Nanoscale Layering of Antiferromagnetic and Superconducting Phases in Rb2Fe4Se5 
Single Crystals

Charnukha, A.; Cvitkovic, A.; Prokscha, T.; Pröpper, D.; Ocelic, N.; Suter, A.; Salman, Z.; Morenzoni, E.; Deisenhofer, J.; Tsurkan, V.; Loidl, A.; Keimer, B.; Boris, A. V.

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Nanoscale Layering of Antiferromagnetic and Superconducting Phases in Rb₂Fe₄Se₅ Single Crystals

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Keimer, B.
Department Solid State Spectroscopy (Bernhard Keimer), Max Planck Institute for Solid State Research, Max Planck Society;

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Boris, A. V.
Department Solid State Spectroscopy (Bernhard Keimer), Max Planck Institute for Solid State Research, Max Planck Society;

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Citation

Charnukha, A., Cvitkovic, A., Prokscha, T., Pröpper, D., Ocelic, N., Suter, A., et al. (2012). Nanoscale Layering of Antiferromagnetic and Superconducting Phases in Rb₂Fe₄Se₅ Single Crystals. Physical Review Letters, 109(1): 017003.

Cite as: https://hdl.handle.net/21.11116/0000-000E-C37B-C

Abstract

We studied phase separation in the single-crystalline antiferromagnetic superconductor Rb2Fe4Se5 (RFS) using a combination of scattering-type scanning near-field optical microscopy and low-energy muon spin rotation (LE-mu SR). We demonstrate that the antiferromagnetic and superconducting phases segregate into nanometer-thick layers perpendicular to the iron-selenide planes, while the characteristic in-plane size of the metallic domains reaches 10 mu m. By means of LE-mu SR we further show that in a 40-nm thick surface layer the ordered antiferromagnetic moment is drastically reduced, while the volume fraction of the paramagnetic phase is significantly enhanced over its bulk value. Self-organization into a quasiregular heterostructure indicates an intimate connection between the modulated superconducting and antiferromagnetic phases.