[19p-Z14-1~18] 6.3 酸化物エレクトロニクス

△ [19p-Z14-10] Superconducting infinite layer nickelate thin films via a soft chemistry approach

〇(PC)Motoki Osada^1,2、Bai Y. Wang^1,2、Danfeng Li^1,2、Kyuho Lee^1,2、Shannon Harvey^1,2、Berit Goodge³、Lena Kourkoutis³、Harold Hwang^1,2 (1.Stanford Univ.、2.SLAC、3.Cornell Univ.)

キーワード：nickelate, superconductor, thin film

Ever since their discovery, superconductivity in cuprates has motivated the search for materials with analogous electronic or atomic structure [1]. Recently, superconductivity was observed in nanoscale infinite layer nickelate thin films of Nd_0.8Sr_0.2NiO₂, epitaxially stabilized on SrTiO₃ substrates via topotactic reduction from the perovskite precursor phase [2]. Here we present how soft chemistry approaches can be used to synthesize superconducting infinite layer nickelates from their perovskite precursor phase, using topotactic reactions. We will discuss our preliminary understanding of aspects that are similar and different from the cuprates, as well as initial exploration of the compositional variations accessible in this materials system [2-5].
[1] J.G. Bednorz, and K. A. Muller, Z Phys. B 64, 189-194 (1986).
[2] D. Li et al., Nature 572, 624-627 (2019).
[3] D. Li et al., Phys. Rev. Lett. 125, 027001 (2020).
[4] M. Osada et al., Nano Lett. 20, 5735 (2020).
[5] M. Osada et al., Phys. Rev. Materials 4, 121801(R) (2020).
*Supported by DOE BES MSD (DE-AC02-76SF00515), the Moore Foundation (GBMF4415), and DOD AFOSR (FA 9550-16-1-0305).