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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on UGe2 by Materials Project

UGe2 is Zirconium Disilicide-like structured and crystallizes in the orthorhombic Cmmm space group. The structure is three-dimensional. U is bonded in a 10-coordinate geometry to ten Ge atoms. There are a spread of U–Ge bond distances ranging from 2.92–3.20 Å. There are three inequivalent Ge sites. In the first Ge site, Ge is bonded in a distorted square co-planar geometry to four equivalent U and four equivalent Ge atoms. All Ge–Ge bond lengths are 2.93 Å. In the second Ge site, Ge is bonded in a distorted square co-planar geometry to four equivalent U and four equivalent Ge atoms. In the third Ge site, Ge is bonded in a 8-coordinate geometry to six equivalent U and two equivalent Ge atoms. Both Ge–Ge bond lengths are 2.77 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on UGe2 by Materials Project

UGe2 is Zirconium Disilicide structured and crystallizes in the orthorhombic Cmcm space group. The structure is three-dimensional. U is bonded in a 10-coordinate geometry to ten Ge atoms. There are a spread of U–Ge bond distances ranging from 2.95–3.19 Å. There are two inequivalent Ge sites. In the first Ge site, Ge is bonded in a 8-coordinate geometry to six equivalent U and two equivalent Ge atoms. Both Ge–Ge bond lengths are 2.70 Å. In the second Ge site, Ge is bonded in a 8-coordinate geometry to four equivalent U and four equivalent Ge atoms. All Ge–Ge bond lengths are 2.89 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Zr3(UGe2)2 by Materials Project

U2Zr3Ge4 crystallizes in the monoclinic P2_1/c space group. The structure is three-dimensional. U is bonded in a 7-coordinate geometry to seven Ge atoms. There are a spread of U–Ge bond distances ranging from 2.91–3.22 Å. There are two inequivalent Zr sites. In the first Zr site, Zr is bonded in a 6-coordinate geometry to six Ge atoms. There are a spread of Zr–Ge bond distances ranging from 2.72–2.87 Å. In the second Zr site, Zr is bonded to six Ge atoms to form corner-sharing ZrGe6 octahedra. The corner-sharing octahedral tilt angles are 50°. There are a spread of Zr–Ge bond distances ranging from 2.84–2.92 Å. There are two inequivalent Ge sites. In the first Ge site, Ge is bonded in a 9-coordinate geometry to four equivalent U, four Zr, and one Ge atom. The Ge–Ge bond length is 2.82 Å. In the second Ge site, Ge is bonded in a 9-coordinate geometry to three equivalent U, five Zr, and one Ge atom. The Ge–Ge bond length is 2.77 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Incommensurate Spin Fluctuations in the Spin-Triplet Superconductor Candidate UTe 2

Spin-triplet superconductors are of extensive current interest because they can host topological state and Majorana fermions important for quantum computation. The uranium-based heavy-fermion superconductor UTe 2 has been argued as a spin-triplet superconductor similar to UGe2, URhGe, and UCoGe, where the superconducting phase is near (or coexists with) a ferromagnetic (FM) instability and spin-triplet electron pairing is driven by FM spin fluctuations. Here we use neutron scattering to show that, although UTe 2 exhibits no static magnetic order down to 0.3 K, its magnetism in the [0,K,L] plane is dominated by incommensurate spin fluctuations near an antiferromagnetic ordering wave vector and extends to at least 2.6 meV. We are able to understand the dominant incommensurate spin fluctuations of UTe 2 in terms of its electronic structure calculated using a combined density-functional and dynamic mean-field theory.

75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND↗