Neutron scattering study of correlated phase behavior in Sr 2IrO4

Chetan Dhital, Tom Hogan, Z. Yamani, Clarina De La Cruz, Xiang Chen, Sovit Khadka, Zhensong Ren, Stephen D. Wilson

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74 Scopus citations

Abstract

Neutron diffraction measurements exploring the magnetic and structural phase behaviors of the candidate Jeff=1/2 Mott insulating iridate Sr2IrO4 are presented. Comparisons are drawn between the correlated magnetism in this single-layer system and its bilayer analog Sr 3Ir2O7, where both materials exhibit magnetic domains originating from crystallographic twinning and comparable moment sizes. Weakly temperature-dependent superlattice peaks violating the reported tetragonal space group of Sr2IrO4 are observed, supporting the notion of a lower structural symmetry arising from a high-temperature lattice distortion, and we use this to argue that moments orient along a unique in-plane axis demonstrating an orthorhombic symmetry in the resulting spin structure. Our results demonstrate that the correlated spin order and structural phase behaviors in both single-layer and bilayer Srn+1Ir nO3n+1 systems are remarkably similar and suggest comparable correlation strengths in each system.

Original languageEnglish (US)
Article number144405
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume87
Issue number14
DOIs
StatePublished - Apr 8 2013
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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