A critical point in Sr2-IrO4 and less distorted IrO6 octahedra induced by deep Sr-vacancies
| Autor: | Wei Xu, S. L. Liu, Haiyun Wang, Yu Wang, Bin Li, Jie Cheng, Chaomin Zhu |
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| Rok vydání: | 2017 |
| Předmět: |
X-ray absorption spectroscopy
Magnetic structure Condensed matter physics Absorption spectroscopy Extended X-ray absorption fine structure Chemistry Mechanical Engineering 02 engineering and technology Electronic structure 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences XANES X-ray absorption fine structure Mechanics of Materials Critical point (thermodynamics) 0103 physical sciences General Materials Science 010306 general physics 0210 nano-technology |
| Zdroj: | Materials Research Bulletin. 90:1-7 |
| ISSN: | 0025-5408 |
| DOI: | 10.1016/j.materresbull.2017.02.013 |
| Popis: | For the Sr 2- x IrO 4 system, recent work pointed out the abnormal electronic and magnetic properties around a critical point. Here, to understand Sr-vacancy effect on spin-orbit coupled Mott insulator Sr 2 IrO 4 , the electronic structure and local structure distortion for Sr 2- x IrO 4 system have been investigated by x-ray absorption spectroscopy (XAS). By comparing the intensity of white-line features at the Ir L 2,3 -edge x-ray absorption near-edge spectroscopy (XANES), we observe a sudden rise of the branching ratio in the vicinity of the critical point. Further analysis on the Ir L 3 -edge extended x-ray absorption fine structure (EXAFS) and calculated data demonstrated that the abrupt enhancement of the branching ratio is intimately related to the less distorted IrO 6 octahedra induced by deep Sr-vacancies, which in turn alters the relatively strength of the spin-orbit coupling (SOC) and crystal electric field (CEF) that would dictate the abnormal behavior of electronic and magnetic structure near the critical point. |
| Databáze: | OpenAIRE |
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