Frustration-driven C 4 symmetric order in a naturally-heterostructured superconductor Sr2VO3FeAs

Jong Mok Ok, S.-H. Baek (), C. Hoch, R. K. Kremer, S. Y. Park, Sungdae Ji, B. Büchner, J.-H. Park, S. I. Hyun, J. H. Shim, Yunkyu Bang, E. G. Moon, I. I. Mazin and Jun Sung Kim ()
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Jong Mok Ok: Pohang University of Science and Technology
S.-H. Baek: IFW Dresden
C. Hoch: Max-Planck-Institut für Festkörperforschung
R. K. Kremer: Max-Planck-Institut für Festkörperforschung
S. Y. Park: Pohang University of Science and Technology
Sungdae Ji: Pohang University of Science and Technology
B. Büchner: IFW Dresden
J.-H. Park: Pohang University of Science and Technology
S. I. Hyun: Pohang University of Science and Technology
J. H. Shim: Pohang University of Science and Technology
Yunkyu Bang: Chonnam National University
E. G. Moon: Korea Advanced Institute of Science and Technology
I. I. Mazin: Naval Research Laboratory code 6390
Jun Sung Kim: Pohang University of Science and Technology

Nature Communications, 2017, vol. 8, issue 1, 1-7

Abstract: 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 75As and 51V nuclear magnetic resonance measurements, we investigate an electronic phase that emerges in the FeAs layer below T 0 ~ 155 K of Sr2VO3FeAs, a naturally assembled heterostructure of an FeSC and a Mott-insulating 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.

Date: 2017
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DOI: 10.1038/s41467-017-02327-0

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