Evolution of topological defects at two sequential phase transitions of Nd_{2}SrFe_{2}O_{7}
How topological defects, unavoidable at symmetry-breaking phase transitions in a wide range of systems, evolve through consecutive phase transitions with different broken symmetries remains unexplored. Nd_{2}SrFe_{2}O_{7}, a bilayer ferrite, exhibits two intriguing structural phase transitions and d...
| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
American Physical Society
2021-06-01
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| Series: | Physical Review Research |
| Online Access: | http://doi.org/10.1103/PhysRevResearch.3.023216 |
| _version_ | 1827285725377200128 |
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| author | Fei-Ting Huang Yanbin Li Fei Xue Jae-Wook Kim Lunyong Zhang Ming-Wen Chu Long-Qing Chen Sang-Wook Cheong |
| author_facet | Fei-Ting Huang Yanbin Li Fei Xue Jae-Wook Kim Lunyong Zhang Ming-Wen Chu Long-Qing Chen Sang-Wook Cheong |
| author_sort | Fei-Ting Huang |
| collection | DOAJ |
| description | How topological defects, unavoidable at symmetry-breaking phase transitions in a wide range of systems, evolve through consecutive phase transitions with different broken symmetries remains unexplored. Nd_{2}SrFe_{2}O_{7}, a bilayer ferrite, exhibits two intriguing structural phase transitions and dense networks of the so-called type II Z_{8} structural vortices at room temperature, so it is an ideal system to explore the topological defect evolution. From our extensive experimental investigation, we demonstrate that the cooling rate at the second-order transition (1290°C) plays a decisive role in determining the vortex density at room temperature, following the universal Kibble-Zurek mechanism. In addition, we discovered a transformation between topologically distinct vortices (Z_{8} to Z_{4} vortices) at the first-order transition (550°C), which conserves the number of vortex cores. Remarkably, the Z_{4} vortices consist of two phases with an identical symmetry but two distinct magnitudes of an order parameter. Furthermore, when lattice distortion is enhanced by chemical doping, an alternative type of topological defects emerges: loop domain walls with orthorhombic distortions in the tetragonal background, resulting in unique pseudo-orthorhombic twins. Our findings open an avenue to explore the evolution of topological defects through multiple phase transitions. |
| first_indexed | 2024-04-24T10:19:34Z |
| format | Article |
| id | doaj.art-88565107416d44af98215a1798d294f4 |
| institution | Directory Open Access Journal |
| issn | 2643-1564 |
| language | English |
| last_indexed | 2024-04-24T10:19:34Z |
| publishDate | 2021-06-01 |
| publisher | American Physical Society |
| record_format | Article |
| series | Physical Review Research |
| spelling | doaj.art-88565107416d44af98215a1798d294f42024-04-12T17:10:52ZengAmerican Physical SocietyPhysical Review Research2643-15642021-06-013202321610.1103/PhysRevResearch.3.023216Evolution of topological defects at two sequential phase transitions of Nd_{2}SrFe_{2}O_{7}Fei-Ting HuangYanbin LiFei XueJae-Wook KimLunyong ZhangMing-Wen ChuLong-Qing ChenSang-Wook CheongHow topological defects, unavoidable at symmetry-breaking phase transitions in a wide range of systems, evolve through consecutive phase transitions with different broken symmetries remains unexplored. Nd_{2}SrFe_{2}O_{7}, a bilayer ferrite, exhibits two intriguing structural phase transitions and dense networks of the so-called type II Z_{8} structural vortices at room temperature, so it is an ideal system to explore the topological defect evolution. From our extensive experimental investigation, we demonstrate that the cooling rate at the second-order transition (1290°C) plays a decisive role in determining the vortex density at room temperature, following the universal Kibble-Zurek mechanism. In addition, we discovered a transformation between topologically distinct vortices (Z_{8} to Z_{4} vortices) at the first-order transition (550°C), which conserves the number of vortex cores. Remarkably, the Z_{4} vortices consist of two phases with an identical symmetry but two distinct magnitudes of an order parameter. Furthermore, when lattice distortion is enhanced by chemical doping, an alternative type of topological defects emerges: loop domain walls with orthorhombic distortions in the tetragonal background, resulting in unique pseudo-orthorhombic twins. Our findings open an avenue to explore the evolution of topological defects through multiple phase transitions.http://doi.org/10.1103/PhysRevResearch.3.023216 |
| spellingShingle | Fei-Ting Huang Yanbin Li Fei Xue Jae-Wook Kim Lunyong Zhang Ming-Wen Chu Long-Qing Chen Sang-Wook Cheong Evolution of topological defects at two sequential phase transitions of Nd_{2}SrFe_{2}O_{7} Physical Review Research |
| title | Evolution of topological defects at two sequential phase transitions of Nd_{2}SrFe_{2}O_{7} |
| title_full | Evolution of topological defects at two sequential phase transitions of Nd_{2}SrFe_{2}O_{7} |
| title_fullStr | Evolution of topological defects at two sequential phase transitions of Nd_{2}SrFe_{2}O_{7} |
| title_full_unstemmed | Evolution of topological defects at two sequential phase transitions of Nd_{2}SrFe_{2}O_{7} |
| title_short | Evolution of topological defects at two sequential phase transitions of Nd_{2}SrFe_{2}O_{7} |
| title_sort | evolution of topological defects at two sequential phase transitions of nd 2 srfe 2 o 7 |
| url | http://doi.org/10.1103/PhysRevResearch.3.023216 |
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