We synthesized bulk Sr-doped Nd1-xSrxNiO2 (x=0,0.1,0.2) infinite layer nickelates, finding them to be semiconducting and nonmagnetic, thus challenging current theoretical understanding.
Significance and Impact
Synthesis of Ni1+-containing phases is challenging; our approach yields reproducible materials, offering a means to understanding differences between superconducting films and non-superconducting bulk materials.
- Highly crystalline Nd1-xSrxNiO3 precursors made by soft-chemistry and high-pressure O2 annealing are necessary to achieve high-quality infinite layer phases.
- Electron transport measurements show no sign of superconductivity while neutron diffraction shows no evidence for long-range magnetic ordering.
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The U. S. Department of Energy Office of Science’s Advanced Photon Source (APS) at Argonne National Laboratory is one of the world’s most productive X-ray light source facilities. The APS provides high-brightness X-ray beams to a diverse community of researchers in materials science, chemistry, condensed matter physics, the life and environmental sciences, and applied research. These X-rays are ideally suited for explorations of materials and biological structures; elemental distribution; chemical, magnetic, electronic states; and a wide range of technologically important engineering systems from batteries to fuel injector sprays, all of which are the foundations of our nation’s economic, technological, and physical well-being. Each year, more than 5,000 researchers use the APS to produce over 2,000 publications detailing impactful discoveries, and solve more vital biological protein structures than users of any other X-ray light source research facility. APS scientists and engineers innovate technology that is at the heart of advancing accelerator and light-source operations. This includes the insertion devices that produce extreme-brightness X-rays prized by researchers, lenses that focus the X-rays down to a few nanometers, instrumentation that maximizes the way the X-rays interact with samples being studied, and software that gathers and manages the massive quantity of data resulting from discovery research at the APS.
This research used resources of the Advanced Photon Source, a U.S. DOE Office of Science User Facility operated for the DOE Office of Science by Argonne National Laboratory under Contract No. DE-AC02-06CH11357.
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