高压大幅提升混合轨道磁性材料居里温度

（Outstanding TC Enhancement in 5d–3d Y2NiIrO6 by Compression）

Z. Deng, Y. Zhang, S. J. Zhang, J. Song, W. L. He, Y. Z. Li, M. L. Jin, X. Li, G. H. Liu, Z. Dong, J. K. Bi, W. M. Li, J. F. Zhao, J. Zhang, Y. Peng, L. C. Shi, J. L. Meng, X. C. Wang, and C. Q. Jin

Advanced Science 13, e75739 (2026)

Understanding and predicting the properties of 5 d compounds critically depend on the identification of the superexchange interactions from which their magnetism emerges. The study of pressure effects on double perovskite YNiIrO(YNIO) provides deep insight toward this goal. At ambient pressure, YNIO is a ferrimagnetic insulator with the Ir-5 d J= 1/2 Mott-insulating state. Under physical pressure up to 17 GPa, the compound exhibits concurrent compression on Ni/Ir ─O bond lengths and Ni ─O ─Ir bond angles, leading to an increase of the Curie temperature from 192 to 243 K. On the contrary, external pressure increases distanced Ir ─Ir interaction and in turn induces magnetic frustration in SrIrO/SrIrOdue to the extended 5 d orbitals. In YNIO, the rock-salt ordered Ni ─Ir naturally blocks extended superexchange beyond the nearest neighbor, and in turn suppresses such magnetic frustration. Moreover, the orthogonal Ni e–Ir tpathway in YNIO is robust under lattice distortion, while the superexchange is weakened by bond bending in LaNiMnOwith a similar half-filed e–tconfiguration. Our findings establish a framework for elucidating the mechanism of 5 d –3 d superexchange and guide bond-engineered magnetism in iridate-related systems.