Preferential quenching of 5d antiferromagnetic order in Sr3(Ir1-xMnx)2O7

Julian L. Schmehr, Eli Zoghlin, Zach Porter, Xiaoping Wang, Jacob P.C. Ruff, Wei Tian, Zahirul Islam, Stephen D. Wilson

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

The breakdown of Jeff = 1/2 antiferromagnetism in the limit of strong disorder is studied in Sr3(Ir1-xMnx)2O7. Upon Mn-substitution, antiferromagnetic ordering of the Ir cations becomes increasingly two-dimensional, resulting in the complete suppression of longrange Ir magnetic order above x ≈ 0.25. Long-range antiferromagnetism however persists on the Mn sites to higher Mn concentrations (x > 0.25) and is necessarily mediated via a random network of majority Ir sites. Our data suggest a shift in the Mn valence from Mn4+ to Mn3+ at intermediate doping levels, which in turn generates nonmagnetic Ir5+ sites and suppresses long-range order within the Ir network. The collapse of long-range Jeff = 1/2 antiferromagnetism and the survival of percolating antiferromagnetic order on Mn-sites demonstrates a complex 3d-5d exchange process that surprisingly enables minority Mn spins to order far below the conventional percolation threshold for a bilayer square lattice.

Original languageEnglish
Article number244003
JournalJournal of Physics Condensed Matter
Volume21
Issue number24
DOIs
StatePublished - 2019

Keywords

  • Antiferromagnetism
  • Iridate
  • Mott insulator
  • Neutron scattering
  • Resonant x-ray scattering
  • Spin-orbit coupling

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