Superconducting Dome in Nd_1-xSr_xNiO₂ Infinite Layer Films

2020/03/31 by Danfeng Li, Bai Yang Wang, Kyuho Lee +5 · 1 citation
Physics and Astronomy · #cond-mat.supr-con #cond-mat.mtrl-sci

paper · pdf · doi:10.1103/physrevlett.125.027001

published as Phys. Rev. Lett. 125, 027001 (2020) · 18 pages (including Supplemental Material), 7 figures (including 4 supplemental figure)

arxiv created 2020/06/23 · arxiv updated 2020/07/14

Abstract

We report the phase diagram of Nd_1-xSr_xNiO₂ infinite layer thin films grown on SrTiO₃. A superconducting dome spanning 0.125 < x < 0.25 is found, remarkably similar to cuprates, albeit over a narrower doping window. However, while cuprate superconductivity is bounded by an insulator for underdoping and a metal for overdoping, here we observe weakly insulating behavior on either side of the dome. Furthermore, the normal state Hall coefficient is always small and proximate to a continuous zero crossing in doping and in temperature, in contrast to the ∼ 1/x dependence observed for cuprates. This suggests the presence of both electron- and hole-like bands, consistent with band structure calculations.

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