Coexisting charge and magnetic orders in the dimer-chain iridate Ba5AlIr2O11

Terzic, J.; Wang, J. C.; Ye, Feng; Song, W. H.; Yuan, S. J.; Aswartham, S.; DeLong, L. E.; Streltsov, S. V.; Khomskii, Daniel I.; Cao, G.

doi:10.1103/PhysRevB.91.235147

Title: Coexisting charge and magnetic orders in the dimer-chain iridate Ba₅AlIr₂O₁₁

Journal Article · Mon Jun 29 00:00:00 EDT 2015 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PhysRevB.91.235147· OSTI ID:1324136

Terzic, J. ^[1]; Wang, J. C. ^[2]; Ye, Feng ^[3]; Song, W. H. ^[4]; Yuan, S. J. ^[1]; Aswartham, S. ^[1]; DeLong, L. E. ^[1]; Streltsov, S. V. ^[5]; Khomskii, Daniel I. ^[6]; Cao, G. ^[1]

Univ. of Kentucky, Lexington, KY (United States). Center for Advanced Materials. Dept. of Physics and Astronomy
Univ. of Kentucky, Lexington, KY (United States). Center for Advanced Materials. Dept. of Physics and Astronomy; Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Quantum Condensed Matter Division; Renmin Univ. of China, Beijing (China). Dept. of Physics
Univ. of Kentucky, Lexington, KY (United States). Center for Advanced Materials. Dept. of Physics and Astronomy; Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Quantum Condensed Matter Division
Univ. of Kentucky, Lexington, KY (United States). Center for Advanced Materials. Dept. of Physics and Astronomy; Chinese Academy of Sciences (CAS), Hefei (China). Inst. of Solid State Physics
Inst. of Metal Physics, Ekaterinburg (Russian Federation); Ural Federal Univ., Ekaterinburg (Russian Federation). Dept. of Physics
Univ. of Cologne (Germany). Inst. of Physics II

In this paper, we have synthesized and studied single-crystal Ba₅AlIr₂O₁₁ that features dimer chains of two inequivalent octahedra occupied by tetravalent Ir⁴⁺(5d⁵) and pentavalent Ir⁵⁺(5d⁴) ions, respectively. Ba₅AlIr₂O₁₁ is a Mott insulator that undergoes a subtle structural phase transition near T_S=210K and a magnetic transition at T_M=4.5K; the latter transition is surprisingly resistant to applied magnetic fields μ_oH≤12T but more sensitive to modest applied pressure (dT_M/dp ≈ +0.61K/GPa). All results indicate that the phase transition at T_S signals an enhanced charge order that induces electrical dipoles and strong dielectric response near T_S. It is clear that the strong covalency and spin-orbit interaction (SOI) suppress double exchange in Ir dimers and stabilize a novel magnetic state that is neither S=3/2 nor J=1/2, but rather lies in an “intermediate” regime between these two states. Finally, the novel behavior of Ba₅AlIr₂O₁₁ therefore provides unique insights into the physics of SOI along with strong covalency in competition with double-exchange interactions of comparable strength.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF); Civil Research and Development Foundation (CRDF) (United States); Russian Foundation of Basic Research; China Scholarship Council

Grant/Contract Number:: AC05-00OR22725; DMR-1265162; 13-02-00374; FSCX-14-61025-0

OSTI ID:: 1324136

Alternate ID(s):: OSTI ID: 1198602

Journal Information:: Physical Review. B, Condensed Matter and Materials Physics, Vol. 91, Issue 23; ISSN 1098-0121

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 27 works

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Ground state in the novel dimer iridate $B a_{13} I r_{6} O_{30}$ with $I r^{6 +} (5 d^{3})$ ions Zhao, Hengdi; Ye, Feng; Zheng, Hao Physical Review B, Vol. 100, Issue 6 https://doi.org/10.1103/physrevb.100.064418	journal	August 2019
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Non-Kitaev spin liquids in Kitaev materials Li, Yao-Dong; Yang, Xu; Zhou, Yi Physical Review B, Vol. 99, Issue 20 https://doi.org/10.1103/physrevb.99.205119	journal	May 2019
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