Evidence for d-wave superconductivity of infinite-layer nickelates from low-energy electrodynamics

Cheng，Bing1; Cheng，Di1; Lee，Kyuho2,3; Luo，Liang1; Chen，Zhuoyu2,4,5; Lee，Yonghun2,4; Wang，Bai Yang2,3; Mootz，Martin1,6; Perakis，Ilias E.7; Shen，Zhi Xun2,3,4; Hwang，Harold Y.2,4; Wang，Jigang1,6

2024

10.1038/s41563-023-01766-z

Nature Materials   影响因子和分区

1476-1122

1476-4660

The discovery of superconductivity in infinite-layer nickelates established another category of unconventional superconductors that shares structural and electronic similarities with cuprates. However, key issues of the superconducting pairing symmetry, gap amplitude and superconducting fluctuations are yet to be addressed. Here we utilize static and ultrafast terahertz spectroscopy to address these. We demonstrate that the equilibrium terahertz conductivity and non-equilibrium terahertz responses of an optimally Sr-doped nickelate film (superconducting transition temperature of T = 17 K) are in line with the electrodynamics of d-wave superconductivity in the dirty limit. The gap-to-T ratio (2Δ/k T ) is found to be 3.4, indicating that the superconductivity falls in the weak coupling regime. In addition, we observed substantial superconducting fluctuations near T that do not extend into the deep normal state as the optimally hole-doped cuprates do. Our results support a d-wave system that closely resembles the electron-doped cuprates.

SCI ; EI

英语

其他

MATERIALS SCIENCE

2-s2.0-85181466636

Scopus

1.Ames National Laboratory,Ames,United States
2.Stanford Institute for Materials and Energy Sciences,SLAC National Accelerator Laboratory,Menlo Park,United States
3.Department of Physics,Stanford University,Stanford,United States
4.Department of Applied Physics,Stanford University,Stanford,United States
5.Department of Physics,Southern University of Science and Technology,Shenzhen,China
6.Department of Physics and Astronomy,Iowa State University,Ames,United States
7.Department of Physics,University of Alabama at Birmingham,Birmingham,United States

Cheng，Bing,Cheng，Di,Lee，Kyuho,et al. Evidence for d-wave superconductivity of infinite-layer nickelates from low-energy electrodynamics[J]. Nature Materials,2024.

Cheng，Bing.,Cheng，Di.,Lee，Kyuho.,Luo，Liang.,Chen，Zhuoyu.,...&Wang，Jigang.(2024).Evidence for d-wave superconductivity of infinite-layer nickelates from low-energy electrodynamics.Nature Materials.

Cheng，Bing,et al."Evidence for d-wave superconductivity of infinite-layer nickelates from low-energy electrodynamics".Nature Materials (2024).