Large upper critical fields and dimensionality crossover of superconductivity in the infinite-layer nickelate La0.8Sr0.2NiO2
Wei Wei, Wenjie Sun, Yue Sun, Yongqiang Pan, Gangjian Jin, Feng Yang, Yueying Li, Zengwei Zhu, Yuefeng Nie, Zhixiang Shi
DOI 10.1103/PhysRevB.107.L220503 · Physical Review B
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Abstract
The recently emerging superconductivity in infinite-layer nickelates with the isostructural and isoelectronic characteristics of cuprates provides a new platform to explore the pairing mechanism of high-temperature superconductors. In this work, we studied the upper critical field (Hc2) of a high-quality La0.8Sr0.2NiO2 thin film with superconducting transition temperature, Tconset=18.8 K, using high magnetic field up to 56 T. A very large Hc2, ∼40 T for H∥c and ∼52 T for H⊥c, was confirmed, which suggests that infinite-layer nickelates also have great application potential. The anisotropy of Hc2 monotonically decreases from ∼10(γ=Hc2ab/Hc2c) near Tc to ∼1.5 at 2 K. Angle dependence of Hc2 confirms the crossover of superconductivity from two-dimensional to three-dimensional as the temperature decreases. We discussed that the interstitial orbital effect causes the weakening of anisotropy. The observed abnormal upturning of Hc2 at low temperatures is found to be a universal behavior independent of film quality and rare-earth elements. Therefore, it should not be the Fulde-Ferrell-Larkin-Ovchinnikov state due to the fact that it is in the dirty limit and insensitive to disorder.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| La0.8Sr0.2NiO2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 18.8 | Pressure not reported | onset |
| La0.8Sr0.2NiO2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 17.7 | Pressure not reported | midpoint |
| Nd0.775Sr0.225NiO2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 8.5 | Pressure not reported | unknown |
| La0.8Sr0.2NiO2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 6.15 | Pressure not reported | unknown |
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