Related Experiment Video
Updated: Jul 23, 2025
11:07
Synthesis of Non-uniformly Pr-doped SrTiO3 Ceramics and Their Thermoelectric Properties
Published on: August 15, 2015
9.9K
Linear-in-temperature resistivity for optimally superconducting (Nd,Sr)NiO2.
Kyuho Lee1,2, Bai Yang Wang3,4, Motoki Osada3,5
1Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, CA, USA. kyuho@stanford.edu.
Nature
|July 12, 2023
Summary
Researchers synthesized defect-free infinite-layer nickelates, revealing normal state properties similar to copper oxides. This advancement enhances superconductivity in nickelates, suggesting a convergence between these superconducting families.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Superconductivity
Background:
- Superconductivity near strongly correlated phases is key to understanding emergent phenomena.
- Layered nickelates show promise for superconductivity, but materials limitations hinder research.
- Defects in infinite-layer nickelate films complicate transport measurements.
Purpose of the Study:
- To overcome materials limitations in infinite-layer nickelates.
- To investigate the normal state properties of defect-free nickelates.
- To understand the relationship between defects and superconductivity in nickelates.
Main Methods:
- Synthesized Nd1-xSrxNiO2 thin films on a novel substrate ((LaAlO3)0.3(Sr2TaAlO6)0.7).
- Achieved synthesis essentially free from extended defects.
- Performed transport measurements on the defect-minimized nickelate series.
Main Results:
- Defect-free nickelates exhibit distinct normal state resistivity behaviors (upturn, linear, quadratic) across doping levels.
- Observed phenomenological similarities to copper oxides, despite electronic structure differences.
- Enhanced superconducting transition temperature and doping range in defect-minimized nickelates.
Conclusions:
- Reducing disorder in nickelates reveals electronic properties converging with copper oxides.
- The novel substrate enables high-quality synthesis of infinite-layer nickelates.
- These findings pave the way for deeper understanding of nickelate superconductivity.
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