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Updates from across the NSF MIP community.

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Figure 1: a-d) TMD Moiré system, crystalline (b), two types of nematic (c) and the intermediate phases (d). e-g) Electronic liquid crystalline phase (f) in between two electronic crystal phases (e and g).
Highlight · Nov 19, 2022
Cornell University

The Electronic Phase Diagram of Moiré Superlattices

Eun-Ah Kim (Cornell University)
Members of PARADIM’s in-house research team have used Monte Carlo simulations to study intermediate phases occurring at fractional electron counts between the charge-ordered states in the strong coupling limit. The team found two distinct stripe solid states to be each preceded by distinct types of nematic states and describes a microscopic mechanism that stabilizes each of the nematic states.
A) 5,10,15,20-Tetraphenyl-21H,23H-porphine cobalt(II); B) thermal ellipsoid plot of molecule (A) with all but H atoms labeled; C) measured refined structure of molecule (A) and measured electron density on top.
Highlight · Nov 18, 2022
University of California, Santa Barbara

New first-of-its-kind Electron Diffraction Tomography (MicroED) microscope available at BioPACIFIC MIP facilities

BioPACIFIC MIP at UCLA
The BioPACIFIC MIP team has completed the construction and installation of a state-of-the-art transmission electron microscope (TEM) and has made the instrument available to users.
Courtesy of BioPacific News
News · Nov 18, 2022
University of California, Santa Barbara

BioPACIFIC MIP has signed off on the state of the art microED

UCLA has introduced a shared-use electron microscope, the ThermoFisher Scientific Spectra 300C, for studying atomic structures of bio-sourced compounds. This tool enables rapid structure determination through micro-electron diffraction, significantly reducing analysis time. It supports the BioPACIFIC MIP collaboration aimed at developing sustainable bio-based materials, benefiting researchers at UCLA, UCSB, and beyond.
MicroED at BioPACIFIC MIP now online!
News · Nov 18, 2022

BioPACIFIC MIP has signed off on the state of the art microED

There’s a new shared-use electron microscope at UCLA for investigators seeking to elucidate the atomic structures of bio-sourced monomers and small molecules. The NSF’s BioPACIFIC MIP now offers access to its ThermoFisher Scientific Spectra 300C transmission electron microscope (TEM) housed at the California NanoSystems Institute at UCLA.
Figure 1: Cover of the November/December 2022 issue of the Journal of Vacuum Science and Technology A that features the newly discovered phases and the electron micrographs of the epitaxially grown samples realized at PARADIM.
Highlight · Nov 14, 2022
Cornell University

From Machine Learning to Discovery of New Family Member

Lena F. Kourkoutis and Darrell G. Schlom (Cornell University)
Thin films of Ba3In2O6 had never been made and PARADIM researchers were able to grow the desired phase using a new variant of molecular-beam epitaxy (MBE), suboxide MBE, developed in PARADIM. In addition to succeeding in the growth of the targeted phase, Ba3In2O6, PARADIM researchers also discovered a new barium indate phase with an even simpler crystal structure, Ba4In2O7, that is analogous to the first high-temperature cuprate superconductor discovered, (La,Ba)2CuO4.
Berit Goodge. Image courtesy of PARADIM.
News · Nov 1, 2022
Cornell University

PARADIM Researcher Berit Goodge Awarded Third Prize in APL Materials Excellence in Research Award

By PARADIM News

Berit Goodge received third prize in the APL Materials Excellence in Research Award for her study on lattice disorder's impact on superconductivity in Sr₂RuO₄.

Figure 1: a, The 4D-LSTEM setup. The deflection angle (black-dashed lines) caused by the lateral magnetic induction field (B) in the sample via the Lorentz force is measured by a 2D pixel array detector, such as an EMPAD. b, Measured magnetic phase shift of a skyrmion lattice in FeGe reconstructed from LEP using a 4D-LSTEM dataset. Out-of-plane component of B goes inwards (labelled as a circle with a cross). c, Lateral magnetic field map calculated via the first-order gradient of the phase recorded in b. The color shows the direction, and the brightness shows the magnitude, as given by the color wheel in the lower left inset in c. d, Magnetic-field vector map from the enlarged region marked by a white box in c. The arrows represent the magnetic field vectors with the length representing the lateral magnetic field magnitude. The false color shows only the magnetization direction. The dataset was acquired at a temperature of 94 K with an external magnetic field of 130 mT pointing into the page. Scale bars, 50 nm.
Highlight · Oct 31, 2022
Cornell University

Lorentz Ptychography for high-resolution, high sensitivity magnetic imaging

David A. Muller (Cornell University)
The study establishes a quantitative, high-resolution magnetic microscopy technique that can reveal nanoscale spin textures, especially magnetization discontinuities and topological defects in nanomagnets. The technique’s high-dose efficiency should also make it well suited for the exploration of magnetic textures in electron radiation-sensitive materials such as organic or molecular magnets.
(a) Chemical structure and the MALDI spectrum of DMG-PEG2000 and (b) the chemical structure and MALDI spectrum of discrete PEG oligomers
Highlight · Oct 14, 2022
University of California, Santa Barbara

Discrete Libraries of Amphiphilic Poly(ethylene glycol) Graft Copolymers: Synthesis, Assembly, and Bioactivity

Junfeng Chen, Aoon Rizvi, Joseph P. Patterson, and Craig J. Hawker (UCSB and UCI)
Demonstration of a novel strategy for the scalable synthesis of multiple libraries of discrete lipid poly(ethylene glycol) (DMG-PEG) derivatives, with precise control over the structure and molecular weight.
Comparison of SAXS data between BioPACIFIC MIP and SLAC
Highlight · Oct 3, 2022
University of California, Santa Barbara

Efficient Creation and Morphological Analysis of ABC Triblock Terpolymer Libraries

Craig Hawker and Christopher Bates (UCSB)
A versatile and scalable strategy to separate parent triblock terpolymers into libraries of fractionated samples spanning a wide range of compositions was developed.
Lena Kourkoutis. Image courtesy of PARADIM.
News · Oct 1, 2022
Cornell University

Lena Kourkoutis Named 2022 APS Fellow for Advances in Electron Microscopy

By PARADIM News

Lena Kourkoutis was elected a 2022 Fellow of the American Physical Society for her groundbreaking work in cryogenic scanning transmission electron microscopy.

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