Evidence of Nematicity in K0.8Fe1.7Se2

Chunruo Duan, Junjie Yang, Feng Ye, Despina Louca

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

It has been proposed that the superconducting state of K0.8Fe1.7Se2 is phase separated from a non-superconducting magnetic state. The results from a recent neutron diffraction study on a single crystal of K0.8Fe1.7Se2 provide evidence for a continuous transition between the I4/mmm high temperature phase in which the Fe vacancies are randomly distributed and the I4/m vacancy ordered phase in the temperature range between TC and TS. Upon cooling, the I4/m phase becomes more populated, increasing the (Formula presented.) superlattice structure, resulting in an enhancement of the (101) superlattice peak. The same temperature dependence is observed for the magnetic peak as well. Moreover, due to the Fe site splitting with the transition, its z-coordinate fluctuates, and so must the dxz and dyz orbitals. The orbital fluctuations couple to the magnetic ordering as seen here and may lead to a realization of nematic order in this system.

Original languageEnglish (US)
Pages (from-to)663-666
Number of pages4
JournalJournal of Superconductivity and Novel Magnetism
Volume29
Issue number3
DOIs
StatePublished - Mar 1 2016
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Keywords

  • Nematic phase
  • Neutron scattering
  • Superconductivity
  • Vacancies

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