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| Motta, Antonella |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Petrov, R. H. | Madrid |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Ali, M. A. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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Taylor, Nicole K.
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article
Limits to the strain engineering of layered square-planar nickelate thin films
Abstract
<jats:title>Abstract</jats:title><jats:p>The layered square-planar nickelates, Nd<jats:sub><jats:italic>n</jats:italic>+1</jats:sub>Ni<jats:sub><jats:italic>n</jats:italic></jats:sub>O<jats:sub>2<jats:italic>n</jats:italic>+2</jats:sub>, are an appealing system to tune the electronic properties of square-planar nickelates via dimensionality; indeed, superconductivity was recently observed in Nd<jats:sub>6</jats:sub>Ni<jats:sub>5</jats:sub>O<jats:sub>12</jats:sub> thin films. Here, we investigate the role of epitaxial strain in the competing requirements for the synthesis of the <jats:italic>n</jats:italic> = 3 Ruddlesden-Popper compound, Nd<jats:sub>4</jats:sub>Ni<jats:sub>3</jats:sub>O<jats:sub>10</jats:sub>, and subsequent reduction to the square-planar phase, Nd<jats:sub>4</jats:sub>Ni<jats:sub>3</jats:sub>O<jats:sub>8</jats:sub>. We synthesize our highest quality Nd<jats:sub>4</jats:sub>Ni<jats:sub>3</jats:sub>O<jats:sub>10</jats:sub> films under compressive strain on LaAlO<jats:sub>3</jats:sub> (001), while Nd<jats:sub>4</jats:sub>Ni<jats:sub>3</jats:sub>O<jats:sub>10</jats:sub> on NdGaO<jats:sub>3</jats:sub> (110) exhibits tensile strain-induced rock salt faults but retains bulk-like transport properties. A high density of extended defects forms in Nd<jats:sub>4</jats:sub>Ni<jats:sub>3</jats:sub>O<jats:sub>10</jats:sub> on SrTiO<jats:sub>3</jats:sub> (001). Films reduced on LaAlO<jats:sub>3</jats:sub> become insulating and form compressive strain-induced <jats:italic>c</jats:italic>-axis canting defects, while Nd<jats:sub>4</jats:sub>Ni<jats:sub>3</jats:sub>O<jats:sub>8</jats:sub> films on NdGaO<jats:sub>3</jats:sub> are metallic. This work provides a pathway to the synthesis of Nd<jats:sub><jats:italic>n</jats:italic>+1</jats:sub>Ni<jats:sub><jats:italic>n</jats:italic></jats:sub>O<jats:sub>2<jats:italic>n</jats:italic>+2</jats:sub> thin films and sets limits on the ability to strain engineer these compounds via epitaxy.</jats:p>