Influence of Electron Doping on the Ground State of (Sr1-xLax)2IrO4

Published

August 17, 2015

Author(s)

Xiang Chen, Tom Hogan, D. Walkup, Wenwen Zhou, M. Pokharel, Mengliang Yao, Wei Tian, Thomas Z. Ward, Yang Zhao, Daniel E. Parshall, C. Opeil, Jeffrey W. Lynn, Vidya Madhavan, Stephen D. Wilson

Abstract

The evolution of the electronic properties of electron-doped (Sr_1-xLa_x)₂IrO₄ is experimentally explored as the solubility limit of La is approached. As electrons are introduced, the electronic ground state transitions from a spin-orbit Mott phase into an electronically phase separated state, where long-range magnetic order vanishes beyond x = 0.02 and charge transport remains percolative up to the solubility limit. In particular, the electronic ground state remains inhomogeneous even beyond the collapse of the parent state's long-range antiferromagnetic order, while persistent short-range magnetism survives up to the highest La-Substitution levels. Furthermore, as electrons are doped in Sr₂IrO₄, we observe the appearance of a low temperature state suggestive of a spin glass phase intermediate to the suppression of antiferromagnetic order. Universalities in the electron-doped phase diagrams of single layer and bilayer Ruddlesden-Popper strontium iridates are discussed.

Citation

Physical Review B

Volume

92

Issue

7

Pub Type

Journals

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Keywords

Iridates, spin-orbit interaction, neutron diffraction, STM, magnetization, doping

Citation

Chen, X. , Hogan, T. , Walkup, D. , Zhou, W. , Pokharel, M. , Yao, M. , Tian, W. , Ward, T. , Zhao, Y. , Parshall, D. , Opeil, C. , Lynn, J. , Madhavan, V. and Wilson, S. (2015), Influence of Electron Doping on the Ground State of (Sr_1-xLa_x)₂IrO₄, Physical Review B, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=918883 (Accessed April 26, 2024)