Ground-State Tuning of Metal-Insulator Transition by Compositional Variations in BaIr_1−xRu_xO₃ (0 ≤ x ≤ 1)

Authors

Shujuan Yuan, University of KentuckyFollow
Kamal H. Butrouna, University of KentuckyFollow
Jsaminka Terzic, University of KentuckyFollow
Hao Zheng, University of KentuckyFollow
Saicharan Aswartham, University of KentuckyFollow
Lance E. DeLong, University of KentuckyFollow
Feng Ye, Oak Ridge National Laboratory
P. Schlottmann, Florida State University
Gang Cao, University of KentuckyFollow

Abstract

Hexagonal BaIrO3 is a magnetic insulator driven by the spin-orbit interaction (SOI), whereas BaRuO₃ is an enhanced paramagnetic metal. Our investigation of structural, magnetic, transport, and thermal properties reveals that substitution of Ru⁴⁺ (4d⁴) ions for Ir⁴⁺ (5d⁵) ions in BaIrO₃ reduces the magnitudes of the SOI and a monoclinic structural distortion and rebalances the competition between the SOI and the lattice degrees of freedom to render an evolution from a magnetic insulting state to a robust metallic state. The central findings of this paper are as follows: (1) light Ru doping (0 < x ≤ 0.15) prompts simultaneous, precipitous drops in both the magnetic ordering temperature T_N and the electrical resistivity, and (2) heavier Ru doping (0.41 ≤ x ≤ 0.9) induces a robust metallic state without any long-range magnetic order. All results suggest a critical role of the lattice degrees of freedom in determining the ground state in the heavy transition-metal oxides.

Document Type

Article

Publication Date

4-25-2016

Notes/Citation Information

Published in Physical Review B, v. 93, issue 16, 165136, p. 1-5.

©2016 American Physical Society

The copyright holder has granted permission for posting the article here.

Digital Object Identifier (DOI)

https://doi.org/10.1103/PhysRevB.93.165136

Funding Information

This work was supported by the National Science Foundation via Grant No. DMR-1265162 (G.C.) and Departmentof Energy (BES) through Grants No. DE-FG02-98ER45707(P.S.) and No. DE-FG02-97ER45653 (L.E.D.).

Related Content

See Supplemental Material at https://journals.aps.org/prb/supplemental/10.1103/PhysRevB.93.165136 for substantial information on crystal refinements.

Repository Citation

Yuan, Shujuan; Butrouna, Kamal H.; Terzic, Jsaminka; Zheng, Hao; Aswartham, Saicharan; DeLong, Lance E.; Ye, Feng; Schlottmann, P.; and Cao, Gang, "Ground-State Tuning of Metal-Insulator Transition by Compositional Variations in BaIr_1−xRu_xO₃ (0 ≤ x ≤ 1)" (2016). Physics and Astronomy Faculty Publications. 445.
https://uknowledge.uky.edu/physastron_facpub/445