Nature - USA (2020-10-15)

Article

Extended Data Fig. 3 | Superconducting properties of the C–S–H system.
a, Coherence length versus temperature. b, Temperature dependence of the
penetration depth. The penetration depth can be determined to be
λ(0) > 3.8 nm as λ(0)=φH 0 /[ 22 π(c0)ξ(0)] with Hc(0) = 61.8 T and ξ(0) = 2.3 nm;
φ 0 is the magnetic f lux quantum. c, GL parameter, κ = λ(T)/ξ(T) at T=0; κ>1/2

indicates type II superconductivity. In our experiment κ > 1.1, so the sample can

be identified as a type II superconductor. d, Variation of the superconducting

bandgap Δ versus temperature, ΔT()/(Δk0)=1.7 (^61) BcTT−(/Tc) (kB, Boltzmann
constant).