Corrigendum: Influence of carbon‐ion irradiation on the superconducting critical properties of MgB₂ thin films (2019 Supercond. Sci. Technol. 32 025006)

We have found that there was an error in the calculation of the atomic density of Mg and B in MgB₂. The number of MgB₂ molecules per cm³ (ρ_MgB2) is around 3.4 × 10²², so the number of Mg and B atoms per cm³ must be equal to ρ_MgB2 and twice that of ρ_MgB2, respectively. However, the number of Mg and B atoms per cm³ presented in page 7 correspond to 1/3 and 2/3 of ρ_MgB2, respectively.

In order to estimate the atomic density, the mass density of bulk value is much more useful than that of strained sample such as a thin film. Since MgB₂ has the mass density of 2.57 g cm⁻³ and the molar mass of 45.93 g mol⁻¹, and Avogadro's number N_A ≈ 6.02 × 10²³ mol⁻¹, the ρ_MgB2 is approximately 3.37 × 10²² molecules cm⁻³. Therefore, the number of Mg and B atoms per cm³ in MgB₂ must be ∼3.37 × 10²² atoms cm⁻³ and 6.74 × 10²² atoms cm⁻³, respectively, and the atomic density of MgB₂ is around 10.11 × 10²² atoms cm⁻³.

We believe that the change in atomic density does not lead to any significant issues for all the results and conclusions drawn in the paper.