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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on Sr3Ru2O7 by Materials Project

Sr3Ru2O7 crystallizes in the orthorhombic Ccce space group. The structure is three-dimensional. there are two inequivalent Sr2+ sites. In the first Sr2+ site, Sr2+ is bonded in a 9-coordinate geometry to nine O2- atoms. There are a spread of Sr–O bond distances ranging from 2.47–2.93 Å. In the second Sr2+ site, Sr2+ is bonded to twelve O2- atoms to form distorted SrO12 cuboctahedra that share corners with four equivalent SrO12 cuboctahedra, faces with four equivalent SrO12 cuboctahedra, and faces with eight equivalent RuO6 octahedra. There are a spread of Sr–O bond distances ranging from 2.62–3.03 Å. Ru4+ is bonded to six O2- atoms to form RuO6 octahedra that share corners with five equivalent RuO6 octahedra and faces with four equivalent SrO12 cuboctahedra. The corner-sharing octahedra tilt angles range from 0–17°. There are four shorter (2.00 Å) and two longer (2.03 Å) Ru–O bond lengths. There are three inequivalent O2- sites. In the first O2- site, O2- is bonded in a 6-coordinate geometry to four Sr2+ and two equivalent Ru4+ atoms. In the second O2- site, O2- is bonded to five equivalent Sr2+ and one Ru4+ atom to form a mixture of distorted edge and corner-sharing OSr5Ru octahedra. The corner-sharing octahedra tilt angles range from 0–8°. In the third O2- site, O2- is bonded to four equivalent Sr2+ and two equivalent Ru4+ atoms to form distorted OSr4Ru2 octahedra that share corners with six OSr5Ru octahedra and edges with four equivalent OSr4Ru2 octahedra. The corner-sharing octahedral tilt angles are 0°.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Sr3Ru2O7 by Materials Project

Sr3Ru2O7 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. there are two inequivalent Sr2+ sites. In the first Sr2+ site, Sr2+ is bonded to twelve O2- atoms to form SrO12 cuboctahedra that share corners with four equivalent SrO12 cuboctahedra, faces with four equivalent SrO12 cuboctahedra, and faces with eight equivalent RuO6 octahedra. There are eight shorter (2.81 Å) and four longer (2.82 Å) Sr–O bond lengths. In the second Sr2+ site, Sr2+ is bonded in a 9-coordinate geometry to nine O2- atoms. There are a spread of Sr–O bond distances ranging from 2.46–2.84 Å. Ru4+ is bonded to six O2- atoms to form RuO6 octahedra that share corners with five equivalent RuO6 octahedra and faces with four equivalent SrO12 cuboctahedra. The corner-sharing octahedra tilt angles range from 0–2°. There are four shorter (2.00 Å) and two longer (2.01 Å) Ru–O bond lengths. There are three inequivalent O2- sites. In the first O2- site, O2- is bonded to four Sr2+ and two equivalent Ru4+ atoms to form a mixture of distorted corner, edge, and face-sharing OSr4Ru2 octahedra. The corner-sharing octahedra tilt angles range from 0–60°. In the second O2- site, O2- is bonded to five equivalent Sr2+ and one Ru4+ atom to form distorted OSr5Ru octahedra that share corners with seventeen OSr4Ru2 octahedra, edges with eight equivalent OSr5Ru octahedra, and faces with four equivalent OSr4Ru2 octahedra. The corner-sharing octahedra tilt angles range from 0–54°. In the third O2- site, O2- is bonded to four equivalent Sr2+ and two equivalent Ru4+ atoms to form a mixture of distorted corner, edge, and face-sharing OSr4Ru2 octahedra. The corner-sharing octahedra tilt angles range from 0–60°.

36 MATERIALS SCIENCE↗
DOE OSTI2025

Layer-dependent spin-resolved electronic structure of ferromagnetic triple-layered ruthenate Sr4Ru3O10

High-resolution angle- and spin-resolved photoemission spectroscopy (ARPES) of the triple-layered ruthenate Sr4Ru3O10 reveals features of the electronic structure that extend our understanding of the layered strontium ruthenates. The spectra near the Fermi energy are very different from the nonmagnetic analogues Sr2RuO4 and Sr3Ru2O7 with distinct Fermi surfaces for wide electronlike minority spin bands around the zone center and narrow holelike majority spin Fermi surface contours around the zone corners. The most dramatic results are two narrow spectral peaks ∼30 meV below the Fermi level, a spin-minority holelike band at the Brillouin zone center, and a spin-majority saddle-band van Hove singularity at the zone edge, which exhibits almost 100% spin polarization at low temperature, and a strong temperature dependent coherence-incoherence crossover attributed to Hund metal correlations. Quantitative comparison of the ARPES to spin-polarized density functional theory (DFT) calculations identify the specific antibonding and nonbonding orbital origins of the narrow bands, with a prediction of different spatial localization in the central and outer layers. This is shown to be consistent with experimental ARPES multizone matrix element intensity variations, and implicates outer-layer-specific control of the in-plane metamagnetism. The renormalization of the bands relative to the mean-field DFT, the demonstration of spin-polarized oxygen bands, and of spin-minority and spin-majority band-crossing hybridization provide a more complete picture of the magnetism which displays aspects of both delocalized and local moment behavior.

75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND↗