Skip to main content
eScholarship
Open Access Publications from the University of California

Local Orthorhombicity in the Magnetic C4 Phase of the Hole-Doped Iron-Arsenide Superconductor Sr1-xNaxFe2As2

  • Author(s): Frandsen, BA
  • Taddei, KM
  • Yi, M
  • Frano, A
  • Guguchia, Z
  • Yu, R
  • Si, Q
  • Bugaris, DE
  • Stadel, R
  • Osborn, R
  • Rosenkranz, S
  • Chmaissem, O
  • Birgeneau, RJ
  • et al.
Abstract

© 2017 American Physical Society. We report on temperature-dependent pair distribution function measurements of Sr1-xNaxFe2As2, an iron-based superconductor system that contains a magnetic phase with reentrant tetragonal symmetry, known as the magnetic C4 phase. Quantitative refinements indicate that the instantaneous local structure in the C4 phase comprises fluctuating orthorhombic regions with a length scale of ∼2 nm, despite the tetragonal symmetry of the average static structure. Additionally, local orthorhombic fluctuations exist on a similar length scale at temperatures well into the paramagnetic tetragonal phase. These results highlight the exceptionally large nematic susceptibility of iron-based superconductors and have significant implications for the magnetic C4 phase and the neighboring C2 and superconducting phases.

Many UC-authored scholarly publications are freely available on this site because of the UC Academic Senate's Open Access Policy. Let us know how this access is important for you.

Main Content
Current View