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At least 397 records · Page 22

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DOE OSTI2021

Isotropic nature of the metallic Kagome ferromagnet Fe 3 Sn 2 at high temperatures.

Anisotropy and competing exchange interactions have emerged as two central ingredients needed for centrosymmetric materials to exhibit topological spin textures. Fe 3 Sn 2 is thought to have these ingredients as well, as it has recently been discovered to host room temperature skyrmionic bubbles with an accompanying topological Hall effect. We present small-angle inelastic neutron scattering measurements that unambiguously show that Fe3Sn2 is an isotropic ferromagnet below TC ≈ 660 K to at least 480 K – the lower temperature threshold of our experimental configuration. Fe 3 Sn 2 is known to have competing magnetic exchange interactions, correlated electron behavior, weak magnetocrystalline anisotropy, and lattice anisotropy; all of these features are thought to play a role in stabilizing skyrmions in centrosymmetric systems. Our results reveal that at elevated temperatures, there is an absence of significant magnetocrystalline anisotropy and that the system behaves as a nearly ideal isotropic exchange interaction ferromagnet, with a spin stiffness D(T = 480 K) = 168 meV Å2, which extrapolates to a ground state spin stiffness D(T = 0 K) = 231 meV Å2.

36 MATERIALS SCIENCE↗

DOE OSTI2026

Neutrino and Electromagnetic Signatures from Superluminous Supernovae: A Case Study for SN 2017egm

Superluminous supernovae (SLSNe) are rare transients that are ∼10–100 times more luminous than ordinary stellar explosions, reaching peak optical luminosities ∼10 44 –10 45 erg s −1 . The energy source powering SLSNe remains uncertain. In this work, we explore the multiwavelength and multimessenger signatures of the scenario in which SLSNe are powered by a newly born millisecond magnetar. We model the dynamical evolution and emission from the coupled system comprised of the magnetar, wind, nebula, and supernova ejecta, consistently evaluating the pair multiplicity of the wind and nebula regions, and the bulk wind Lorentz factor governing the e + − e − injection spectra in the nebula. We compute the thermal and nonthermal electromagnetic signatures, neutrino signatures, and investigate their detection prospects. For SN 2017egm, the nearest observed SLSNe, our prediction for high-energy gamma rays matches the recent detection by the Fermi Large Area Telescope. For neutrinos, using SN 2017egm a canonical SLSNe, we find that in the era of the Vera C. Rubin Observatory, a stacking analysis with upcoming neutrino observatories can lead to 3σ detection significance of neutrino events from a population of SLSNe within a decade of operation.

Mukhopadhyay, Mainak [Fermi National Accelerator L↗

DOE OSTI2022

A Rapid Ionization Change in the Nebular-phase Spectra of the Type Ia SN 2011fe

Abstract We present three new spectra of the nearby Type Ia supernova (SN Ia) 2011fe covering ≈480–850 days after maximum light and show that the ejecta undergoes a rapid ionization shift at ∼500 days after explosion. The prominent Fe iii emission lines at ≈4600 Å are replaced with Fe i +Fe ii blends at ∼4400 Å and ∼5400 Å. The ≈7300 Å feature, which is produced by [Fe ii ]+[Ni ii ] at ≲400 days after explosion, is replaced by broad (≈±15,000 km s −1 ) symmetric [Ca ii ] emission. Models predict this ionization transition occurring ∼100 days later than what is observed, which we attribute to clumping in the ejecta. Finally, we use the nebular-phase spectra to test several proposed progenitor scenarios for SN 2011fe. Nondetections of H and He exclude nearby nondegenerate companions, [O i ] nondetections disfavor the violent merger of two white dwarfs, and the symmetric emission-line profiles favor a symmetric explosion.

79 ASTRONOMY AND ASTROPHYSICS↗

DOE OSTI2026

A Natural ≳100× Telescope: Discovery of the Strongly Lensed Type II SN 2025mkn at z = 1.37

We present the discovery of SN 2025mkn, a gravitationally lensed Type II supernova. First detected as a blue transient in Zwicky Transient Facility (ZTF), 0. "83 from a z = 0.42 elliptical galaxy, the follow-up SNIFS/UH2.2 m and LRIS/Keck spectra revealed absorption lines at z = 1.371. Later JWST NIRCam imaging shows that the bright transient is a close pair of point sources separated by 0. "07, and a 30 times fainter counterimage opposite the lens, for which NIRSpec reveals strong Hα emission also at z = 1.371. The lightcurves and spectra are consistent with the Type II supernova source being magnified ≳100 times, with ∼250 required to reconcile its luminosity with that of nearby events such as SN 2023ixf. Lens models are consistent with such high magnifications, and always show that the faint image arrived first (undetected in earlier ZTF imaging), consistent with the later spectral phase of this fainter image. A fourth image is also predicted and possibly detected in the NIRSpec data. Lightcurve-based time-delay measurements are not possible due to the first image being the faintest; however, the resolved NIRSpec spectra offer a future opportunity for time-delay cosmography through supernova phase measurements.

Strong gravitational lensing↗

DOE OSTI2020

Materials Data on Sn(HgSe2)2 by Materials Project

Hg2SnSe4 crystallizes in the tetragonal I-4 space group. The structure is three-dimensional. there are two inequivalent Hg2+ sites. In the first Hg2+ site, Hg2+ is bonded to four equivalent Se2- atoms to form HgSe4 tetrahedra that share corners with four equivalent HgSe4 tetrahedra and corners with four equivalent SnSe4 tetrahedra. All Hg–Se bond lengths are 2.73 Å. In the second Hg2+ site, Hg2+ is bonded to four equivalent Se2- atoms to form HgSe4 tetrahedra that share corners with four equivalent HgSe4 tetrahedra and corners with four equivalent SnSe4 tetrahedra. All Hg–Se bond lengths are 2.73 Å. Sn4+ is bonded to four equivalent Se2- atoms to form SnSe4 tetrahedra that share corners with eight HgSe4 tetrahedra. All Sn–Se bond lengths are 2.59 Å. Se2- is bonded in a trigonal non-coplanar geometry to two Hg2+ and one Sn4+ atom.

36 MATERIALS SCIENCE↗

DOE OSTI2020

Materials Data on Sn(PbO2)2 by Materials Project

Pb2SnO4 crystallizes in the orthorhombic Pbam space group. The structure is three-dimensional. there are two inequivalent Pb2+ sites. In the first Pb2+ site, Pb2+ is bonded in a distorted rectangular see-saw-like geometry to four O2- atoms. There are a spread of Pb–O bond distances ranging from 2.24–2.86 Å. In the second Pb2+ site, Pb2+ is bonded in a distorted rectangular see-saw-like geometry to four O2- atoms. There are a spread of Pb–O bond distances ranging from 2.24–2.84 Å. Sn4+ is bonded to six O2- atoms to form edge-sharing SnO6 octahedra. There are two shorter (2.08 Å) and four longer (2.14 Å) Sn–O bond lengths. There are three inequivalent O2- sites. In the first O2- site, O2- is bonded in a 3-coordinate geometry to two equivalent Pb2+ and two equivalent Sn4+ atoms. In the second O2- site, O2- is bonded in a 3-coordinate geometry to two equivalent Pb2+ and two equivalent Sn4+ atoms. In the third O2- site, O2- is bonded in a trigonal planar geometry to two Pb2+ and one Sn4+ atom.

36 MATERIALS SCIENCE↗

DOE OSTI2020

Materials Data on Sn(SbTe2)2 by Materials Project

SnSb2Te4 is MAX Phase-like structured and crystallizes in the trigonal R-3m space group. The structure is two-dimensional and consists of three SnSb2Te4 sheets oriented in the (0, 0, 1) direction. Sn2+ is bonded to six equivalent Te2- atoms to form SnTe6 octahedra that share corners with six equivalent SbTe6 octahedra, edges with six equivalent SnTe6 octahedra, and edges with six equivalent SbTe6 octahedra. The corner-sharing octahedral tilt angles are 1°. All Sn–Te bond lengths are 3.17 Å. Sb3+ is bonded to six Te2- atoms to form SbTe6 octahedra that share corners with three equivalent SnTe6 octahedra, edges with three equivalent SnTe6 octahedra, and edges with six equivalent SbTe6 octahedra. The corner-sharing octahedral tilt angles are 1°. There are three shorter (3.03 Å) and three longer (3.22 Å) Sb–Te bond lengths. There are two inequivalent Te2- sites. In the first Te2- site, Te2- is bonded in a 3-coordinate geometry to three equivalent Sb3+ atoms. In the second Te2- site, Te2- is bonded to three equivalent Sn2+ and three equivalent Sb3+ atoms to form a mixture of edge and corner-sharing TeSn3Sb3 octahedra. The corner-sharing octahedral tilt angles are 0°.

36 MATERIALS SCIENCE↗

DOE OSTI2020

Materials Data on Sn(PS3)2 by Materials Project

SnP2S6 crystallizes in the trigonal R3 space group. The structure is two-dimensional and consists of three SnP2S6 sheets oriented in the (0, 0, 1) direction. Sn2+ is bonded in an octahedral geometry to six S2- atoms. All Sn–S bond lengths are 2.62 Å. There are two inequivalent P5+ sites. In the first P5+ site, P5+ is bonded in a trigonal non-coplanar geometry to three equivalent S2- atoms. All P–S bond lengths are 2.04 Å. In the second P5+ site, P5+ is bonded in a trigonal non-coplanar geometry to three equivalent S2- atoms. All P–S bond lengths are 2.04 Å. There are two inequivalent S2- sites. In the first S2- site, S2- is bonded in a water-like geometry to one Sn2+ and one P5+ atom. In the second S2- site, S2- is bonded in a water-like geometry to one Sn2+ and one P5+ atom.

36 MATERIALS SCIENCE↗

DOE OSTI2020

Materials Data on Sn(BiTe2)2 by Materials Project

SnBi2Te4 is MAX Phase-like structured and crystallizes in the trigonal R-3m space group. The structure is two-dimensional and consists of three SnBi2Te4 sheets oriented in the (0, 0, 1) direction. Sn2+ is bonded to six equivalent Te2- atoms to form SnTe6 octahedra that share corners with six equivalent BiTe6 octahedra, edges with six equivalent SnTe6 octahedra, and edges with six equivalent BiTe6 octahedra. The corner-sharing octahedral tilt angles are 2°. All Sn–Te bond lengths are 3.20 Å. Bi3+ is bonded to six Te2- atoms to form BiTe6 octahedra that share corners with three equivalent SnTe6 octahedra, edges with three equivalent SnTe6 octahedra, and edges with six equivalent BiTe6 octahedra. The corner-sharing octahedral tilt angles are 2°. There are three shorter (3.09 Å) and three longer (3.30 Å) Bi–Te bond lengths. There are two inequivalent Te2- sites. In the first Te2- site, Te2- is bonded in a 6-coordinate geometry to three equivalent Bi3+ atoms. In the second Te2- site, Te2- is bonded to three equivalent Sn2+ and three equivalent Bi3+ atoms to form a mixture of corner and edge-sharing TeSn3Bi3 octahedra. The corner-sharing octahedral tilt angles are 0°.

36 MATERIALS SCIENCE↗

DOE OSTI2020

Materials Data on Sn(Mo3S4)2 by Materials Project

SnMo6S8 crystallizes in the trigonal R-3 space group. The structure is three-dimensional. Mo2+ is bonded to five S2- atoms to form a mixture of edge and corner-sharing MoS5 square pyramids. There are a spread of Mo–S bond distances ranging from 2.40–2.57 Å. Sn4+ is bonded in a body-centered cubic geometry to eight S2- atoms. There are two shorter (2.78 Å) and six longer (3.13 Å) Sn–S bond lengths. There are two inequivalent S2- sites. In the first S2- site, S2- is bonded in a 4-coordinate geometry to three equivalent Mo2+ and one Sn4+ atom. In the second S2- site, S2- is bonded in a 5-coordinate geometry to four equivalent Mo2+ and one Sn4+ atom.

36 MATERIALS SCIENCE↗

DOE OSTI2020

Materials Data on Sn(CO2)2 by Materials Project

SnC2O4 crystallizes in the monoclinic C2/c space group. The structure is one-dimensional and consists of two SnC2O4 ribbons oriented in the (1, 0, 1) direction. Sn2+ is bonded in a 4-coordinate geometry to four O2- atoms. There are two shorter (2.27 Å) and two longer (2.41 Å) Sn–O bond lengths. C3+ is bonded in a bent 120 degrees geometry to two O2- atoms. There is one shorter (1.26 Å) and one longer (1.28 Å) C–O bond length. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted single-bond geometry to one Sn2+ and one C3+ atom. In the second O2- site, O2- is bonded in a distorted bent 120 degrees geometry to one Sn2+ and one C3+ atom.

36 MATERIALS SCIENCE↗

DOE OSTI2020

Materials Data on Sn(S4I)4 by Materials Project

36 MATERIALS SCIENCE↗

DOE OSTI2020

Materials Data on SnC2(SN)2 by Materials Project

SnC2(NS)2 crystallizes in the triclinic P-1 space group. The structure is zero-dimensional and consists of two diisothiocyanatotin molecules. Sn2+ is bonded in a distorted L-shaped geometry to two N3- atoms. There are one shorter (2.23 Å) and one longer (2.30 Å) Sn–N bond lengths. There are two inequivalent C4+ sites. In the first C4+ site, C4+ is bonded in a distorted linear geometry to one N3- and one S2- atom. The C–N bond length is 1.18 Å. The C–S bond length is 1.62 Å. In the second C4+ site, C4+ is bonded in a distorted linear geometry to one N3- and one S2- atom. The C–N bond length is 1.18 Å. The C–S bond length is 1.63 Å. There are two inequivalent N3- sites. In the first N3- site, N3- is bonded in a distorted bent 150 degrees geometry to one Sn2+ and one C4+ atom. In the second N3- site, N3- is bonded in a linear geometry to one Sn2+ and one C4+ atom. There are two inequivalent S2- sites. In the first S2- site, S2- is bonded in a distorted single-bond geometry to one C4+ atom. In the second S2- site, S2- is bonded in a 1-coordinate geometry to one C4+ atom.

36 MATERIALS SCIENCE↗

DOE OSTI2020

Materials Data on Sn(S4I)4 by Materials Project

36 MATERIALS SCIENCE↗

DOE OSTI2020

Materials Data on Sn(PO3)2 by Materials Project

SnOP2O5 crystallizes in the orthorhombic Pbca space group. The structure is two-dimensional and consists of two SnOP2O5 sheets oriented in the (0, 0, 1) direction. Sn2+ is bonded in a 4-coordinate geometry to four O2- atoms. There are a spread of Sn–O bond distances ranging from 2.26–2.55 Å. There are two inequivalent P5+ sites. In the first P5+ site, P5+ is bonded to four O2- atoms to form corner-sharing PO4 tetrahedra. There are a spread of P–O bond distances ranging from 1.51–1.62 Å. In the second P5+ site, P5+ is bonded to four O2- atoms to form corner-sharing PO4 tetrahedra. There is two shorter (1.51 Å) and two longer (1.62 Å) P–O bond length. There are six inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted bent 120 degrees geometry to two P5+ atoms. In the second O2- site, O2- is bonded in a distorted bent 150 degrees geometry to one Sn2+ and one P5+ atom. In the third O2- site, O2- is bonded in a distorted single-bond geometry to one Sn2+ and one P5+ atom. In the fourth O2- site, O2- is bonded in a distorted single-bond geometry to one Sn2+ and one P5+ atom. In the fifth O2- site, O2- is bonded in a bent 120 degrees geometry to two P5+ atoms. In the sixth O2- site, O2- is bonded in a 2-coordinate geometry to one Sn2+ and one P5+ atom.

36 MATERIALS SCIENCE↗

DOE OSTI2020

Materials Data on Sn(PO3)2 by Materials Project

SnOP2O5 crystallizes in the orthorhombic C222_1 space group. The structure is three-dimensional. Sn2+ is bonded to four O2- atoms to form SnO4 tetrahedra that share corners with four PO4 tetrahedra. There are a spread of Sn–O bond distances ranging from 2.29–2.40 Å. There are three inequivalent P5+ sites. In the first P5+ site, P5+ is bonded to four O2- atoms to form PO4 tetrahedra that share corners with two equivalent SnO4 tetrahedra and corners with two PO4 tetrahedra. There are a spread of P–O bond distances ranging from 1.50–1.62 Å. In the second P5+ site, P5+ is bonded to four O2- atoms to form PO4 tetrahedra that share corners with two equivalent SnO4 tetrahedra and corners with two equivalent PO4 tetrahedra. There is two shorter (1.50 Å) and two longer (1.61 Å) P–O bond length. In the third P5+ site, P5+ is bonded to four O2- atoms to form PO4 tetrahedra that share corners with two equivalent SnO4 tetrahedra and corners with two equivalent PO4 tetrahedra. There is two shorter (1.50 Å) and two longer (1.63 Å) P–O bond length. There are six inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted bent 150 degrees geometry to one Sn2+ and one P5+ atom. In the second O2- site, O2- is bonded in a distorted bent 150 degrees geometry to one Sn2+ and one P5+ atom. In the third O2- site, O2- is bonded in a bent 150 degrees geometry to two P5+ atoms. In the fourth O2- site, O2- is bonded in a 2-coordinate geometry to one Sn2+ and one P5+ atom. In the fifth O2- site, O2- is bonded in a distorted bent 150 degrees geometry to two P5+ atoms. In the sixth O2- site, O2- is bonded in a distorted bent 120 degrees geometry to one Sn2+ and one P5+ atom.

36 MATERIALS SCIENCE↗

DOE OSTI2020

Materials Data on Sn(PO3)2 by Materials Project

SnOP2O5 crystallizes in the monoclinic P2_1/c space group. The structure is three-dimensional. Sn2+ is bonded to four O2- atoms to form SnO4 tetrahedra that share corners with four PO4 tetrahedra. There are a spread of Sn–O bond distances ranging from 2.26–2.47 Å. There are two inequivalent P5+ sites. In the first P5+ site, P5+ is bonded to four O2- atoms to form PO4 tetrahedra that share corners with two equivalent SnO4 tetrahedra and corners with two equivalent PO4 tetrahedra. There are a spread of P–O bond distances ranging from 1.51–1.62 Å. In the second P5+ site, P5+ is bonded to four O2- atoms to form PO4 tetrahedra that share corners with two equivalent SnO4 tetrahedra and corners with two equivalent PO4 tetrahedra. There is two shorter (1.50 Å) and two longer (1.63 Å) P–O bond length. There are six inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted bent 150 degrees geometry to one Sn2+ and one P5+ atom. In the second O2- site, O2- is bonded in a bent 120 degrees geometry to two P5+ atoms. In the third O2- site, O2- is bonded in a 1-coordinate geometry to one Sn2+ and one P5+ atom. In the fourth O2- site, O2- is bonded in a distorted single-bond geometry to one Sn2+ and one P5+ atom. In the fifth O2- site, O2- is bonded in a distorted bent 120 degrees geometry to one Sn2+ and one P5+ atom. In the sixth O2- site, O2- is bonded in a bent 150 degrees geometry to two P5+ atoms.

36 MATERIALS SCIENCE↗

DOE OSTI2020

Materials Data on Sn(S4I)4 by Materials Project

Sn(S)16(I)4 crystallizes in the orthorhombic Fdd2 space group. The structure is zero-dimensional and consists of eight 7440-31-5 molecules, thirty-two hydriodic acid molecules, and eight S clusters. In each S cluster, there are eight inequivalent S+1.50- sites. In the first S+1.50- site, S+1.50- is bonded in a distorted water-like geometry to two S+1.50- atoms. There are one shorter (2.12 Å) and one longer (2.19 Å) S–S bond lengths. In the second S+1.50- site, S+1.50- is bonded in a distorted water-like geometry to two S+1.50- atoms. There are one shorter (1.93 Å) and one longer (2.39 Å) S–S bond lengths. In the third S+1.50- site, S+1.50- is bonded in a bent 120 degrees geometry to two S+1.50- atoms. There are one shorter (1.99 Å) and one longer (2.23 Å) S–S bond lengths. In the fourth S+1.50- site, S+1.50- is bonded in a 2-coordinate geometry to two S+1.50- atoms. The S–S bond length is 1.93 Å. In the fifth S+1.50- site, S+1.50- is bonded in a distorted water-like geometry to two S+1.50- atoms. The S–S bond length is 1.94 Å. In the sixth S+1.50- site, S+1.50- is bonded in a water-like geometry to two S+1.50- atoms. In the seventh S+1.50- site, S+1.50- is bonded in a distorted bent 120 degrees geometry to two S+1.50- atoms. In the eighth S+1.50- site, S+1.50- is bonded in a single-bond geometry to one S+1.50- atom.

36 MATERIALS SCIENCE↗