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DOE OSTI2020

Materials Data on TeSe by Materials Project

TeSe crystallizes in the triclinic P1 space group. The structure is zero-dimensional and consists of one TeSe cluster. there are three inequivalent Te sites. In the first Te site, Te is bonded in a distorted single-bond geometry to one Se atom. The Te–Se bond length is 2.67 Å. In the second Te site, Te is bonded in a distorted single-bond geometry to one Se atom. The Te–Se bond length is 2.65 Å. In the third Te site, Te is bonded in a water-like geometry to two Se atoms. There are one shorter (2.62 Å) and one longer (2.64 Å) Te–Se bond lengths. There are three inequivalent Se sites. In the first Se site, Se is bonded in a distorted water-like geometry to one Te and one Se atom. The Se–Se bond length is 2.45 Å. In the second Se site, Se is bonded in a water-like geometry to two Te atoms. In the third Se site, Se is bonded in a distorted water-like geometry to one Te and one Se atom.

36 MATERIALS SCIENCE↗

DOE OSTI2020

Materials Data on Ti3(TeSe)2 by Materials Project

Ti3(TeSe)2 crystallizes in the monoclinic C2/m space group. The structure is three-dimensional. there are two inequivalent Ti+2.67+ sites. In the first Ti+2.67+ site, Ti+2.67+ is bonded to three equivalent Te2- and three equivalent Se2- atoms to form distorted TiTe3Se3 octahedra that share corners with six equivalent TiTe4Se2 octahedra, edges with six equivalent TiTe3Se3 octahedra, and a faceface with one TiTe4Se2 octahedra. The corner-sharing octahedra tilt angles range from 47–63°. There are two shorter (2.87 Å) and one longer (3.01 Å) Ti–Te bond lengths. There are one shorter (2.53 Å) and two longer (2.57 Å) Ti–Se bond lengths. In the second Ti+2.67+ site, Ti+2.67+ is bonded to four equivalent Te2- and two equivalent Se2- atoms to form TiTe4Se2 octahedra that share corners with twelve equivalent TiTe3Se3 octahedra, edges with two equivalent TiTe4Se2 octahedra, and faces with two equivalent TiTe3Se3 octahedra. The corner-sharing octahedra tilt angles range from 47–63°. All Ti–Te bond lengths are 2.80 Å. Both Ti–Se bond lengths are 2.58 Å. Te2- is bonded in a 5-coordinate geometry to five Ti+2.67+ atoms. Se2- is bonded in a 4-coordinate geometry to four Ti+2.67+ atoms.

36 MATERIALS SCIENCE↗

DOE OSTI2022

Electronic and structural properties of RbCe X 2 ( X 2 : O 2 , S 2 , SeS, Se 2 , TeSe, Te 2 )

We report triangular lattice delafossite compounds built from magnetic lanthanide ions are a topic of recent interest due to their frustrated magnetism and realization of quantum disordered magnetic ground states. Here we report the evolution of the structure and electronic ground states of RbCeX 2 compounds, built from a triangular lattice of Ce 3+ ions, upon varying their anion character (X 2 =O 2 , S 2 , SeS, Se 2 , TeSe, Te 2 ). This includes the discovery of a new member of this series, RbCeO 2 , that potentially realizes a quantum disordered ground state analogous to NaYbO 2 . Magnetization and susceptibility measurements reveal that all compounds manifest mean-field antiferromagnetic interactions and, with the exception of the oxide, possess signatures of magnetic correlations onset below 1 K. The crystalline electric field level scheme is explored via neutron scattering and ab initio calculations in order to model the intramultiplet splitting of the J=5/2 multiplet. In addition to the two excited doublets expected within the J=5/2 manifold, we observe one extra local mode present across the sample series. This added mode shifts downward in energy with increasing anion mass and decreasing crystal field strength, suggesting a long-lived anomalous mode endemic to anion motion about the Ce3 + sites.

71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSIC↗

DOE OSTI2022

The Simons Observatory: Magnetic Shielding Measurements for the Universal Multiplexing Module

The Simons Observatory (SO) includes four telescopes that will measure the temperature and polarization of the cosmic microwave background using over 60,000 highly sensitive transition-edge bolometers (TES). These multichroic TES bolometers are read out by a microwave RF SQUID multiplexing system with a multiplexing factor of 910. Given that both TESes and SQUIDs are susceptible to magnetic field pickup and that it is hard to predict how they will respond to such fields, it is important to characterize the magnetic response of these systems empirically. This information can then be used to limit spurious signals by informing magnetic shielding designs for the detectors and readout. This paper focuses on measurements of magnetic pickup with different magnetic shielding configurations for the SO universal multiplexing module (UMM), which contains the SQUIDs, associated resonators, and TES bias circuit. The magnetic pickup of a prototype UMM was tested under three shielding configurations: no shielding (copper packaging), aluminum packaging for the UMM, and a tin/lead-plated shield surrounding the entire dilution refrigerator 100 mK cold stage. We also present measurements of the pickup in the UMM when aluminum feedhorns are installed. The measurements show that the aluminum packaging outperforms the copper packaging by a shielding factor of 8-10, and adding the tin/lead-plated 1K shield further increases the relative shielding factor in the aluminum configuration by 1-2 orders of magnitude. Furthermore, the addition of feedhorns provides a factor of 30 improvement when the tin/lead shield is not installed and a factor of 5 improvement when it is.

71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSIC↗