Lattice frustration in spin-orbit Mott insulator Sr3Ir2O7 at high pressure
| Autor: | Hongshan Deng, Youguo Shi, Xia Yin, Changjiang Yi, Yang Ding, Ho-kwang Mao, Bijuan Chen, Sorb Yesudhas, Zhenxian Liu, Ekaterina M. Pärschke, Dayu Yan, Raimundas Sereika, Jianbo Zhang, Hong Xiao, Cheng-Chien Chen, Jun Chang |
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| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Diffraction
Phase transition Materials science media_common.quotation_subject FOS: Physical sciences Frustration 02 engineering and technology Crystal structure lcsh:Atomic physics. Constitution and properties of matter 01 natural sciences Tetragonal crystal system Condensed Matter - Strongly Correlated Electrons Electrical resistance and conductance Lattice (order) 0103 physical sciences lcsh:TA401-492 010306 general physics media_common Condensed Matter - Materials Science Strongly Correlated Electrons (cond-mat.str-el) Condensed matter physics Mott insulator Materials Science (cond-mat.mtrl-sci) 021001 nanoscience & nanotechnology Condensed Matter Physics Electronic Optical and Magnetic Materials lcsh:QC170-197 lcsh:Materials of engineering and construction. Mechanics of materials Condensed Matter::Strongly Correlated Electrons 0210 nano-technology |
| Zdroj: | npj Quantum Materials, Vol 4, Iss 1, Pp 1-6 (2019) |
| Popis: | The intertwined charge, spin, orbital, and lattice degrees of freedom could endow 5d compounds with exotic properties. Current interest is focused on electromagnetic interactions in these materials, whereas the important role of lattice geometry remains to be fully recognized. For this sake, we investigate pressure-induced phase transitions in the spin-orbit Mott insulator Sr3Ir2O7 with Raman, electrical resistance, and x-ray diffraction measurements. We reveal an interesting magnetic transition coinciding with a structural transition at 14.4 GPa, but without a concurrent insulator-metal transition. The conventional correlation between magnetic and Mott insulating states is thereby absent. The observed softening of the one-magnon mode can be explained by a reduced tetragonal distortion, while the actual magnetic transition is associated with tilting of the IrO6 octahedra. This work highlights the critical role of lattice frustration in determining the high-pressure phases of Sr3Ir2O7. The ability to control electromagnetic properties via manipulating the crystal structure with pressure promises a new way to explore new quantum states in spin-orbit Mott insulators. 6 pages, 5 figures |
| Databáze: | OpenAIRE |
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