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Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.

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At least 325 records · Page 18
All sourcesNASA NTRSDOE OSTI
DOE OSTI2021

Anomalously strong near-neighbor attraction in doped 1D cuprate chains

In the cuprates, one-dimensional (1D) chain compounds provide a distinctive opportunity to understand the microscopic physics, owing to the availability of reliable theories. However, progress has been limited by the challenge of controllably doping these materials. We report the synthesis and spectroscopic analysis of the 1D cuprate Ba 2-x Sr x CuO 3+δ over a wide range of hole doping. Our angle-resolved photoemission experiments reveal the doping evolution of the holon and spinon branches. We identify a prominent folding branch whose intensity fails to match predictions of the simple Hubbard model. An additional strong near-neighbor attraction, which may arise from coupling to phonons, quantitatively explains experiments for all accessible doping levels. Furthermore, considering structural and quantum chemistry similarities among cuprates, this attraction may play a similarly important role in high-temperature cuprate superconductors.

1D Chain↗
DOE OSTI2022

Fusion Pilot Plant performance and the role of a Sustained High Power Density tokamak

Recent U.S. fusion development strategy reports all recommend that the U.S. should pursue innovative science and technology to enable construction of a Fusion Pilot Plant (FPP) that produces net electricity from fusion at low capital cost. Compact tokamaks have been proposed as a means of potentially reducing the capital cost of a fusion pilot plant. However, compact steady-state tokamak FPPs face the challenge of integrating a high fraction of self-driven current with high core confinement, plasma pressure, and high divertor parallel heat flux. This integration is sufficiently challenging that a dedicated sustained-high-power-density (SHPD) tokamak facility is proposed by the U.S. community as the optimal way to close this integration gap. Performance projections for the steady-state tokamak FPP regime are presented and a preliminary SHPD device with substantial flexibility in lower aspect ratio (A=2-2.5), shaping, and divertor configuration to narrow gaps to a FPP is described.

core-edge integration↗
DOE OSTI2021

Hole-like Fermi surface in the overdoped non-superconducting Bi 1.8 Pb 0.4 Sr 2 CuO 6+δ

In high-temperature cuprate superconductors, the anti-ferromagnetic spin fluctuations are thought to have a very important role in naturally producing an attractive interaction between the electrons in the d-wave channel. The connection between superconductivity and spin fluctuations is expected to be especially consequential at the overdoped end point of the superconducting dome. In some materials, that point seems to coincide with a Lifshitz transition, where the Fermi surface changes from the hole-like centered at $(\pi, \pi)$ to the electron-like, centered at the Γ point causing a loss of large momentum anti-ferromagnetic fluctuations. In this work, we study the doping dependence of the electronic structure of Bi 1.8 Pb 0.4 Sr 2 CuO$_{6+\delta}$ in angle-resolved photoemission and find that the superconductivity vanishes at lower doping than that at which the Lifshitz transition occurs. This requires a more detailed re-examination of a spin fluctuation scenario.

75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND↗
DOE OSTI2020

Materials Data on Ba2YbSbO6 by Materials Project

Yb(BaO3)2Sb is High-temperature superconductor-derived structured and crystallizes in the cubic Fm-3m space group. The structure is three-dimensional and consists of four antimony molecules, four ytterbium molecules, and one BaO3 framework. In the BaO3 framework, Ba2+ is bonded to six equivalent O2- atoms to form corner-sharing BaO6 octahedra. The corner-sharing octahedral tilt angles are 0°. All Ba–O bond lengths are 2.33 Å. O2- is bonded in a linear geometry to two equivalent Ba2+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on WO3 by Materials Project

WO3 is High-temperature superconductor-like structured and crystallizes in the tetragonal P4/ncc space group. The structure is three-dimensional. W6+ is bonded to six O2- atoms to form corner-sharing WO6 octahedra. The corner-sharing octahedra tilt angles range from 0–12°. There are a spread of W–O bond distances ranging from 1.84–2.06 Å. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded in a linear geometry to two equivalent W6+ atoms. In the second O2- site, O2- is bonded in a linear geometry to two equivalent W6+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on WO3 by Materials Project

WO3 is High-temperature superconductor-like structured and crystallizes in the monoclinic P2_1/c space group. The structure is three-dimensional. W6+ is bonded to six O2- atoms to form corner-sharing WO6 octahedra. The corner-sharing octahedra tilt angles range from 9–12°. There are a spread of W–O bond distances ranging from 1.85–2.05 Å. There are three inequivalent O2- sites. In the first O2- site, O2- is bonded in a linear geometry to two equivalent W6+ atoms. In the second O2- site, O2- is bonded in a linear geometry to two equivalent W6+ atoms. In the third O2- site, O2- is bonded in a linear geometry to two equivalent W6+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on WO3 by Materials Project

WO3 is High-temperature superconductor-like structured and crystallizes in the tetragonal P4/nmm space group. The structure is three-dimensional. W6+ is bonded to six O2- atoms to form corner-sharing WO6 octahedra. The corner-sharing octahedral tilt angles are 0°. There are a spread of W–O bond distances ranging from 1.84–2.07 Å. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded in a linear geometry to two equivalent W6+ atoms. In the second O2- site, O2- is bonded in a linear geometry to two equivalent W6+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on CaPbF6 by Materials Project

CaPbF6 is High-temperature superconductor-derived structured and crystallizes in the cubic Fm-3m space group. The structure is three-dimensional. Ca2+ is bonded to six equivalent F1- atoms to form CaF6 octahedra that share corners with six equivalent PbF6 octahedra. The corner-sharing octahedral tilt angles are 0°. All Ca–F bond lengths are 2.27 Å. Pb4+ is bonded to six equivalent F1- atoms to form PbF6 octahedra that share corners with six equivalent CaF6 octahedra. The corner-sharing octahedral tilt angles are 0°. All Pb–F bond lengths are 2.10 Å. F1- is bonded in a linear geometry to one Ca2+ and one Pb4+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on CaTiF6 by Materials Project

CaTiF6 is High-temperature superconductor-derived structured and crystallizes in the trigonal R-3m space group. The structure is three-dimensional. Ca2+ is bonded to six equivalent F1- atoms to form CaF6 octahedra that share corners with six equivalent TiF6 octahedra. The corner-sharing octahedral tilt angles are 0°. All Ca–F bond lengths are 2.28 Å. Ti4+ is bonded to six equivalent F1- atoms to form TiF6 octahedra that share corners with six equivalent CaF6 octahedra. The corner-sharing octahedral tilt angles are 0°. All Ti–F bond lengths are 1.89 Å. F1- is bonded in a linear geometry to one Ca2+ and one Ti4+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Nd2O3 by Materials Project

Nd2O3 is High-temperature superconductor-like structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional and consists of one neodimio molecule and one NdO3 framework. In the NdO3 framework, Nd3+ is bonded to six equivalent O2- atoms to form corner-sharing NdO6 octahedra. The corner-sharing octahedral tilt angles are 0°. All Nd–O bond lengths are 2.25 Å. O2- is bonded in a linear geometry to two equivalent Nd3+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on La2O3 by Materials Project

La2O3 is High-temperature superconductor-like structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional and consists of one lanthanum molecule and one LaO3 framework. In the LaO3 framework, La3+ is bonded to six equivalent O2- atoms to form corner-sharing LaO6 octahedra. The corner-sharing octahedral tilt angles are 0°. All La–O bond lengths are 2.29 Å. O2- is bonded in a linear geometry to two equivalent La3+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on TaO2F by Materials Project

TaO2F is High-temperature superconductor-derived structured and crystallizes in the tetragonal P4_2/mmc space group. The structure is three-dimensional. Ta5+ is bonded to four O2- and two equivalent F1- atoms to form corner-sharing TaO4F2 octahedra. The corner-sharing octahedral tilt angles are 0°. There is two shorter (1.94 Å) and two longer (1.99 Å) Ta–O bond length. Both Ta–F bond lengths are 1.99 Å. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded in a linear geometry to two equivalent Ta5+ atoms. In the second O2- site, O2- is bonded in a linear geometry to two equivalent Ta5+ atoms. There are two inequivalent F1- sites. In the first F1- site, F1- is bonded in a linear geometry to two equivalent Ta5+ atoms. In the second F1- site, F1- is bonded in a linear geometry to two equivalent Ta5+ atoms. Both F–Ta bond lengths are 1.99 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on H(WO3)2 by Materials Project

(WO3)4H2 is High-temperature superconductor-derived structured and crystallizes in the cubic Fm-3m space group. The structure is three-dimensional and consists of four hydrogen molecules and one WO3 framework. In the WO3 framework, W+5.50+ is bonded to six equivalent O2- atoms to form corner-sharing WO6 octahedra. The corner-sharing octahedral tilt angles are 0°. All W–O bond lengths are 1.93 Å. O2- is bonded in a linear geometry to two equivalent W+5.50+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on TiOF2 by Materials Project

TiOF2 is High-temperature superconductor-derived structured and crystallizes in the tetragonal P4_2/mmc space group. The structure is three-dimensional. Ti4+ is bonded to two equivalent O2- and four F1- atoms to form corner-sharing TiO2F4 octahedra. The corner-sharing octahedral tilt angles are 0°. Both Ti–O bond lengths are 1.90 Å. There is two shorter (1.90 Å) and two longer (1.97 Å) Ti–F bond length. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded in a linear geometry to two equivalent Ti4+ atoms. In the second O2- site, O2- is bonded in a linear geometry to two equivalent Ti4+ atoms. Both O–Ti bond lengths are 1.90 Å. There are two inequivalent F1- sites. In the first F1- site, F1- is bonded in a linear geometry to two equivalent Ti4+ atoms. In the second F1- site, F1- is bonded in a linear geometry to two equivalent Ti4+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on ReO3 by Materials Project

ReO3 is High-temperature superconductor-like structured and crystallizes in the tetragonal P4/mbm space group. The structure is three-dimensional. Re6+ is bonded to six O2- atoms to form corner-sharing ReO6 octahedra. The corner-sharing octahedra tilt angles range from 0–6°. All Re–O bond lengths are 1.90 Å. There are four inequivalent O2- sites. In the first O2- site, O2- is bonded in a linear geometry to two equivalent Re6+ atoms. In the second O2- site, O2- is bonded in a linear geometry to two equivalent Re6+ atoms. In the third O2- site, O2- is bonded in a linear geometry to two equivalent Re6+ atoms. In the fourth O2- site, O2- is bonded in a linear geometry to two equivalent Re6+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on CdCO3 by Materials Project

CdCO3 is High-temperature superconductor-derived structured and crystallizes in the monoclinic C2/m space group. The structure is three-dimensional and consists of two methane molecules and one CdO3 framework. In the CdO3 framework, Cd2+ is bonded to six O2- atoms to form corner-sharing CdO6 octahedra. The corner-sharing octahedral tilt angles are 0°. There are two shorter (2.07 Å) and four longer (2.08 Å) Cd–O bond lengths. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded in a linear geometry to two equivalent Cd2+ atoms. In the second O2- site, O2- is bonded in a linear geometry to two equivalent Cd2+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on ZrFeF6 by Materials Project

ZrFeF6 is High-temperature superconductor-derived structured and crystallizes in the cubic Fm-3m space group. The structure is three-dimensional. Zr4+ is bonded to six equivalent F1- atoms to form ZrF6 octahedra that share corners with six equivalent FeF6 octahedra. The corner-sharing octahedral tilt angles are 0°. All Zr–F bond lengths are 2.05 Å. Fe2+ is bonded to six equivalent F1- atoms to form FeF6 octahedra that share corners with six equivalent ZrF6 octahedra. The corner-sharing octahedral tilt angles are 0°. All Fe–F bond lengths are 2.06 Å. F1- is bonded in a linear geometry to one Zr4+ and one Fe2+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on ZrCrF6 by Materials Project

CrZrF6 is High-temperature superconductor-derived structured and crystallizes in the cubic Fm-3m space group. The structure is three-dimensional. Zr4+ is bonded to six equivalent F1- atoms to form ZrF6 octahedra that share corners with six equivalent CrF6 octahedra. The corner-sharing octahedral tilt angles are 0°. All Zr–F bond lengths are 2.04 Å. Cr2+ is bonded to six equivalent F1- atoms to form CrF6 octahedra that share corners with six equivalent ZrF6 octahedra. The corner-sharing octahedral tilt angles are 0°. All Cr–F bond lengths are 2.12 Å. F1- is bonded in a linear geometry to one Zr4+ and one Cr2+ atom.

36 MATERIALS SCIENCE↗