Suppression of the superconducting transition of RFeAsO1-xFx (R=Tb, Dy, and Ho)

Jennifer A. Rodgers, George B. S. Penny, Andrea Marcinkova, Jan-Willem G. Bos, Dmitry A. Sokolov, Anna Kusmartseva, Andrew D. Huxley, J. Paul Attfield

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

A suppression of superconductivity in the late rare-earth RFeAsO1-xFx materials is reported. The maximum critical temperature (T-c) decreases from 51 K for R=Tb to 36 K for HoFeAsO0.9F0.1, which has been synthesized under 10 GPa pressure. This suppression is driven by a decrease in the Fe-As-Fe angle below an optimum value of 110.6 degrees, as the angle decreases linearly with unit-cell volume (V) across the RFeAsO1-xFx series. A crossover in electronic structure around this optimum geometry is evidenced by a change in sign of the compositional dT(c)/dV, from negative values for previously reported large R materials to positive for HoFeAsO0.9F0.1.

Original languageEnglish
Article number052508
Pages (from-to)-
Number of pages4
JournalPhysical review B
Issue number5
Publication statusPublished - Aug 2009

Keywords / Materials (for Non-textual outputs)

  • dysprosium compounds
  • electronic structure
  • Fermi level
  • high-pressure effects
  • holmium compounds
  • iron compounds
  • stoichiometry
  • superconducting transition temperature
  • superconducting transitions
  • terbium compounds
  • 43 K


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