我们合理化Rh和Ru之间的差异,通过不同的杂交与氧,介导耦合到Ir和敏感地影响有效掺杂。我们认为自旋轨道耦合既不控制电荷转移也不控制跃迁阈值。

英文摘要:

One way to induce insulator to metal transitions in the spin-orbit Mott insulator Sr2IrO4 is to substitute iridium with transition metals (Ru, Rh). However, this creates intriguing inhomogeneous metallic states, which cannot be described by a simple doping effect. We detail the electronic structure of the Ru-doped case with angle-resolved photoemission and show that, contrary to Rh, it cannot be connected to the undoped case by a rigid shift. We further identify bands below $E_F$ coexisting with the metallic ones that we assign to non-bonding Ir sites. We rationalize the differences between Rh and Ru by a different hybridization with oxygen, which mediates the coupling to Ir and sensitively affects the effective doping. We argue that the spin-orbit coupling does not control neither the charge transfer nor the transition threshold.

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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