Superconducting Dome in Nd_{1-x}Sr_{x}NiO_{2} Infinite Layer Films

Danfeng Li; Bai Yang Wang; Kyuho Lee; Shannon P Harvey; Motoki Osada; Berit H Goodge; Lena F Kourkoutis; Harold Y Hwang

doi:10.1103/PhysRevLett.125.027001

Superconducting Dome in Nd_{1-x}Sr_{x}NiO_{2} Infinite Layer Films

Phys Rev Lett. 2020 Jul 10;125(2):027001. doi: 10.1103/PhysRevLett.125.027001.

Authors

Danfeng Li^{1

2}, Bai Yang Wang^{1

3}, Kyuho Lee^{1

3}, Shannon P Harvey^{1

2}, Motoki Osada^{1

4}, Berit H Goodge^{5

6}, Lena F Kourkoutis^{5

6}, Harold Y Hwang^{1

2}

Affiliations

¹ Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA.
² Department of Applied Physics, Stanford University, Stanford, California 94305, USA.
³ Department of Physics, Stanford University, Stanford, California 94305, USA.
⁴ Department of Materials Science and Engineering, Stanford University, Stanford, California 94305, USA.
⁵ School of Applied and Engineering Physics, Cornell University, Ithaca, New York 14853, USA.
⁶ Kavli Institute at Cornell for Nanoscale Science, Ithaca, New York 14853, USA.

PMID: 32701320
DOI: 10.1103/PhysRevLett.125.027001

Abstract

We report the phase diagram of Nd_{1-x}Sr_{x}NiO_{2} infinite layer thin films grown on SrTiO_{3}. 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 electronlike and holelike bands, consistent with band structure calculations.