Superconductivity and magnetism in Rb 0.8Fe 1.6Se 2 under pressure

Vadim Ksenofontov, Sergey A. Medvedev, Leslie M. Schoop, Gerhard Wortmann, Taras Palasyuk, Vladimir Tsurkan, Joachim Deisenhofer, Alois Loidl, Claudia Felser

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Abstract

High-pressure magnetization, structural, and 57Fe Mössbauer studies were performed on superconducting Rb 0.8Fe 1.6Se 2.0 with T c = 32.4 K. The gradual decrease of T c with increasing pressure up to 5 GPa is followed by a step-like suppression of superconductivity at higher pressures. No structural phase transition in the Fe vacancy-ordered superstructure is observed in synchrotron x-ray diffraction (XRD) studies up to 15.6 GPa. The Mössbauer spectra above 5 GPa reveal the appearance of a new paramagnetic phase, exhibiting magnetic order below 80 K, coinciding with the irreversible disappearance of superconductivity. We interpret these changes as due to a pressure-induced diffusion of Rb ions between the two phases, responsible for the antiferromagnetism and superconductivity in Rb 0.8Fe 1.6Se 2.0.

Original languageEnglish (US)
Article number214519
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume85
Issue number21
DOIs
StatePublished - Jun 19 2012
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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    Ksenofontov, V., Medvedev, S. A., Schoop, L. M., Wortmann, G., Palasyuk, T., Tsurkan, V., Deisenhofer, J., Loidl, A., & Felser, C. (2012). Superconductivity and magnetism in Rb 0.8Fe 1.6Se 2 under pressure. Physical Review B - Condensed Matter and Materials Physics, 85(21), [214519]. https://doi.org/10.1103/PhysRevB.85.214519