Disorder-induced suppression of superconductivity in infinite-layer nickelates

Abstract

The pairing symmetry of superconducting infinite-layer nickelates is a fundamental yet experimentally challenging question. We employ high-energy electron irradiation to induce disorder in superconducting Nd${}_{0.825}$Sr${}_{0.175}$NiO${}_2$ thin films and examine the impact of pair-breaking defects on superconductivity and elucidate the nature of the superconducting gap. Our measurements reveal a complete suppression of superconductivity with increasing disorder, suggesting an unconventional, sign-changing order parameter.

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Cited by in corpus (2)

• Recent progress in nickelate superconductors
• La substitution studies on the heavy-fermion superconductor CeRh${}_2$As${}_2$