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Title: Spin-orbit tuned metal-insulator transitions in single-crystal Sr₂Ir 1–xRh xO₄ (0≤x≤1)

Abstract

Sr₂IrO₄ is a magnetic insulator driven by spin-orbit interaction (SOI) whereas the isoelectronic and isostructural Sr₂RhO₄ is a paramagnetic metal. The contrasting ground states have been shown to result from the critical role of the strong SOI in the iridate. Our investigation of structural, transport, magnetic, and thermal properties reveals that substituting 4d Rh⁴⁺ (4d⁵) ions for 5d Ir⁴⁺ (5d⁵) ions in Sr₂IrO₄ directly reduces the SOI and rebalances the competing energies so profoundly that it generates a rich phase diagram for Sr₂Ir 1–xRh xO₄ featuring two major effects: (1) Light Rh doping (0 ≤ x ≤ 0.16) prompts a simultaneous and precipitous drop in both the electrical resistivity and the magnetic ordering temperature TC, which is suppressed to zero at x = 0.16 from 240 K at x = 0. (2) However, with heavier Rh doping [0.24 < x < 0.85 (±0.05)] disorder scattering leads to localized states and a return to an insulating state with spin frustration and exotic magnetic behavior that only disappears near x = 1. The intricacy of Sr₂Ir 1–xRh xO₄ is further highlighted by comparison with Sr₂Ir 1–xRu xO₄ where Ru⁴⁺ (4d⁴) drives a direct crossover from the insulating to metallic states.

Authors:
; ; ; ; ; ; ; ;
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1103269
Resource Type:
Publisher's Accepted Manuscript
Journal Name:
Physical Review. B, Condensed Matter and Materials Physics
Additional Journal Information:
Journal Name: Physical Review. B, Condensed Matter and Materials Physics Journal Volume: 86 Journal Issue: 12; Journal ID: ISSN 1098-0121
Publisher:
American Physical Society
Country of Publication:
United States
Language:
English

Citation Formats

Qi, T. F., Korneta, O. B., Li, L., Butrouna, K., Cao, V. S., Wan, Xiangang, Schlottmann, P., Kaul, R. K., and Cao, G. Spin-orbit tuned metal-insulator transitions in single-crystal Sr₂Ir1–xRhxO₄ (0≤x≤1). United States: N. p., 2012. Web. doi:10.1103/PhysRevB.86.125105.
Qi, T. F., Korneta, O. B., Li, L., Butrouna, K., Cao, V. S., Wan, Xiangang, Schlottmann, P., Kaul, R. K., & Cao, G. Spin-orbit tuned metal-insulator transitions in single-crystal Sr₂Ir1–xRhxO₄ (0≤x≤1). United States. doi:10.1103/PhysRevB.86.125105.
Qi, T. F., Korneta, O. B., Li, L., Butrouna, K., Cao, V. S., Wan, Xiangang, Schlottmann, P., Kaul, R. K., and Cao, G. Thu . "Spin-orbit tuned metal-insulator transitions in single-crystal Sr₂Ir1–xRhxO₄ (0≤x≤1)". United States. doi:10.1103/PhysRevB.86.125105.
@article{osti_1103269,
title = {Spin-orbit tuned metal-insulator transitions in single-crystal Sr₂Ir1–xRhxO₄ (0≤x≤1)},
author = {Qi, T. F. and Korneta, O. B. and Li, L. and Butrouna, K. and Cao, V. S. and Wan, Xiangang and Schlottmann, P. and Kaul, R. K. and Cao, G.},
abstractNote = {Sr₂IrO₄ is a magnetic insulator driven by spin-orbit interaction (SOI) whereas the isoelectronic and isostructural Sr₂RhO₄ is a paramagnetic metal. The contrasting ground states have been shown to result from the critical role of the strong SOI in the iridate. Our investigation of structural, transport, magnetic, and thermal properties reveals that substituting 4d Rh⁴⁺ (4d⁵) ions for 5d Ir⁴⁺ (5d⁵) ions in Sr₂IrO₄ directly reduces the SOI and rebalances the competing energies so profoundly that it generates a rich phase diagram for Sr₂Ir1–xRhxO₄ featuring two major effects: (1) Light Rh doping (0 ≤ x ≤ 0.16) prompts a simultaneous and precipitous drop in both the electrical resistivity and the magnetic ordering temperature TC, which is suppressed to zero at x = 0.16 from 240 K at x = 0. (2) However, with heavier Rh doping [0.24 < x < 0.85 (±0.05)] disorder scattering leads to localized states and a return to an insulating state with spin frustration and exotic magnetic behavior that only disappears near x = 1. The intricacy of Sr₂Ir1–xRhxO₄ is further highlighted by comparison with Sr₂Ir1–xRuxO₄ where Ru⁴⁺ (4d⁴) drives a direct crossover from the insulating to metallic states.},
doi = {10.1103/PhysRevB.86.125105},
journal = {Physical Review. B, Condensed Matter and Materials Physics},
number = 12,
volume = 86,
place = {United States},
year = {2012},
month = {9}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1103/PhysRevB.86.125105

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Cited by: 47 works
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