Discovery of a new type of magnetic order on pyrochlore spinels
| Autor: | SungBin Lee, GiBaik Sim |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Physics
Condensed matter physics Spin states media_common.quotation_subject Mott insulator Geometrical frustration Frustration 02 engineering and technology Spin–orbit interaction 021001 nanoscience & nanotechnology 01 natural sciences 0103 physical sciences Spin model Condensed Matter::Strongly Correlated Electrons 010306 general physics 0210 nano-technology Orbital magnetization Spin-½ media_common |
| Zdroj: | Physical Review B. 98 |
| ISSN: | 2469-9969 2469-9950 |
| DOI: | 10.1103/physrevb.98.014423 |
| Popis: | Frustration in spin system can give rise to unique ordered states and as a consequence several physical phenomena are expected such as multiferroics, high temperature superconductors and anomalous hall effect. Here we report the "new magnetic orders" induced by anisotropic spin exchanges on pyrochlore spinels as the interplay of spin orbit coupling and geometrical frustration. Due to complicated superexchange paths of B-site spinels, we claim that anisotropic interaction between next-nearest neighbors play an important role. Based on the systematic studies of generic spin model, we argue that several classical spin states can be explored in spinel systems; local XY state, all-in all-out state, Palmer-Chalker state and coplanar spiral state. In addition, we reveal new types of magnetic phases with finite ordering wavevectors, labeled as 'octagonal (prism)' state and '(distorted) cubic' states. When the 'octagonal prism' state is stabilized, non-zero scalar spin chirality induces alternating net current in addition to finite orbital current and orbital magnetization even in Mott insulators. Finally, we also discuss the relevance of 'distorted cubic' state to the magnetic order of spinel compound GeCo2O4. |
| Databáze: | OpenAIRE |
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