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Frustration-driven C4 symmetric order in a naturally-heterostructured superconductor Sr2VO3FeAs

MPG-Autoren
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Hoch,  C.
Former Departments, Max Planck Institute for Solid State Research, Max Planck Society;

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Kremer,  R. K.
Former Scientific Facilities, Max Planck Institute for Solid State Research, Max Planck Society;

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Zitation

Ok, J., Baek, S., Hoch, C., Kremer, R. K., Park, S., Ji, S., et al. (2017). Frustration-driven C4 symmetric order in a naturally-heterostructured superconductor Sr2VO3FeAs. Nature Communications, 8: 2167.


Zitierlink: https://hdl.handle.net/21.11116/0000-000E-D04A-4
Zusammenfassung
A subtle balance between competing interactions in iron-based superconductors (FeSCs) can be tipped by additional interfacial interactions in a heterostructure, often inducing exotic phases with unprecedented properties. Particularly when the proximity-coupled layer is magnetically active, rich phase diagrams are expected in FeSCs, but this has not been explored yet. Here, using high-accuracy As-75 and V-51 nuclear magnetic resonance measurements, we investigate an electronic phase that emerges in the FeAs layer below T-O similar to 155 K of Sr2VO3FeAs, a naturally assembled heterostructure of an FeSC and a Mottinsulating vanadium oxide. We find that frustration of the otherwise dominant Fe stripe and V Neel fluctuations via interfacial coupling induces a charge/orbital order in the FeAs layers, without either static magnetism or broken C-4 symmetry, while suppressing the Neel antiferromagnetism in the SrVO3 layers. These findings demonstrate that the magnetic proximity coupling stabilizes a hidden order in FeSCs, which may also apply to other strongly correlated heterostructures.