Effect of Stoichiometry and Strain on the Stabilization of Infinite-Layer Nickelates
ORAL
Abstract
Following the discovery of superconductivity in infinite-layer nickelates,1 the degree to which these nickelates can be considered an analog material for the unconventional cuprate superconductors remains an important question. While notable experimental distinctions – for example, in the ground state of the non-superconducting regions of the superconducting phase diagram – have been made, whether these distinctions are intrinsically tied to the multi-band nature of the nickelates or extrinsically driven by crystallinity limitations has remained unclear.2-4 In this context, significant improvement in the materials control of these thermodynamically unstable infinite-layer nickelates is of utmost importance. Following the recent breakthrough in the crystallinity of Nd1–xSrxNiO2 (x = 0.05-0.325) thin films,5 we discuss the detailed optimization of the two-step stabilization of this material. In particular, we reveal how two key factors – cation stoichiometry and epitaxial strain – significantly influence the crystallinity and the resultant transport properties of these infinite-layer nickelates. Systematic structural and transport characterizations of these infinite-layer nickelate thin films will also be discussed in detail.
1. D. Li et al., Nature 572, 624 (2019).
2. A. S. Botana & M. Norman, Phys. Rev. X 10, 011024 (2020).
3. D. Li et al., Phys. Rev. Lett. 125, 027001 (2020).
4. K. Lee et al., APL Mater. 8, 041107 (2020).
5. K. Lee et al., arXiv:2203.02580 (2022).
1. D. Li et al., Nature 572, 624 (2019).
2. A. S. Botana & M. Norman, Phys. Rev. X 10, 011024 (2020).
3. D. Li et al., Phys. Rev. Lett. 125, 027001 (2020).
4. K. Lee et al., APL Mater. 8, 041107 (2020).
5. K. Lee et al., arXiv:2203.02580 (2022).
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Presenters
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Kyuho Lee
Stanford University, Stanford University, SLAC National Accelerator Laboratory
Authors
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Kyuho Lee
Stanford University, Stanford University, SLAC National Accelerator Laboratory
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Bai Yang Wang
Stanford University, Stanford University, SLAC National Accelerator Laboratory
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Yonghun Lee
Stanford University, Stanford University, SLAC National Accelerator Laboratory
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Berit H Goodge
Cornell University
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Woojin Kim
Stanford University, Stanford Institute for Materials and Energy Sciences
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Lena F Kourkoutis
Cornell University, School of Applied and Engineering Physics, Cornell University
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Harold Hwang
Stanford Univ, Stanford University