Predicted formation of superconducting platinum-hydride crystals under pressure in the presence of molecular hydrogen

Abstract

Noble metals adopt close-packed structures at ambient pressure and rarely undergo structural transformation at high pressures. Platinum (Pt), in particular, is normally considered to be unreactive and is therefore not expected to form hydrides under pressure. We predict that platinum hydride (PtH) has a lower enthalpy than its constituents solid Pt and molecular hydrogen at pressures above 21.5 GPa. We have calculated structural phase transitions from tetragonal to hexagonal close-packed or face-centered cubic (fcc) PtH between 70 and 80 GPa. Linear response calculations indicate that PtH is a superconductor at these pressures with a critical temperature of about 10--25 K. These findings help to shed light on recent observations of pressure-induced metallization and superconductivity in hydrogen-rich materials. We show that formation of fcc metal hydrides under pressure is common among noble metal hydrides and examine the possibility of superconductivity in these materials.

accepted in Phys. Rev. Lett.; 11 pages, 4 figures; includes supplementary information (9 pages, 4 figures)

References in corpus (2)

• High-pressure phases of silane
• Formation of transition metal hydrides at high pressures

Cited by in corpus (25)

• A Perspective on Conventional High-Temperature Superconductors at High Pressure: Methods and Materials
• Hydrogen sulphide at high pressure: a strongly-anharmonic phonon-mediated superconductor
• Anharmonic free energies and phonon dispersions from the stochastic self-consistent harmonic approximation: application to platinum and palladium hydrides
• First-Principles Theory of Anharmonicity and the Inverse Isotope Effect in Superconducting Palladium-Hydride Compounds
• First-principles study of the pressure and crystal-structure dependences of the superconducting transition temperature in compressed sulfur hydrides
• Tellurium Hydrides at High Pressures: High-temperature Superconductors
• Superconductivity in metastable phases of phosphorus-hydride compounds under high pressure
• Possible Superconductivity Approaching Ice Point
• The crystal structure of cold compressed graphite
• High pressure structures of disilane and their superconducting properties
• Materials informatics based on evolutionary algorithms: Application to search for superconducting hydrogen compounds
• The Search for Superconductivity in High Pressure Hydrides
• Superconductivity of platinum hydride
• Strong Anharmonic and Quantum Effects in Pm-3n AlH3 Under High Pressure: A First-Principles Study
• Universal diamond edge Raman scale to 0.5 terapascal: The implication to metallization of hydrogen
• Lithium Subhydrides Under Pressure and their Superatom-Like Building Blocks
• Quantum anharmonic enhancement of superconductivity in $P{6}_3/mmc$ ScH${}_6$ at high pressures: a first-principles study
• Spin excitations in the nematic phase and the metallic stripe spin-density wave phase of iron pnictides
• Study of the superconducting state in the Cmmm phase of GeH4 compound
• High-Pressure Hydrogen Sulfide by Diffusion Quantum Monte Carlo
• Description of the superconducting state in the high-pressure fcc phase of platinum-hydride
• First-principles estimation of the superconducting transition temperature of a metallic hydrogen liquid
• Characterization of the superconducting phase in tellurium hydride at high pressure
• Hydrogen (deuterium) dynamics and thermal stability in ion-irradiated platinum-hydride thin films synthesized at low temperature
• Strong-coupling character of superconducting phase in compressed selenium hydride