Strain engineering of the charge and spin-orbital interactions in Sr2IrO4
文献类型：期刊论文
| 作者 | Paris, Eugenio; Tseng, Yi; Paerschke, Ekaterina M.; Zhang, Wenliang; Upton, Mary H.; Efimenko, Anna; Rolfs, Katharina; McNally, Daniel E.; Maurel, Laura; Naamneh, Muntaser |
| 刊名 | PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
 |
| 出版日期 | 2020 |
| 卷号 | 117期号:40页码:24764-24770 |
| DOI | 10.1073/pnas.2012043117 |
| 英文摘要 | In the high spin-orbit-coupled Sr2IrO4, the high sensitivity of the ground state to the details of the local lattice structure shows a large potential for the manipulation of the functional properties by inducing local lattice distortions. We use epitaxial strain to modify the Ir-O bond geometry in Sr2IrO4 and perform momentum dependent resonant inelastic X-ray scattering (RIXS) at the metal and at the ligand sites to unveil the response of the low-energy elementary excitations. We observe that the pseudospin-wave dispersion for tensile-strained Sr2IrO4 films displays large softening along the [h,0] direction, while along the [h,h] direction it shows hardening. This evolution reveals a renormalization of the magnetic interactions caused by a strain-driven cross-over from anisotropic to isotropic interactions between the magnetic moments. Moreover, we detect dispersive electron-hole pair excitations which shift to lower (higher) energies upon compressive (tensile) strain, manifesting a reduction (increase) in the size of the charge gap. This behavior shows an intimate coupling between charge excitations and lattice distortions in Sr2IrO4, originating from the modified hopping elements between the t(2g) orbitals. Our work highlights the central role played by the lattice degrees of freedom in determining both the pseudospin and charge excitations of Sr2IrO4 and provides valuable information toward the control of the ground state of complex oxides in the presence of high spin-orbit coupling. |
| 学科主题 | Science & Technology - Other Topics |
| 源URL | [http://ir.nimte.ac.cn/handle/174433/20435]  |
| 专题 | 2020专题 2020专题_期刊论文 |
| 作者单位 | 1.Schmitt, T (corresponding author), Paul Scherrer Inst, Photon Sci Div, CH-5232 Villigen, Switzerland. 2.Paris, E |
| 推荐引用方式 GB/T 7714 | Paris, Eugenio,Tseng, Yi,Paerschke, Ekaterina M.,et al. Strain engineering of the charge and spin-orbital interactions in Sr2IrO4[J]. PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,2020,117(40):24764-24770. |
| APA | Paris, Eugenio.,Tseng, Yi.,Paerschke, Ekaterina M..,Zhang, Wenliang.,Upton, Mary H..,...&Schmitt, Thorsten.(2020).Strain engineering of the charge and spin-orbital interactions in Sr2IrO4.PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,117(40),24764-24770. |
| MLA | Paris, Eugenio,et al."Strain engineering of the charge and spin-orbital interactions in Sr2IrO4".PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA 117.40(2020):24764-24770. |
入库方式： OAI收割
来源：宁波材料技术与工程研究所
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