Probing Phosphorus Solubility and Its Effect on Critical Temperature (Tc) in the Helical Superconducting Magnet RbEuFe4As4-xPx

Mohammad Usman, Xiuquan Zhou, Christos D. Malliakas, Ulrich Welp, Wai Kwong Kwok, Duck Young Chung, Mercouri G. Kanatzidis*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

RbEuFe4As4 exhibits a rare combination of high-temperature superconductivity and noncollinear magnetism, originating from the FeAs and Eu layers, respectively. In order to fine-tune its superconducting and magnetic properties, we studied P-doped RbEuFe4As4-xPx. To determine the value of x for which RbEuFe4As4-xPx exists, members of the series have been synthesized in the form of relatively large-sized single crystals by a high-temperature flux growth technique using RbAs flux as well as polycrystalline powder by direct combination reactions between RbFe2As2 and EuFe2As2-xPx. The flux crystal growth reactions indicate that RbEuFe4As4-xPx forms with the values of x ≤ 0.12, which is corroborated by the Rietveld refinement analysis on the products obtained from direct combination reactions. The solubility limit exists primarily due to the preferential site As(2) occupation by P in the RbEuFe4As4 crystal structure.

Original languageEnglish (US)
Pages (from-to)8494-8501
Number of pages8
JournalChemistry of Materials
Volume35
Issue number20
DOIs
StatePublished - Oct 24 2023

ASJC Scopus subject areas

  • General Chemistry
  • General Chemical Engineering
  • Materials Chemistry

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