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arXiv 1810.04092cond-mat.str-el
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La和Rh掺杂Sr3Ir2O7的相干和非相干带

Coherent and incoherent bands in La and Rh doped Sr3Ir2O7

V. Brouet, L. Serrier-Garcia, A. Louat, L. Fruchter, F. Bertran, P. Le Fevre, J. Rault, A Forget, D. Colson

摘要:

在Sr 2 IrO 4和Sr 3 Ir 2 O 7中,相关性、磁性和自旋轨道耦合在类似的能量尺度上竞争,为研究金属-绝缘体转变(MIT)创造了新的背景。我们在这里使用角度分辨光电发射研究MIT作为一个功能的空穴和电子掺杂Sr 3 Ir 2 O 7,分别获得Ir/Rh和Sr/La取代。我们发现,有一个明显的减少作为掺杂的费米能级的两侧,从0.2eV到0.05eV的上下带之间的间隙的函数。虽然这两个能带在能带结构计算中具有对应物,但它们的特征在于非常不同的相干程度。上带具有清晰的准粒子峰,而下带是非常宽的,并失去重量作为掺杂的函数。此外,他们的ARPES谱权重服从不同的周期性,加强了他们的不同性质的想法。我们认为,一个非常相似的情况发生在Sr 2 IrO 4和结论,这两个家庭的物理本质上是相同的。

英文摘要:

In Sr2IrO4 and Sr3Ir2O7, correlations, magnetism and spin-orbit coupling compete on similar energy scales, creating a new context to study metal-insulator transitions (MIT). We use here Angle-Resolved photoemission to investigate the MIT as a function of hole and electron doping in Sr3Ir2O7, obtained respectively by Ir/Rh and Sr/La substitutions. We show that there is a clear reduction as a function of doping of the gap between a lower and upper band on both sides of the Fermi level, from 0.2eV to 0.05eV. Although these two bands have a counterpart in band structure calculations, they are characterized by a very different degree of coherence. The upper band exhibits clear quasiparticle peaks, while the lower band is very broad and loses weight as a function of doping. Moreover, their ARPES spectral weights obey different periodicities, reinforcing the idea of their different nature. We argue that a very similar situation occurs in Sr2IrO4 and conclude that the physics of the two families is essentially the same.

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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