Hydrogen crystals reduce dissipation in superconducting resonators
Francesco Valenti, Andrew N. Kanagin, Andreas Angerer, Luiza Buimaga-Iarinca, Cristian Morari, Jörg Schmiedmayer, Ioan M. Pop
DOI 10.1103/PhysRevB.109.054503 · Physical Review B
Active bibliographic source — not scientific approval
Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.
Abstract
We show that the internal quality factors of high-impedance superconducting resonators made of granular aluminum can be improved by coating them with micrometric films of solid parahydrogen molecular crystals. We attribute the average measured ≈8% reduction in dissipation to the absorption of stray terahertz radiation at the crystal-resonator interface and the subsequent dissipation of its energy in the form of phonons below the pair-breaking gap. Our results prove that contrary to expectations, replacing the vacuum dielectric atop a superconducting resonator can be beneficial, thanks to the added protection against Cooper pair-braking terahertz radiation. Moreover, at the level of internal quality factors in the 105 range, the hydrogen crystal does not introduce additional losses, which is promising for embedding impurities to couple to superconducting thin-film devices in hybrid quantum architectures.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Al Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
Similar papers
Effect of hydrogen molecules on the electronic transport through atomic-sized metallic junctions in the superconducting state
similarity 0.95P. Makk et al.
Source status unknown — claims are unverified
Effects of Dissipation on a Superconducting Single Electron Transistor
similarity 0.94J. B. Kycia et al.
Source status unknown — claims are unverified
Enhancement and decrease of critical current due to suppression of superconductivity by a magnetic field
similarity 0.94D. Y. Vodolazov et al.
Source status unknown — claims are unverified
Masking effect of heat dissipation on the current-voltage characteristics of a mesoscopic superconducting sample with leads
similarity 0.94D. Y. Vodolazov et al.
Source status unknown — claims are unverified
Nonlocal effects in mesoscopic superconducting aluminum structures
similarity 0.94C. Strunk et al.
Source status unknown — claims are unverified
Evaluating the contribution of slow recombination in localized subgap states to the excess quasiparticle population in ordered superconductors
similarity 0.93Eva Gurra et al.
Source status unknown — claims are unverified