Superconducting Dome in Nd_{1-x}Sr_{x}NiO_{2} Infinite Layer Films.,Physical Review Letters

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Superconducting Dome in Nd_{1-x}Sr_{x}NiO_{2} Infinite Layer Films.
Physical Review Letters ( IF 8.1 ) Pub Date : 2020-07-07 , DOI: 10.1103/physrevlett.125.027001
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}

Affiliation

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

\sim 1 / x

dependence observed for cuprates. This suggests the presence of both electronlike and holelike bands, consistent with band structure calculations.

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