Classifying superconductivity in an infinite-layer nickelate Nd0.8Sr0.2NiO2

• Main Author: E.F. Talantsev
• Format: Article
• Language: English
• Published: Elsevier 2020-06-01
• Series: Results in Physics
• Subjects: Superconductivity; Infinite-layer nickelate; Upper critical field; Self-field critical current density; Superconducting energy gap; London penetration depth
• Online Access: http://www.sciencedirect.com/science/article/pii/S2211379720306057

Recently Li et al. (2019 Nature 572 624) discovered a new type of oxide superconductor Nd0.8Sr0.2NiO2 with Tc = 14 K. To classify superconductivity in this infinite-layer nickelate experimental upper critical field, Bc2(T), and the self-field critical current densities, Jc(sf,T), reported by Li et al. (2019 Nature 572 624), are analysed in assumption of s-, d-, and p-wave pairing symmetries and single- and multiple-band superconductivity. Based on deduced the ground-state superconducting energy gap, Δ(0), the London penetration depth, λ(0), the relative jump in electronic specific heat at Tc, ΔC/C, and the ratio of 2Δ(0)/kBTc, we conclude that Nd0.8Sr0.2NiO2 is type-II high-κ weak-coupled single-band s-wave superconductor.