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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 109 records · Page 6
All sourcesNASA NTRSDOE OSTI
DOE OSTI2022

Topological magnon band structure of emergent Landau levels in a skyrmion lattice

We report the motion of a spin excitation across topologically nontrivial magnetic order exhibits a deflection that is analogous to the effect of the Lorentz force on an electrically charged particle in an orbital magnetic field. We used polarized inelastic neutron scattering to investigate the propagation of magnons (i.e., bosonic collective spin excitations) in a lattice of skyrmion tubes in manganese silicide. For wave vectors perpendicular to the skyrmion tubes, the magnon spectra are consistent with the formation of finely spaced emergent Landau levels that are characteristic of the fictitious magnetic field used to account for the nontrivial topological winding of the skyrmion lattice. This provides evidence of a topological magnon band structure in reciprocal space, which is borne out of the nontrivial real-space topology of a magnetic order.

36 MATERIALS SCIENCE↗
DOE OSTI2023

Visualizing the atomic-scale origin of metallic behavior in Kondo insulators

A Kondo lattice is often electrically insulating at low temperatures. However, several recent experiments have detected signatures of bulk metallicity within this Kondo insulating phase. In this study, we visualized the real-space charge landscape within a Kondo lattice with atomic resolution using a scanning tunneling microscope. We discovered nanometer-scale puddles of metallic conduction electrons centered around uranium-site substitutions in the heavy-fermion compound uranium ruthenium silicide (URu 2 Si 2 ) and around samarium-site defects in the topological Kondo insulator samarium hexaboride (SmB 6 ). These defects disturbed the Kondo screening cloud, leaving behind a fingerprint of the metallic parent state. Our results suggest that the three-dimensional quantum oscillations measured in SmB 6 arise from Kondo-lattice defects, although we cannot exclude other explanations. Finally, our imaging technique could enable the development of atomic-scale charge sensors using heavy-fermion probes.

71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSIC↗
DOE OSTI2020

Assessing atomically thin delta-doping of silicon using mid-infrared ellipsometry

Hydrogen lithography has been used to template phosphine-based surface chemistry to fabricate atomic-scale devices, a process we abbreviate as atomic precision advanced manufacturing (APAM). In this work, we use mid-infrared variable angle spectroscopic ellipsometry (IR-VASE) to characterize single-nanometer thickness phosphorus dopant layers (δ-layers) in silicon made using APAM compatible processes. A large Drude response is directly attributable to theδ-layer and can be used for nondestructive monitoring of the condition of the APAM layer when integrating additional processing steps. Furthermore, the carrier density and mobility extracted from our room temperature IR-VASE measurements are consistent with cryogenic magneto-transport measurements, showing that APAM δ-layers function at room temperature. Finally, the permittivity extracted from these measurements shows that the doping in the APAM δ-layers is so large that their low-frequency in-plane response is reminiscent of a silicide. However, there is no indication of a plasma resonance, likely due to reduced dimensionality and/or low scattering lifetime.

2D material↗
DOE OSTI2020

Materials Data on Cd3In by Materials Project

Cd3In is Uranium Silicide structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. Cd is bonded to eight equivalent Cd and four equivalent In atoms to form CdCd8In4 cuboctahedra that share corners with twelve equivalent CdCd8In4 cuboctahedra, edges with eight equivalent InCd12 cuboctahedra, edges with sixteen equivalent CdCd8In4 cuboctahedra, faces with four equivalent InCd12 cuboctahedra, and faces with fourteen equivalent CdCd8In4 cuboctahedra. All Cd–Cd bond lengths are 3.25 Å. All Cd–In bond lengths are 3.25 Å. In is bonded to twelve equivalent Cd atoms to form InCd12 cuboctahedra that share corners with twelve equivalent InCd12 cuboctahedra, edges with twenty-four equivalent CdCd8In4 cuboctahedra, faces with six equivalent InCd12 cuboctahedra, and faces with twelve equivalent CdCd8In4 cuboctahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on AlPt3 by Materials Project

Pt3Al is Uranium Silicide structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. Pt is bonded to eight equivalent Pt and four equivalent Al atoms to form distorted PtAl4Pt8 cuboctahedra that share corners with twelve equivalent PtAl4Pt8 cuboctahedra, edges with eight equivalent AlPt12 cuboctahedra, edges with sixteen equivalent PtAl4Pt8 cuboctahedra, faces with four equivalent AlPt12 cuboctahedra, and faces with fourteen equivalent PtAl4Pt8 cuboctahedra. All Pt–Pt bond lengths are 2.77 Å. All Pt–Al bond lengths are 2.77 Å. Al is bonded to twelve equivalent Pt atoms to form AlPt12 cuboctahedra that share corners with twelve equivalent AlPt12 cuboctahedra, edges with twenty-four equivalent PtAl4Pt8 cuboctahedra, faces with six equivalent AlPt12 cuboctahedra, and faces with twelve equivalent PtAl4Pt8 cuboctahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on HoGa3 by Materials Project

HoGa3 is Uranium Silicide structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. Ho is bonded to twelve equivalent Ga atoms to form HoGa12 cuboctahedra that share corners with twelve equivalent HoGa12 cuboctahedra, edges with twenty-four equivalent GaHo4Ga8 cuboctahedra, faces with six equivalent HoGa12 cuboctahedra, and faces with twelve equivalent GaHo4Ga8 cuboctahedra. All Ho–Ga bond lengths are 3.01 Å. Ga is bonded to four equivalent Ho and eight equivalent Ga atoms to form distorted GaHo4Ga8 cuboctahedra that share corners with twelve equivalent GaHo4Ga8 cuboctahedra, edges with eight equivalent HoGa12 cuboctahedra, edges with sixteen equivalent GaHo4Ga8 cuboctahedra, faces with four equivalent HoGa12 cuboctahedra, and faces with fourteen equivalent GaHo4Ga8 cuboctahedra. All Ga–Ga bond lengths are 3.01 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Nb3Si by Materials Project

Nb3Si is Uranium Silicide structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. Nb is bonded to eight equivalent Nb and four equivalent Si atoms to form NbNb8Si4 cuboctahedra that share corners with twelve equivalent NbNb8Si4 cuboctahedra, edges with eight equivalent SiNb12 cuboctahedra, edges with sixteen equivalent NbNb8Si4 cuboctahedra, faces with four equivalent SiNb12 cuboctahedra, and faces with fourteen equivalent NbNb8Si4 cuboctahedra. All Nb–Nb bond lengths are 2.89 Å. All Nb–Si bond lengths are 2.89 Å. Si is bonded to twelve equivalent Nb atoms to form SiNb12 cuboctahedra that share corners with twelve equivalent SiNb12 cuboctahedra, edges with twenty-four equivalent NbNb8Si4 cuboctahedra, faces with six equivalent SiNb12 cuboctahedra, and faces with twelve equivalent NbNb8Si4 cuboctahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on TaRh3 by Materials Project

Rh3Ta is Uranium Silicide structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. Ta is bonded to twelve equivalent Rh atoms to form TaRh12 cuboctahedra that share corners with twelve equivalent TaRh12 cuboctahedra, edges with twenty-four equivalent RhTa4Rh8 cuboctahedra, faces with six equivalent TaRh12 cuboctahedra, and faces with twelve equivalent RhTa4Rh8 cuboctahedra. All Ta–Rh bond lengths are 2.76 Å. Rh is bonded to four equivalent Ta and eight equivalent Rh atoms to form distorted RhTa4Rh8 cuboctahedra that share corners with twelve equivalent RhTa4Rh8 cuboctahedra, edges with eight equivalent TaRh12 cuboctahedra, edges with sixteen equivalent RhTa4Rh8 cuboctahedra, faces with four equivalent TaRh12 cuboctahedra, and faces with fourteen equivalent RhTa4Rh8 cuboctahedra. All Rh–Rh bond lengths are 2.76 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on HfRh3 by Materials Project

Rh3Hf is Uranium Silicide structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. Hf is bonded to twelve equivalent Rh atoms to form a mixture of corner and face-sharing HfRh12 cuboctahedra. All Hf–Rh bond lengths are 2.79 Å. Rh is bonded in a distorted square co-planar geometry to four equivalent Hf atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on UIr3 by Materials Project

UIr3 is Uranium Silicide structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. U is bonded to twelve equivalent Ir atoms to form a mixture of face and corner-sharing UIr12 cuboctahedra. All U–Ir bond lengths are 2.86 Å. Ir is bonded in a distorted square co-planar geometry to four equivalent U atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on FeIr3 by Materials Project

FeIr3 is Uranium Silicide structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. Fe is bonded to twelve equivalent Ir atoms to form FeIr12 cuboctahedra that share corners with twelve equivalent FeIr12 cuboctahedra, edges with twenty-four equivalent IrFe4Ir8 cuboctahedra, faces with six equivalent FeIr12 cuboctahedra, and faces with twelve equivalent IrFe4Ir8 cuboctahedra. All Fe–Ir bond lengths are 2.68 Å. Ir is bonded to four equivalent Fe and eight equivalent Ir atoms to form IrFe4Ir8 cuboctahedra that share corners with twelve equivalent IrFe4Ir8 cuboctahedra, edges with eight equivalent FeIr12 cuboctahedra, edges with sixteen equivalent IrFe4Ir8 cuboctahedra, faces with four equivalent FeIr12 cuboctahedra, and faces with fourteen equivalent IrFe4Ir8 cuboctahedra. All Ir–Ir bond lengths are 2.68 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on VIr3 by Materials Project

Ir3V is Uranium Silicide structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. V is bonded to twelve equivalent Ir atoms to form VIr12 cuboctahedra that share corners with twelve equivalent VIr12 cuboctahedra, edges with twenty-four equivalent IrV4Ir8 cuboctahedra, faces with six equivalent VIr12 cuboctahedra, and faces with twelve equivalent IrV4Ir8 cuboctahedra. All V–Ir bond lengths are 2.71 Å. Ir is bonded to four equivalent V and eight equivalent Ir atoms to form distorted IrV4Ir8 cuboctahedra that share corners with twelve equivalent IrV4Ir8 cuboctahedra, edges with eight equivalent VIr12 cuboctahedra, edges with sixteen equivalent IrV4Ir8 cuboctahedra, faces with four equivalent VIr12 cuboctahedra, and faces with fourteen equivalent IrV4Ir8 cuboctahedra. All Ir–Ir bond lengths are 2.71 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on La3Al by Materials Project

AlLa3 is Uranium Silicide structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. La is bonded to eight equivalent La and four equivalent Al atoms to form distorted LaLa8Al4 cuboctahedra that share corners with twelve equivalent LaLa8Al4 cuboctahedra, edges with eight equivalent AlLa12 cuboctahedra, edges with sixteen equivalent LaLa8Al4 cuboctahedra, faces with four equivalent AlLa12 cuboctahedra, and faces with fourteen equivalent LaLa8Al4 cuboctahedra. All La–La bond lengths are 3.52 Å. All La–Al bond lengths are 3.52 Å. Al is bonded to twelve equivalent La atoms to form AlLa12 cuboctahedra that share corners with twelve equivalent AlLa12 cuboctahedra, edges with twenty-four equivalent LaLa8Al4 cuboctahedra, faces with six equivalent AlLa12 cuboctahedra, and faces with twelve equivalent LaLa8Al4 cuboctahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on TiIr3 by Materials Project

Ir3Ti is Uranium Silicide structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. Ti is bonded to twelve equivalent Ir atoms to form TiIr12 cuboctahedra that share corners with twelve equivalent TiIr12 cuboctahedra, edges with twenty-four equivalent IrTi4Ir8 cuboctahedra, faces with six equivalent TiIr12 cuboctahedra, and faces with twelve equivalent IrTi4Ir8 cuboctahedra. All Ti–Ir bond lengths are 2.74 Å. Ir is bonded to four equivalent Ti and eight equivalent Ir atoms to form distorted IrTi4Ir8 cuboctahedra that share corners with twelve equivalent IrTi4Ir8 cuboctahedra, edges with eight equivalent TiIr12 cuboctahedra, edges with sixteen equivalent IrTi4Ir8 cuboctahedra, faces with four equivalent TiIr12 cuboctahedra, and faces with fourteen equivalent IrTi4Ir8 cuboctahedra. All Ir–Ir bond lengths are 2.74 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on LiAl3 by Materials Project

Al3Li is Uranium Silicide structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. Li is bonded to twelve equivalent Al atoms to form LiAl12 cuboctahedra that share corners with twelve equivalent LiAl12 cuboctahedra, edges with twenty-four equivalent AlLi4Al8 cuboctahedra, faces with six equivalent LiAl12 cuboctahedra, and faces with twelve equivalent AlLi4Al8 cuboctahedra. All Li–Al bond lengths are 2.85 Å. Al is bonded to four equivalent Li and eight equivalent Al atoms to form distorted AlLi4Al8 cuboctahedra that share corners with twelve equivalent AlLi4Al8 cuboctahedra, edges with eight equivalent LiAl12 cuboctahedra, edges with sixteen equivalent AlLi4Al8 cuboctahedra, faces with four equivalent LiAl12 cuboctahedra, and faces with fourteen equivalent AlLi4Al8 cuboctahedra. All Al–Al bond lengths are 2.85 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on PuAl3 by Materials Project

PuAl3 is Uranium Silicide structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. Pu is bonded to twelve equivalent Al atoms to form PuAl12 cuboctahedra that share corners with twelve equivalent PuAl12 cuboctahedra, edges with twenty-four equivalent AlPu4Al8 cuboctahedra, faces with six equivalent PuAl12 cuboctahedra, and faces with twelve equivalent AlPu4Al8 cuboctahedra. All Pu–Al bond lengths are 2.96 Å. Al is bonded to four equivalent Pu and eight equivalent Al atoms to form AlPu4Al8 cuboctahedra that share corners with twelve equivalent AlPu4Al8 cuboctahedra, edges with eight equivalent PuAl12 cuboctahedra, edges with sixteen equivalent AlPu4Al8 cuboctahedra, faces with four equivalent PuAl12 cuboctahedra, and faces with fourteen equivalent AlPu4Al8 cuboctahedra. All Al–Al bond lengths are 2.96 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Sm3Al by Materials Project

Sm3Al is Uranium Silicide structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. Sm is bonded to eight equivalent Sm and four equivalent Al atoms to form distorted SmSm8Al4 cuboctahedra that share corners with twelve equivalent SmSm8Al4 cuboctahedra, edges with eight equivalent AlSm12 cuboctahedra, edges with sixteen equivalent SmSm8Al4 cuboctahedra, faces with four equivalent AlSm12 cuboctahedra, and faces with fourteen equivalent SmSm8Al4 cuboctahedra. All Sm–Sm bond lengths are 3.43 Å. All Sm–Al bond lengths are 3.43 Å. Al is bonded to twelve equivalent Sm atoms to form AlSm12 cuboctahedra that share corners with twelve equivalent AlSm12 cuboctahedra, edges with twenty-four equivalent SmSm8Al4 cuboctahedra, faces with six equivalent AlSm12 cuboctahedra, and faces with twelve equivalent SmSm8Al4 cuboctahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Tb3Al by Materials Project

Tb3Al is Uranium Silicide structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. Tb is bonded to eight equivalent Tb and four equivalent Al atoms to form distorted TbTb8Al4 cuboctahedra that share corners with twelve equivalent TbTb8Al4 cuboctahedra, edges with eight equivalent AlTb12 cuboctahedra, edges with sixteen equivalent TbTb8Al4 cuboctahedra, faces with four equivalent AlTb12 cuboctahedra, and faces with fourteen equivalent TbTb8Al4 cuboctahedra. All Tb–Tb bond lengths are 3.38 Å. All Tb–Al bond lengths are 3.38 Å. Al is bonded to twelve equivalent Tb atoms to form AlTb12 cuboctahedra that share corners with twelve equivalent AlTb12 cuboctahedra, edges with twenty-four equivalent TbTb8Al4 cuboctahedra, faces with six equivalent AlTb12 cuboctahedra, and faces with twelve equivalent TbTb8Al4 cuboctahedra.

36 MATERIALS SCIENCE↗