期刊
PHYSICAL REVIEW MATERIALS
卷 4, 期 12, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevMaterials.4.124407
关键词
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资金
- DOE Office of Science [DE-AC02-06CH11357]
- National Science Foundation [DMR-1332208, DMR-1829070]
- National Science Foundation, Division of Materials Research [DMR-1455264, DMR-2003117]
Heavy transition metal magnets with J(eff) = 1/2 electronic ground states have attracted recent interest due to their penchant for hosting new classes of quantum spin liquids and superconductors. Unfortunately, model systems with ideal J(eff) = 1/2 states are scarce due to the importance of noncubic local distortions in most candidate materials. In this work, we identify a family of iridium halide systems [i.e., K2IrCl6, K2IrBr6, (NH4)(2)IrCl6, and Na2IrCl6.6(H2O)] with Ir-4(+) electronic ground states exhibiting extremely small deviations from the ideal J(eff) =1 limit. We also find ordered magnetic ground states for the three anhydrous systems, with single-crystal neutron diffraction on K2IrBr6 revealing type-I antiferromagnetism. This spin configuration is consistent with expectations for significant Kitaev exchange in a face-centered-cubic magnet. This work establishes that incorporating isolated IrX6 octahedra in materials, where X is a halogen ion with a low electronegativity, is an effective design principle for realizing unprecedented proximity to the pure J(eff) = state. At the same time, we highlight undeniable deviations from this ideal state, even in clean materials with ideal IrX6 octahedra as inferred from the global cubic crystal structures.
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