Transmission of radio-frequency waves and nuclear magnetic resonance in lanthanum superhydrides
arXiv:2412.11727 · doi:10.1002/advs.202520701
Abstract
The discovery of near-room temperature superconductivity in the lanthanum hydride LaH has revolutionized this field of research. However, the need to use diamond anvils for the synthesis of such superconductors severely limits the number of experimental techniques to study these materials. Nuclear magnetic resonance (NMR) is one of the key methods for probing spin systems of superconductors. In this work, we show how H NMR measurements can be realized in diamond anvil cells to study high-temperature superconductivity in lanthanum polyhydrides at pressures up to 165 GPa. In the newly discovered superhydride LaH, we observed a pronounced suppression of the H NMR signal intensity below $\textit{T$_{c}$(onset)}$ = 260 K in a magnetic field of 7 T, corresponding to the screening of the radio-frequency pulses. Below the critical temperature of superconductivity, all H NMR characteristics, including the spin-lattice relaxation rate $\textit{1/T$_{1}$T}$, demonstrate pronounced features, evidencing the bulk nature of the superconducting transition. In zero field, the radio-frequency signal transmission through the LaH sample shows a pronounced drop below $\textit{T$_{c}$(onset)}$ = 267 K, confirming the superconducting nature of the transition. A description of the $\textit{1/T$_{1}$T}$ data with an exponential form allows the estimation of the superconducting gap $\textit{$Δ$(0)}$ lying between 427 and 671 K (corresponding to 36.8 to 57.8 meV), and the ratio $\textit{R$_ΔΔ_B_c$}$ between 3.76 and 5.16 in the synthesized hydride sample.
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References in corpus (31)
- Quantum ESPRESSO: a modular and open-source software project for quantum simulations of materials
- Phonons and related properties of extended systems from density-functional perturbation theory
- Crystal Structure Prediction via Particle Swarm Optimization
- Conventional superconductivity at 203 K at high pressures
- Evidence for superconductivity above 260 K in lanthanum superhydride at megabar pressures
- Ab initio Random Structure Searching
- Anomalous high-temperature superconductivity in YH
- Anharmonic free energies and phonon dispersions from the stochastic self-consistent harmonic approximation: application to platinum and palladium hydrides
- Ab-initio theory of superconductivity - I: Density functional formalism and approximate functionals
- Superconductivity at 161 K in Thorium Hydride : Synthesis and Properties
- Ab-initio theory of superconductivity - II: Applications to elemental metals
- Superconductivity at 253 K in lanthanum-yttrium ternary hydrides
- High-Temperature Superconductivity in Cerium Superhydrides
- Superconducting Praseodymium Superhydrides
- Superconductivity of and polyhydrides
- Effect of paramagnetic impurities on superconductivity in polyhydrides: -wave order parameter in Nd-doped LaH
- High-temperature superconductivity in hydrides
- Hot Hydride Superconductivity above 550 K
- Magnetic Lenz lenses increase the limit-of-detection in nuclear magnetic resonance
- Prediction of Room-Temperature Superconductivity in Quasi-atomic H2-Type Hydrides at High Pressure
- Metallic Hydrogen Sublattice and Proton Mobility in Copper Hydride at High Pressure
- Vortex phase dynamics in yttrium superhydride YH at megabar pressures
- Pressure induced Hydrogen-Hydrogen interaction in metallic FeH revealed by NMR
- In-situ High Pressure Nuclear Magnetic Resonance Crystallography
- Fundamental limits on the electron-phonon coupling and superconducting
- Quasi Two-dimensional Vortex Matter in ThH Superhydride
- Ternary superhydrides under pressure of Anderson's theorem: Near-record superconductivity in (La,Sc)H
- Fate of the Hebel-Slichter peak in superconductors with strong antiferromagnetic fluctuations
- Radio Frequency Electrical Resistance Measurement under Destructive Pulsed Magnetic Fields
- Stability and Superconductivity of Ternary Polyhydrides
- Superconducting memory and trapped magnetic flux in ternary lanthanum polyhydrides