Interplanar Ferromagnetism Enhanced Ultrawide Zero Thermal Expansion in Kagome Cubic Intermetallic (Zr,Nb)Fe2

• DOI: 10.1021/jacs.3c03160
• Publication Date: 2023-07-25T19:54:44Z
• Authors: Yanming Sun; Yili Cao; Shixin Hu; Maxim Avdeev; Chin-Wei Wang; Sergii Khmelevskyi; Yang Ren; Saul H. Lapidus; Xin Chen; Qiang Li; Jinxia Deng; Jun Miao; Kun Lin; Xiaojun Kuang; Xianran Xing
• Keywords: Negative Thermal Expansion

A cubic metal exhibiting zero thermal expansion (ZTE) over a wide temperature window demonstrates significant applications in broad range of advanced technologies but is extremely rare nature. Here, enabled by high-temperature synthesis, we realize tunable via magnetic doping the class kagome (Fd-3m) intermetallic (Zr,Nb)Fe2. remarkably isotropic ZTE achieved with negligible coefficient (+0.47 × 10-6 K-1) from 4 to 425 K, almost wider than most metals available. combined situ magnetization, neutron powder diffraction, and hyperfine Mössbauer spectrum analysis reveals that interplanar ferromagnetic ordering contributes large compensation for normal lattice contraction upon cooling. Trace Fe-doping introduces extra exchange interactions distinctly enhance ferromagnetism temperature, thus engendering such an ultrawide ZTE. This work presents promising metallic materials.