Abstract
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.
Highlights
To classify superconductivity in this new class of oxide superconductors the temperature-dependent upper critical field, Bc2(T), and the self-field critical current density, Jc(sf,T), are analysed within s-, d-, and p-pairing symmetries
For several decades the term of infinite-layer superconductor was referred to a copper-oxide superconducting compounds, Sr1−xMxCuO2 (M=La, Nd, Ca, Sr...) [1,2], until recently, Li et al [3] have extended this class of unconventional superconductors by the discovery of superconductivity at Tc = 14 K in Nd0.8Sr0.2NiO2 nickelate
It is shown that infinitelayer Nd0.8Sr0.2NiO2 nickelate is weak-coupled single band s-wave superconductor
Summary
To classify superconductivity in this new class of oxide superconductors the temperature-dependent upper critical field, Bc2(T), and the self-field critical current density, Jc(sf,T), are analysed within s-, d-, and p-pairing symmetries. To deduce the ground state coherence length, (0), in infinite-layer Nd0.8Sr0.2NiO2 nickelate superconductor, three models are used.
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