Pressure tuning of optical reflectivity in LuH2

Abstract

Recently, the claim of room-temperature superconductivity in nitrogen-doped lutetium hydride at near-ambient conditions has attracted tremendous attention. Criticism of the work rises shortly, while further explorations are needed to settle the dispute. One of the intriguing observations is the pressured-induced color change, which has been reproduced in the lutetium dihydride LuH2 while its mechanism remains unclear. Through optical reflectivity measurements of LuH2 in the visible to near-infrared region, we observe strong light absorption next to the sharp plasmon resonance, which continuously shifts to higher energies with increasing pressure. It gives rise to the increased reflection of red light and suppressed reflection of blue light. Our work sheds light on resolving the puzzles regarding the pressure induced color change in LuH2.

8 pages, 6 figures

References in corpus (5)

• Superconductivity to 262 kelvin via catalyzed hydrogenation of yttrium at high pressures
• Absence of near-ambient superconductivity in LuH${}_{2\pm \text{x}}$N${}_y$
• Pressure-induced color change in the lutetium dihydride LuH2
• Lu-H-N phase diagram from first-principles calculations
• Pressure induced color change and evolution of metallic behavior in nitrogen-doped lutetium hydride

Cited by in corpus (14)

• Absence of near-ambient superconductivity in LuH${}_{2\pm \text{x}}$N${}_y$
• Search for ambient superconductivity in the Lu-N-H system
• Structure, Stability and Superconductivity of N-doped Lutetium Hydrides at kbar Pressures
• The near room-temperature upsurge of electrical resistivity in Lu-H-N is not superconductivity, but a metal-to-poor-conductor transition
• Observation of non-superconducting phase changes in LuH${}_{2\pm \text{x}}$N${}_y$
• Temperature and quantum anharmonic lattice effects on stability and superconductivity in lutetium trihydride
• Leading components and pressure-induced color changes in N-doped lutetium hydride
• Microscopic theory of colour in lutetium hydride
• Electronic and magnetic properties of Lu and LuH${}_2$
• Transformation of hexagonal Lu to cubic LuH${}_{2+x}$ single-crystalline films
• Percolation-induced resistivity drop in cold-pressed LuH2
• Anatomy of the band structure of the newest apparent near-ambient superconductor LuH${}_{3-x}$N${}_x$
• Unveiling a Novel Metal-to-Metal Transition in LuH2: Critically Challenging Superconductivity Claims in Lutetium Hydrides
• Pressure-induced color change arising from transformation between intra- and inter-band transitions in LuH${}_{2\pm x}$N${}_y$