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arXiv 2201.07297cond-mat.str-elcond-mat.mtrl-scicond-mat.othercond-mat.supr-con
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反铁磁RuO2中应变诱导轨道能移的共振弹性X射线散射研究

Strain-induced orbital energy shift in antiferromagnetic RuO2 revealed by resonant elastic x-ray scattering

Benjamin Gregory, Jörg Strempfer, Daniel Weinstock, Jacob Ruf, Yifei Sun, Hari Nair, Nathaniel J. Schreiber, Darrell G. Schlom, Kyle M. Shen, Andrej Singer

摘要:

长期以来,在其基态下,RuO 2被认为是一种普通的金属顺磁物质。最近的中子和X射线衍射表明,块体RuO 2是一个反铁磁体(AFM)与TN高于300 K。此外,外延应变诱导新的超导电性的薄膜的RuO 2低于2 K。在这里,我们提出了一个共振弹性X射线散射(REXS)研究在Ru L2边缘的应变RuO 2薄膜表现出应变诱导超导性。我们观察到一个方位角调制的100布拉格峰一致的倾斜AFM中发现散装。最值得注意的是,在显示出新型超导性的应变薄膜中,我们观察到Ru eg轨道向更高能量发生了~1 eV的位移。在较厚的松弛膜和具有不同应变方向的膜中,能量位移较小。我们的研究结果提供了进一步的证据的实用程序的外延应变作为一个调谐参数在复杂的氧化物。

英文摘要:

In its ground state, RuO2 was long thought to be an ordinary metallic paramagnet. Recent neutron and x-ray diffraction revealed that bulk RuO2 is an antiferromagnet (AFM) with TN above 300 K. Furthermore, epitaxial strain induces novel superconductivity in thin films of RuO2 below 2 K. Here, we present a resonant elastic x-ray scattering (REXS) study at the Ru L2 edge of the strained RuO2 films exhibiting the strain-induced superconductivity. We observe an azimuthal modulation of the 100 Bragg peak consistent with canted AFM found in bulk. Most notably, in the strained films displaying novel superconductivity, we observe a ~1 eV shift of the Ru eg orbitals to a higher energy. The energy shift is smaller in thicker, relaxed films and films with a different strain direction. Our results provide further evidence of the utility of epitaxial strain as a tuning parameter in complex oxides.

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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