Evidence for a low-temperature magnetic ground state in double-perovskite iridates with Ir5+(5d4) ions

Terzic, Jasminka; Zheng, Hao; Ye, Feng; Zhao, H. D.; Schlottmann, P.; De Long, L. E.; Yuan, S. J.; Cao, Gang

doi:10.1103/PhysRevB.96.064436

Evidence for a low-temperature magnetic ground state in double-perovskite iridates with $I r^{5 +} (5 d^{4})$ ions

Journal Article · Tue Aug 29 00:00:00 EDT 2017 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.96.064436· OSTI ID:1471893

Terzic, Jasminka ^[1]; Zheng, Hao ^[1]; ^[2]; Zhao, H. D. ^[1]; Schlottmann, P. ^[3]; De Long, L. E. ^[4]; Yuan, S. J. ^[4]; Cao, Gang ^[1]

Univ. of Colorado, Boulder, CO (United States). Dept. of Physics
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Quantum Condensed Matter Division; Univ. of Kentucky, Lexington, KY (United States). Dept. of Physics and Astronomy and Center for Advanced Materials
Florida State Univ., Tallahassee, FL (United States). Dept. of Physics
Univ. of Kentucky, Lexington, KY (United States). Dept. of Physics and Astronomy and Center for Advanced Materials

Here, we report an unusual magnetic ground state in single-crystal, double-perovskite Ba₂YIrO₆ and Sr-doped Ba₂YIrO₆ with Ir⁵⁺ (5d⁴) ions. Long-range magnetic order below 1.7 K is confirmed by dc magnetization, ac magnetic susceptibility, and heat-capacity measurements. The observed magnetic order is extraordinarily delicate and cannot be explained in terms of either a low-spin S=1 state, or a singlet J_eff=0 state imposed by the spin-orbit interactions (SOI). Alternatively, the magnetic ground state appears consistent with a SOI that competes with comparable Hund's rule coupling and inherently large electron hopping, which cannot stabilize the singlet J_eff=0 ground state. However, this picture is controversial, and conflicting magnetic behavior for these materials is reported in both experimental and theoretical studies, which highlights the intricate interplay of interactions that determine the ground state of materials with strong SOI.

View Accepted Manuscript (DOE)

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

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); National Science Foundation (NSF)

Grant/Contract Number:: AC05-00OR22725; FG02-98ER45707

OSTI ID:: 1471893

Alternate ID(s):: OSTI ID: 1377642

Journal Information:: Physical Review B, Journal Name: Physical Review B Journal Issue: 6 Vol. 96; ISSN 2469-9950; ISSN PRBMDO

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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