Strain engineering of the charge and spin-orbital interactions in Sr 2 IrO 4
| العنوان: | Strain engineering of the charge and spin-orbital interactions in Sr 2 IrO 4 |
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| المؤلفون: | Ekaterina M. Pärschke, Wenliang Zhang, Mary Upton, Eugenio Paris, Thorsten Schmitt, Yi Tseng, Zhiming Wang, Anna Efimenko, Katharina Rolfs, Daniel McNally, Laura Maurel, Krzysztof Wohlfeld, Christof W. Schneider, Ekaterina Pomjakushina, Muntaser Naamneh, Vladimir N. Strocov, Diego Casa, Milan Radovic, Marco Caputo |
| المصدر: | Proceedings of the National Academy of Sciences of the United States of America, 117 (40) 'Proceedings of the National Academy of Sciences of the USA ', vol: 117, pages: 24764-24770 (2020) Proceedings of the National Academy of Sciences |
| بيانات النشر: | Proceedings of the National Academy of Sciences, 2020. |
| سنة النشر: | 2020 |
| مصطلحات موضوعية: | Resonant inelastic X-ray scattering, FOS: Physical sciences, 02 engineering and technology, Strain engineering, Spin–orbit coupling, Magnetoelastic coupling, Elementary excitations, 01 natural sciences, Condensed Matter - Strongly Correlated Electrons, Atomic orbital, 0103 physical sciences, 010306 general physics, Anisotropy, Physics, Multidisciplinary, Strongly Correlated Electrons (cond-mat.str-el), Condensed matter physics, Magnetic moment, Scattering, Spin–orbit interaction, 021001 nanoscience & nanotechnology, Condensed Matter::Strongly Correlated Electrons, 0210 nano-technology, Ground state |
| الوصف: | 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 t2g 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. Proceedings of the National Academy of Sciences of the United States of America, 117 (40) ISSN:0027-8424 ISSN:1091-6490 |
| وصف الملف: | application/application/pdf; application/pdf |
| تدمد: | 1091-6490 0027-8424 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8a110dae59076e0064f3f53946dc7e7d https://doi.org/10.1073/pnas.2012043117 |
| حقوق: | OPEN |
| رقم الأكسشن: | edsair.doi.dedup.....8a110dae59076e0064f3f53946dc7e7d |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 10916490 00278424 |
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