High-temperature superconductivity in La4H23 below 100 GPa
Sam Cross, Jonathan Buhot, Annabelle Brooks, William Thomas, Annette Kleppe, Oliver Lord, Sven Friedemann
DOI 10.1103/PhysRevB.109.L020503 · 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
High-temperature superconductivity has been observed in binary hydrides such as LaH10 at pressures close to 180GPa, whereby hydrogen cagelike structures have been identified as a common motif beneficial for high critical temperatures Tc. Efforts are now focused on finding hydride high-temperature superconductors at lower pressures. We present evidence for high-temperature superconductivity in binary La4H23 at a pressure of P=95GPa, with A15-type arrangement of the lanthanum atoms in the type-I clathrate structure. We synthesize La4H23 from a lanthanum film capped with a palladium catalyst promoting the dissociation of hydrogen. In resistance measurements, we observe superconductivity with a transition temperature Tc∼90K. The A15-type lanthanum sublattice is identified in x-ray diffraction on the same sample, in agreement with previous x-ray diffraction and structure prediction studies. Our study reinforces the favorability of cagelike networks of the hydrogen lattice for high-temperature superconductivity.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| La4H23 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 86 | 95 GPa | onset |
| La4H23 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 95 | 95 GPa | onset |
| LaH10 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 250 | 180 GPa | unknown |
| LiNa3H23 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Lu4H23 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | 200 GPa | unknown |
Similar papers
High-temperature superconductivity in the Ti-H system at high pressures
similarity 0.96Jin Zhang et al.
Source status unknown — claims are unverified
High-temperature superconducting ternary Li−R−H superhydrides at high pressures (R=Sc,Y,La)
similarity 0.96Ying Sun et al.
Source status unknown — claims are unverified
Predictions of high-temperature superconducting ternary hydrides under high pressure using density functional calculations
similarity 0.96Bangshuai Zhu et al.
Source status unknown — claims are unverified
Emergence of near room-temperature superconductivity in hydrides with H2 molecular units
similarity 0.96Zhao Liu et al.
Source status unknown — claims are unverified
Superconductivity of electron-doped chalcohydrides under high pressure
similarity 0.96Yu Du et al.
Source status unknown — claims are unverified
Superconductivity of LaH10 and LaH16 polyhydrides
similarity 0.93Ivan A. Kruglov et al.
Source status unknown — claims are unverified