Electron-doped Sr 2IrO 4?δ (0<δ<0.04): Evolution of a disordered Jeff= 1/2 Mott insulator into an exotic metallic state

O. B. Korneta, Tongfei Qi, S. Chikara, S. Parkin, L. E. De Long, P. Schlottmann, G. Cao

Research output: Contribution to journalArticlepeer-review

107 Scopus citations

Abstract

Stoichiometric Sr 2IrO 4 is a ferromagnetic J eff = 1/2 Mott insulator driven by strong spin-orbit coupling. Introduction of very dilute oxygen vacancies into single-crystal Sr 2 IrO 4-δ with δ≤0.04 leads to significant changes in lattice parameters and an insulator-to-metal transition at T MI =105 K. The highly anisotropic electrical resistivity of the low-temperature metallic state for δ≈0.04 exhibits anomalous properties characterized by non-Ohmic behavior and an abrupt current-induced transition in the resistivity at T * =52K, which separates two regimes of resistive switching in the nonlinear I-V characteristics. The novel behavior illustrates an exotic ground state and constitutes a new paradigm for devices structures in which electrical resistivity is manipulated via low-level current densities ∼10mA/ cm 2 (compared to higher spin-torque currents ∼ 10 7 - 10 8 A/ cm 2) or magnetic inductions ∼0.1-1.0T.

Original languageEnglish
Article number115117
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume82
Issue number11
DOIs
StatePublished - Sep 17 2010

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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