Skyrmionic chains and lattices in s+id superconductors
| Autor: | Milorad V. Milošević, Yan-Yan Zhang, Ling-Feng Zhang, Shi-Ping Zhou, Guo-Qiao Zha |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Superconductivity
Physics Condensed matter physics Condensed Matter - Superconductivity Skyrmion FOS: Physical sciences 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Vortex Magnetic field Superconductivity (cond-mat.supr-con) Condensed Matter::Superconductivity Pairing Lattice (order) 0103 physical sciences Symmetry breaking 010306 general physics 0210 nano-technology Topological quantum number |
| Zdroj: | Physical review B |
| ISSN: | 2469-9969 2469-9950 |
| DOI: | 10.1103/physrevb.101.064501 |
| Popis: | We report characteristic vortex configurations in $s+id$ superconductors with time reversal symmetry breaking, exposed to magnetic field. A vortex in the $s+id$ state tends to have an opposite phase winding between $s-$ and $d-$wave condensates. We find that this peculiar feature together with the competition between $s-$ and $d-$wave symmetry results in three distinct classes of vortical configurations. When either $s-$ or $d-$ condensate absolutely dominates, vortices form a conventional lattice. However, when one condensate is relatively dominant, vortices organize in chains that exhibit skyrmionic character, separating the chiral components of the $s \pm id$ order parameter into domains within and outside the chain. Such skyrmionic chains are found stable even at high magnetic field. When $s-$ and $d-$ condensates have a comparable strength, vortices split cores in two chiral components to form full-fledged skyrmions, i.e. coreless topological structures with an integer topological charge, organized in a lattice. We provide characteristic magnetic field distributions of all states, enabling their identification in e.g. scanning Hall probe and scanning SQUID experiments. These unique vortex states are relevant for high-T$_c$ cuprate and iron-based superconductors, where the relative strength of competing pairing symmetries is expected to be tuned by temperature and/or doping level, and can help distinguish $s+is$ and $s+id$ superconducting phases. 13 pages, 7 figures |
| Databáze: | OpenAIRE |
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