Who
Boqun Song, Iowa State University
Abstract
The speaker will present a concept, namely hetero-crystal materials, associated with new dimensions for tuning material properties. Distinct from surface-growing hetero-structures, the hetero-crystals are defined as bulk materials, which consist of layered skeleton structures and A-B stacking layers of hetero-cations. Varying the cation species leads to significant changes of symmetry and other parameters, granting an exceptional chance to manipulate spin textures, superconductivity, half- collapsing phases, etc. The recently discovered 1144-phase is chosen as a case study to demonstrate its stability, unique features and intimate links with different research interests.
The second part of the talk is about a phenomenon taking place in such systems (1144-phase KCaFe4As4): mutual induction of Superconductivity (SC) and anti-ferromagnetism (AF). The discovering line is similar to E-F fields. Faraday discovers the law of mutual induction for E-B fields; Maxwell equations reveal the Lorentz symmetry hidden underneath. In a similar vein, our work demonstrates that SC and SVC orders could induce each other (two-way) in generic situations (pure-SC, pure-AF, coexisting). The equation of motion reveals the symmetry imposed on them. That is to say, SC-AF could belong to the components of a single unified order parameter. Noteworthy, cuprate superconductors manifest similar features in previous studies, and this discovery may shed light on broader range of questions.
The second part of the talk is about a phenomenon taking place in such systems (1144-phase KCaFe4As4): mutual induction of Superconductivity (SC) and anti-ferromagnetism (AF). The discovering line is similar to E-F fields. Faraday discovers the law of mutual induction for E-B fields; Maxwell equations reveal the Lorentz symmetry hidden underneath. In a similar vein, our work demonstrates that SC and SVC orders could induce each other (two-way) in generic situations (pure-SC, pure-AF, coexisting). The equation of motion reveals the symmetry imposed on them. That is to say, SC-AF could belong to the components of a single unified order parameter. Noteworthy, cuprate superconductors manifest similar features in previous studies, and this discovery may shed light on broader range of questions.
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