Large effects of epitaxial tensile strain on electrical transport of Mn-doped NdNiO3 thin films

Orientations-Dependent Metal-to-Insulator Transition in Solution-Deposited High-Entropy Nickelate Thin Films

“…Furthermore, these residual strains can be survived with the quench cooling done in this work after annealing. Additionally, it has been reported that octahedral deformation may be induced by the symmetry mismatch between dissimilar octahedral tilt systems. , It will lead to distorted NiO 6 octahedra, resulting in different lattice constants as well as demonstrating different residual strains within the differently oriented epitaxial rare-earth nickelate thin films. , For our samples, the film thickness is as thin as 7 nm. The rigid epitaxy, as shown in Figure e–g, will force the NiO 6 octahedra to remain with the substrate.…”

“…Additionally, it has been reported that octahedral deformation may be induced by the symmetry mismatch between dissimilar octahedral tilt systems. 19,20 It will lead to distorted NiO 6 octahedra, resulting in different lattice constants as well as demonstrating different residual strains within the differently oriented epitaxial rare-earth nickelate thin films. 14,22 For our samples, the film thickness is as thin as 7 nm.…”

“…On the other hand, strongly correlated materials usually hold valuable physical and chemical functional properties, including metal-to-insulator transition, high-temperature superconductivity, photoelectricity, and catalytic activity. − Rare-earth nickelates (RNiO 3 , R denotes rare earth), which are canonical materials with strong correlations, have received extensive research interest due to their sharp metal-to-insulator transition (MIT), as well as new superconductivity. , Variations in the size of the rare-earth cation R can modulate the MIT temperature . The film’s strain can control the resistivity changes across the MIT. , In addition, the local chemical disorder induced by more cations may lead to or even dominate the emergence of functionality. , Thus, the synthesis and investigation of rare-earth nickelate HEO is not only helpful toward understanding the MIT nature of RNiO 3 from a fundamental standpoint, but also can be expected to have a significant impact in the field of strongly correlated materials.…”

“…9,18 In addition, the local chemical disorder induced by more cations may lead to or even dominate the emergence of functionality. 19,20 Thus, the synthesis and investigation of rare-earth nickelate HEO is not only helpful toward understanding the MIT nature of RNiO 3 from a fundamental standpoint, but also can be expected to have a significant impact in the field of strongly correlated materials.…”

Switching of majority charge carriers by Zn doping in NdNiO3 thin films

“…Also, the transition metals like Cu, Fe, Co, are used as the dopant in bulk LaNiO 3 and NdNiO 3 [33][34][35]. However, in thin films, there are only a few studies performed on Nisite doping [19,20,23,36]. In our earlier investigations, the doping of electrons via larger size tetravalent Mn at Ni site under strain (compressive and tensile) was found responsible for shifting the T MI at higher temperatures and bring a complete insulating state [19,23].…”