Abstract
We report the phase diagram of infinite layer thin films synthesized via topotactic reduction from the perovskite precursor phase using . Based on the electrical transport properties, we find a doping-dependent superconducting dome extending between and 0.28 with a maximum superconducting transition temperature of 14 K at , bounded by weakly insulating behavior on both sides. In contrast to the narrower dome observed in , a local suppression near was not observed for the system. Normal-state Hall effect measurements indicate mixed carrier contributions of both electrons and holes and show a sign change in the Hall coefficient as functions of temperature and , quite similar to that in . Also similar is the observation of a minimum in the normal-state resistivity associated with the superconducting compositions. These findings indicate an infinite layer nickelate phase diagram that is relatively insensitive to the rare-earth element but suggest that disorder arising from the variations of the ionic radii on the rare-earth site affects the superconducting dome.
- Received 29 October 2020
- Accepted 17 November 2020
DOI:https://doi.org/10.1103/PhysRevMaterials.4.121801
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