Physical properties revealed by transport measurements on superconducting Nd${}_{0.8}$Sr${}_{0.2}$NiO${}_2$ thin films

Abstract

The newly found superconductivity in infinite-layer nickelate superconducting films has attracted much attention, because their crystalline and electronic structures are similar to high-$T_c$ cuprate superconductors. The upper critical field can provide much information on superconductivity, but detailed experimental data are still lacking in these films. Here we present temperature and angle dependence of resistivity measured under different magnetic fields ($H$) in Nd${}_{0.8}$Sr${}_{0.2}$NiO${}_2$ thin films. The onset superconducting transition occurs at about 16.2 K at 0 T. Temperature dependent upper critical fields determined by using a criterion very close to the onset transition show a clear negative curvature near the critical transition temperature, which is explained as the consequence of the paramagnetically limited effect on superconductivity. The temperature dependent anisotropy of the upper critical field is obtained from resistivity data, which yields a value decreasing from 3 to 1.2 with lowering temperature. This can be explained by a variable contribution from the orbital limit effect on upper critical field. The angle dependent resistivity at a fixed temperature and different magnetic fields cannot be scaled to one curve, which deviates from the prediction of the anisotropic Ginzburg-Landau theory. However, at low temperatures, the increased resistivity by magnetic field can be scaled by the parameter $H^{\beta }|\cos \theta |$ ($1<\beta <6$) with $\theta$ the angle enclosed between $c$-axis and the applied magnetic field. As the first detailed study on the upper critical field of the nickelate thin films, our results clearly indicate a small anisotropy and paramagnetically limited effect of superconductivity in nickelate superconductors.

arXiv comment22 pages, 5 figures

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• Superconductivity in infinite-layer nickelates
• Superconductivity in nickel based 112 systems
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• Preparation of superconducting thin films of infinite-layer nickelate Nd${}_{0.8}$Sr${}_{0.2}$NiO${}_2$
• Evidence for quasi-two-dimensional superconductivity in infinite-layer nickelates
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• Topotactic Transition: A Promising Opportunity for Creating New Oxides
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• Stability of Superconducting Nd0.8Sr0.2NiO2 Thin Films
• Synthesis of infinite-layer nickelates and influence of the capping-layer on magnetotransport
• Negligible oxygen vacancies, low critical current density, electric-field modulation, in-plane anisotropic and high-field transport of a superconducting Nd0.8Sr0.2NiO2/SrTiO3 heterostructure
• Electronic structure of higher-order Ruddlesden-Popper nickelates
• Epitaxial growth of Ruddlesden-Popper neodymium nickelates Nd${}_{n+1}$Ni${}_n$O${}_{3n+1}$ ($n$ = 1-5)
• Quantifying interaction mechanism in infinite layer nickelate superconductors
• Synthesis and Properties of La${}_{1-x}$Sr${}_x$NiO${}_3$ and La${}_{1-x}$Sr${}_x$NiO${}_2$
• Possible structural quantum criticality tuned by rare-earth ion substitution in infinite-layer nickelates
• Observation of Josephson-like tunneling junction characteristics and positive magnetoresistance in Oxygen deficient Nickelate films of $N{d}_{0.8}S{r}_{0.2}Ni{O}_{3-\delta }$
• Intrinsic coherence length anisotropy in nickelate, and some pnictide, and chalcogenide superconductors