Pressure-Induced Color Change in the Lutetium Dihydride LuH<sub>2</sub>
Pengfei Shan, Ningning Wang, Xiquan Zheng, Qingzheng Qiu, Y. Y. Peng, Jinguang Cheng
Abstract
The lutetium dihydride LuH 2 is stable at ambient conditions. Here we show that its color undergoes sequential changes from dark blue at ambient pressure to pink at ∼ 2.2 GPa and then to bright red at ∼ 4 GPa upon compression in a diamond anvil cell. Such a pressure-induced color change in LuH 2 is reversible and it is very similar to that recently reported in the N-doped lutetium hydride [ Nature 615 , 244 (2023)]. However, our preliminary resistance measurements on LuH 2 under pressures up to ∼ 7 GPa evidenced no superconductivity down to 1.5 K.
Topics & Concepts
LutetiumAmbient pressureMaterials scienceDiamond anvil cellHigh pressureThermodynamicsPhysicsMetallurgyYttriumOxideHigh-pressure geophysics and materialsRare-earth and actinide compoundsAdvanced Chemical Physics Studies