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- Title
Frustration-driven C<sub>4</sub> symmetric order in a naturally-heterostructured superconductor Sr<sub>2</sub>VO<sub>3</sub>FeAs.
- Authors
Jong Mok Ok; Baek, S. H.; Hoch, C.; Kremer, R. K.; Park, S. Y.; Sungdae Ji; Büchner, B.; Park, J. H.; Hyun, S. I.; Shim, J. H.; Yunkyu Bang; Moon, E. G.; Mazin, I. I.; Jun Sung Kim
- Abstract
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 75 As and 51V nuclear magnetic resonance measurements, we investigate an electronic phase that emerges in the FeAs layer below T0 ~ 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 C4 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.
- Subjects
IRON-based superconductors; ANTIFERROMAGNETISM; SUPERCONDUCTORS; NUCLEAR magnetic resonance; MAGNETIC measurements; VANADIUM oxide; MAGNETIC coupling
- Publication
Nature Communications, 2017, Vol 8, Issue 1, p1
- ISSN
2041-1723
- Publication type
Article
- DOI
10.1038/s41467-017-02327-0