Pressure-induced color change in the lutetium dihydride LuH2

Abstract

The lutetium dihydride LuH2 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 LuH2 is reversible and it is very similar to that recently reported in the N-doped lutetium hydride. However, our preliminary resistance measurements on LuH2 under pressures up to 7.7 GPa evidenced no superconductivity down to 1.5 K.

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• First-principles study on the superconductivity of N-doped fcc-LuH3
• Lu-H-N phase diagram from first-principles calculations
• Pressure induced color change and evolution of metallic behavior in nitrogen-doped lutetium hydride
• Pressure tuning of optical reflectivity in LuH2
• Unveiling a Novel Metal-to-Metal Transition in LuH2: Critically Challenging Superconductivity Claims in Lutetium Hydrides