Optical properties of superconducting pressurized LaH
arXiv:2007.06640 · doi:10.1103/PhysRevB.102.024501
Abstract
Recently superconductivity has been discovered at around 200~K in a hydrogen sulfide system and around 260~K in a lanthanum hydride system, both under pressures of about 200 GPa. These record-breaking transition temperatures bring within reach the long-term goal of obtaining room temperature superconductivity. We have used first-principle calculations based on density functional theory (DFT) along with Migdal-Eliashberg theory to investigate the electron-phonon mechanism for superconductivity in the phase proposed for the LaH superconductor. We show that the very high transition temperature results from a highly optimized electron-phonon interaction that favors coupling to high frequency hydrogen phonons. Various superconducting properties are calculated, such as the energy gap, the isotope effect, the specific heat jump at , the thermodynamic critical field and the temperature-dependent penetration depth. However, our main emphasis is on the finite frequency optical properties, measurement of which may allow for an independent determination of and also a confirmation of the mechanism for superconductivity.
arXiv comment9 pages, 9 figures
References in corpus (31)
- Separable Dual Space Gaussian Pseudo-potentials
- Relativistic separable dual-space Gaussian Pseudopotentials from H to Rn
- Conventional superconductivity at 203 K at high pressures
- Superconductivity at 250 K in lanthanum hydride under high pressures
- Evidence for superconductivity above 260 K in lanthanum superhydride at megabar pressures
- Superconductive "sodalite"-like clathrate calcium hydride at high pressures
- The metallization and superconductivity of dense hydrogen sulfide
- Observation of the Wigner-Huntington Transition to Solid Metallic Hydrogen
- Electron-phonon interactions and related physical properties of metals from linear-response theory
- Crystal Structure of 200 K-Superconducting Phase of Sulfur Hydride System
- A Perspective on Conventional High-Temperature Superconductors at High Pressure: Methods and Materials
- Hydrogen sulphide at high pressure: a strongly-anharmonic phonon-mediated superconductor
- Quantum Crystal Structure in the 250 K Superconducting Lanthanum Hydride
- Pressure-induced decomposition of solid hydrogen sulfide
- Quantum Hydrogen-Bond Symmetrization and High-Temperature Superconductivity in Hydrogen Sulfide
- Superconducting hydrides under pressure
- What superconducts in sulfur hydrides under pressure, and why
- High temperature superconductivity in sulfur and selenium hydrides at high pressure
- Dissociation products and structures of solid H2S at strong compression
- Spectroscopy of HS: evidence of a new energy scale for superconductivity
- Superconductivity of and polyhydrides
- Hydrogen sulfide at high pressure: change in stoichiometry
- Linear-Response Calculation of Electron-Phonon Coupling Parameters
- Comparison of pressurized sulfur hydride with conventional superconductors
- How Compressed Hydrides Produce Room Temperature Superconductivity
- High-pressure phase diagram of hydrogen and deuterium sulfides from first principles: structural and vibrational properties including quantum and anharmonic effects
- Multiband Nature of the Room-Temperature Superconductivity in Compressed LaH
- Isotope effect in superconducting lanthanum hydride under high compression
- Optical self-energy of superconducting Pb in the THz region
- Detecting superconductivity in the high pressure hydrides and metallic hydrogen from optical properties
- Spectroscopic signatures of phonons in high pressure superconducting hydrides