Journal
RARE METALS
Volume 40, Issue 10, Pages 2847-2854Publisher
NONFERROUS METALS SOC CHINA
DOI: 10.1007/s12598-021-01768-3
Keywords
Nickelates; Superconductivity; Ni-based superconductivity; High-field transport; Electric-field modulation
Funding
- National Natural Science Foundation of China [51822101, 51861135104, 51771009]
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The study presents experimental results on a 14-nm-thick superconducting Nd0.8Sr0.2NiO2/SrTiO3 thin-film heterostructure, revealing key performance characteristics such as a relatively small critical current density and complex magnetotransport properties.
The emerging Ni-based superconducting oxide thin films are rather intriguing to the entire condensed matter physics. Here, we report some brief experimental results on transport measurements for a 14-nm-thick superconducting Nd0.8Sr0.2NiO2/SrTiO3 thin-film heterostructure with an onset transition temperature of similar to 9.5 K. Photoluminescence measurements reveal that there is negligible oxygen vacancy creation in the SrTiO3 substrate during thin-film deposition and post chemical reduction for the Nd0.8Sr0.2NiO2/SrTiO3 heterostructure. It was found that the critical current density of the Nd0.8Sr0.2NiO2/SrTiO3 thin-film heterostructure is relatively small, similar to 4 x 10(3) A.cm(-2). Although the surface steps of SrTiO3 substrates lead to an anisotropy for in-plane resistivity, the superconducting transition temperatures are almost the same. The out-of-plane magnetotransport measurements yield an upper critical field of similar to 11.4 T and an estimated in-plane Ginzburg-Landau coherence length of similar to 5.4 nm. High-field magnetotransport measurements up to 50 T reveal anisotropic critical fields at 1.8 K for three different measurement geometries and a complicated Hall effect. An electric field applied via the SrTiO3 substrate slightly varies the superconducting transition temperature. These experimental results could be useful for this rapidly developing field.
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