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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 37 records · Page 2
All sourcesNASA NTRSDOE OSTI
DOE OSTI2021

Robust Surface States and Coherence Phenomena in Magnetically Alloyed SmB 6

Samarium hexaboride is a candidate for the topological Kondo insulator state, in which Kondo coherence is predicted to give rise to an insulating gap spanned by topological surface states. Here we investigate the surface and bulk electronic properties of magnetically alloyed Sm 1-x M x B 6 (M = Ce, Eu), using angle-resolved photoemission spectroscopy and complementary characterization techniques. Remarkably, topologically nontrivial bulk and surface band structures are found to persist in highly modified samples with up to 30% Sm substitution and with an antiferromagnetic ground state in the case of Eu doping. The results are interpreted in terms of a hierarchy of energy scales, in which surface state emergence is linked to the formation of a direct Kondo gap, while low-temperature transport trends depend on the indirect gap.

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

Materials Data on LuB6 by Materials Project

LuB6 is Calcium hexaboride structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. Lu is bonded in a 1-coordinate geometry to twenty-four equivalent B atoms. All Lu–B bond lengths are 2.99 Å. B is bonded in a 1-coordinate geometry to four equivalent Lu and five equivalent B atoms. There is one shorter (1.62 Å) and four longer (1.74 Å) B–B bond length.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on KB6 by Materials Project

KB6 is Calcium hexaboride structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. K is bonded in a 1-coordinate geometry to twenty-four equivalent B atoms. All K–B bond lengths are 3.10 Å. B is bonded in a 1-coordinate geometry to four equivalent K and five equivalent B atoms. There is one shorter (1.68 Å) and four longer (1.80 Å) B–B bond length.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on PrB6 by Materials Project

PrB6 is Calcium hexaboride structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. Pr is bonded in a 1-coordinate geometry to twenty-four equivalent B atoms. All Pr–B bond lengths are 3.05 Å. B is bonded in a 1-coordinate geometry to four equivalent Pr and five equivalent B atoms. There is one shorter (1.66 Å) and four longer (1.76 Å) B–B bond length.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on TbB6 by Materials Project

TbB6 is Calcium hexaboride structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. Tb is bonded in a 1-coordinate geometry to twenty-four equivalent B atoms. All Tb–B bond lengths are 3.01 Å. B is bonded in a 1-coordinate geometry to four equivalent Tb and five equivalent B atoms. There is one shorter (1.63 Å) and four longer (1.75 Å) B–B bond length.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on ErB6 by Materials Project

ErB6 is Calcium hexaboride structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. Er is bonded in a 1-coordinate geometry to twenty-four equivalent B atoms. All Er–B bond lengths are 3.00 Å. B is bonded in a 1-coordinate geometry to four equivalent Er and five equivalent B atoms. There is one shorter (1.62 Å) and four longer (1.74 Å) B–B bond length.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on ThB6 by Materials Project

ThB6 is Calcium hexaboride structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. Th is bonded in a 1-coordinate geometry to twenty-four equivalent B atoms. All Th–B bond lengths are 3.02 Å. B is bonded in a 1-coordinate geometry to four equivalent Th and five equivalent B atoms. There is one shorter (1.62 Å) and four longer (1.76 Å) B–B bond length.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on NdB6 by Materials Project

NdB6 is Calcium hexaboride structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. Nd is bonded in a 1-coordinate geometry to twenty-four equivalent B atoms. All Nd–B bond lengths are 3.04 Å. B is bonded in a 1-coordinate geometry to four equivalent Nd and five equivalent B atoms. There is one shorter (1.65 Å) and four longer (1.76 Å) B–B bond length.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on EuB6 by Materials Project

EuB6 is Calcium hexaboride structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. Eu is bonded in a 1-coordinate geometry to twenty-four equivalent B atoms. All Eu–B bond lengths are 3.07 Å. B is bonded in a 1-coordinate geometry to four equivalent Eu and five equivalent B atoms. There is one shorter (1.68 Å) and four longer (1.76 Å) B–B bond length.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on CeB6 by Materials Project

CeB6 is Calcium hexaboride structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. Ce is bonded in a 1-coordinate geometry to twenty-four equivalent B atoms. All Ce–B bond lengths are 3.02 Å. B is bonded in a 1-coordinate geometry to four equivalent Ce and five equivalent B atoms. There is one shorter (1.63 Å) and four longer (1.75 Å) B–B bond length.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on YB6 by Materials Project

YB6 is Calcium hexaboride structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. Y is bonded in a 1-coordinate geometry to twenty-four equivalent B atoms. All Y–B bond lengths are 3.01 Å. B is bonded in a 1-coordinate geometry to four equivalent Y and five equivalent B atoms. There is one shorter (1.63 Å) and four longer (1.75 Å) B–B bond length.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on GdB6 by Materials Project

GdB6 is Calcium hexaboride structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. Gd is bonded in a 1-coordinate geometry to twenty-four equivalent B atoms. All Gd–B bond lengths are 3.02 Å. B is bonded in a 1-coordinate geometry to four equivalent Gd and five equivalent B atoms. There is one shorter (1.64 Å) and four longer (1.75 Å) B–B bond length.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on SrB6 by Materials Project

SrB6 is Calcium hexaboride structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. Sr is bonded in a 1-coordinate geometry to twenty-four equivalent B atoms. All Sr–B bond lengths are 3.09 Å. B is bonded in a 1-coordinate geometry to four equivalent Sr and five equivalent B atoms. There is one shorter (1.71 Å) and four longer (1.76 Å) B–B bond length.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on LaB6 by Materials Project

LaB6 is Calcium hexaboride structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. La is bonded in a 1-coordinate geometry to twenty-four equivalent B atoms. All La–B bond lengths are 3.05 Å. B is bonded in a 1-coordinate geometry to four equivalent La and five equivalent B atoms. There is one shorter (1.66 Å) and four longer (1.77 Å) B–B bond length.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on YbB6 by Materials Project

YbB6 is Calcium hexaboride structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. Yb is bonded in a 1-coordinate geometry to twenty-four equivalent B atoms. All Yb–B bond lengths are 3.04 Å. B is bonded in a 1-coordinate geometry to four equivalent Yb and five equivalent B atoms. There is one shorter (1.66 Å) and four longer (1.74 Å) B–B bond length.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on PuB6 by Materials Project

PuB6 is Calcium hexaboride structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. Pu6+ is bonded in a 1-coordinate geometry to twenty-four equivalent B1- atoms. All Pu–B bond lengths are 3.02 Å. B1- is bonded in a 1-coordinate geometry to four equivalent Pu6+ and five equivalent B1- atoms. There is one shorter (1.63 Å) and four longer (1.75 Å) B–B bond length.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on ZrB6 by Materials Project

ZrB6 is Calcium hexaboride structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. Zr is bonded in a 1-coordinate geometry to twenty-four equivalent B atoms. All Zr–B bond lengths are 2.98 Å. B is bonded in a 1-coordinate geometry to four equivalent Zr and five equivalent B atoms. There is one shorter (1.60 Å) and four longer (1.74 Å) B–B bond length.

36 MATERIALS SCIENCE↗