Single crystals of superconducting SmFeAsO Hx: Structure and properties

A. Pisoni, S. Katrych, A. Arakcheeva, T. Verebélyi, M. Bokor, P. Huang, R. Gaál, P. Matus, J. Karpinski, L. Forró

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3 Citations (Scopus)

Abstract

We report the synthesis, structure, and superconducting properties of single crystals of SmFeAsOHx. The crystals were grown at high pressure and high temperature using a cubic anvil technique. H1-NMR studies confirm the presence of H atoms in the samples. Single crystal x-ray diffraction analyses demonstrate a remarkable disorder in the Sm2O2 layers induced by hydrogen incorporation and reveal that the H positions are compatible with a H2O-like geometry inside the crystals. We have measured the magnetotransport properties of SmFeAsOHx single crystals with x=0.07, 0.11, and 0.16 in magnetic field up to 16 T, oriented along the two main crystallographic directions. The results show an increase of the critical temperature with hydrogen content. The zero-temperature upper critical fields and the magnetic anisotropy are calculated as a function of the hydrogen content. SmFeAsOHx crystals present significantly higher upper critical fields and magnetic anisotropies compared to SmFeAsO1-xFx compounds.

Original languageEnglish
Article number024525
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume94
Issue number2
DOIs
Publication statusPublished - Jul 29 2016

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

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    Pisoni, A., Katrych, S., Arakcheeva, A., Verebélyi, T., Bokor, M., Huang, P., Gaál, R., Matus, P., Karpinski, J., & Forró, L. (2016). Single crystals of superconducting SmFeAsO Hx: Structure and properties. Physical Review B - Condensed Matter and Materials Physics, 94(2), [024525]. https://doi.org/10.1103/PhysRevB.94.024525