Researchers used cutting-edge X-ray techniques to gain new insights into 'infinite-layer' nickelate materials.
So-called"infinite-layer" nickelate materials, characterized by their unique crystal and electronic structures, exhibit significant potential as high-temperature superconductors. Studying these materials remains challenging for researchers; they have only been synthesized as thin films and then"capped" with a protective layer that could alter properties of the nickelate layered system.
More recently, nickel-based materials have attracted attention as a new family of high temperature superconductors analogous to cuprates. Neodymium nickelate becomes particularly interesting when strontium is added to its structure. This compound is known as an"infinite layer nickelate," since nickel atoms are arranged in a two-dimensional square lattice that repeats indefinitely in two dimensions, earning the moniker"infinite.
To answer this question, the team employed two beamlines at NSLS-II to investigate high quality nickelate thin film samples with and without a capping layer of strontium titanate to see if the layer has an effect on magnetic and electronic properties. Magnetic properties are critical because they relate to the material's intrinsic electronic structure, which is directly linked to its superconductivity.
"The similarity between copper oxide planes in superconducting cuprates and nickel oxide planes in nickelates have had scientists searching for superconductivity in nickelates for 25 years," said Claudio Mazzoli, lead beamline scientist at CSX."Now that it has finally been found, we need to understand the differences and commonalities in these two cases and the physics behind them to gain control of this fascinating phenomenon for technological applications."S. Fan, H.
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