Magnetism and Thermoelectric Properties of the Zintl Semiconductor: EuZnAs.

Compositional diversity and intriguing structural features have made Zintl phases excellent candidates as thermoelectric materials. Zintl phase with 21-4-18 composition has shown high thermoelectric performance in the mid- to high-temperature ranges. The complex crystal structure and favorable transport properties of these compounds indicate the potential for high thermoelectric efficiency.

β-Phase YbSbH: Magnetic and Thermoelectric Properties Traversing from an Electride to a Semiconductor.

An electride is a compound that contains a localized electron in an empty crystallographic site. This class of materials has a wide range of applications, including superconductivity, batteries, photonics, and catalysis. Both polymorphs of YbSb (the orthorhombic CaSbF structure type (β phase) and hexagonal MnSi structure type (α phase)) are known to be electrides with electrons localized in 0D tetrahedral cavities and 1D octahedral chains, respectively.

Thermoelectric Properties of BaEuZnSb, a Zintl Phase with One-Dimensional Covalent Chains.

The compound BaZnSb has been predicted to be a promising thermoelectric material, potentially achieving > 2 at 900 K due to its one-dimensional chains of edge-shared [ZnSb] tetrahedra and interspersed Ba cations. However, the high air sensitivity of this material makes it difficult to measure its thermoelectric properties. In this work, isovalent substitution of Eu for Ba was carried out to make BaEuZnSb in order to improve the stability of the material in air and to allow characterization of thermal and electronic properties of three different compositions ( = 0.

A rule-free workflow for the automated generation of databases from scientific literature.

In recent times, transformer networks have achieved state-of-the-art performance in a wide range of natural language processing tasks. Here we present a workflow based on the fine-tuning of BERT models for different downstream tasks, which results in the automated extraction of structured information from unstructured natural language in scientific literature. Contrary to existing methods for the automated extraction of structured compound-property relations from similar sources, our workflow does not rely on the definition of intricate grammar rules.

Anomalous depinning of magnetic domain walls within the ferromagnetic phase of the Weyl semimetal CoSnS.

We report bulk magnetization measurements and spatially resolved measurements of magnetic domains inCo3Sn2S2single crystals. The results indicate that a previously reported magnetic anomaly around 130 K is due to an anomalous domain wall depinning upon cooling. Our measurements also reveal a hysteresis between field-cooled-cooling and field-cooled-warming magnetization curves acquired under a constant magnetic field below 300 Oe.

Deconvoluting the Magnetic Structure of the Commensurately Modulated Quinary Zintl Phase EuSrZnSnAs.

The structure, magnetic properties, and Eu and Sn Mössbauer spectra of the solid-solution EuSrZnSnAs are presented. A new commensurately modulated structure is described for EuZnSnAs (3 space group, average structure) that closely resembles the original structural description in the monoclinic 2/ space group with layers of Eu, puckered hexagonal ZnAs sheets, and ZnAs ethane-like isolated pillars. The solid-solution EuSrZnSnAs (0 < < 10) is found to crystallize in the commensurately modulated 3 space group, related to the parent phase but lacking the mirror symmetry.

Magnetic properties of γ-FeOnanoparticles in a porous SiOshell for drug delivery.

A method is presented for synthesizing core-shell nanoparticles with a magnetic core and a porous shell suitable for drug delivery and other medical applications. The core contains multiple $\gamma$-Fe$_2$O$_3$ nanoparticles ($\sim$15~nm) enclosed in a SiO$_2$ ($\sim$100-200~nm) matrix using either methyl (denoted TMOS-$\gamma$-Fe$_2$O$_3$) or ethyl (TEOS-$\gamma$-Fe$_2$O$_3$) template groups. Low-temperature M{\"o}ssbauer spectroscopy showed that the magnetic nanoparticles have the maghemite structure, $\gamma$-Fe$_2$O$_3$, with all the vacancies in the octahedral sites.

Interfacial-Redox-Induced Tuning of Superconductivity in YBaCuO.

Solid-state ionic approaches for modifying ion distributions in getter/oxide heterostructures offer exciting potentials to control material properties. Here, we report a simple, scalable approach allowing for manipulation of the superconducting transition in optimally doped YBaCuO (YBCO) films via a chemically driven ionic migration mechanism. Using a thin Gd capping layer of up to 20 nm deposited onto 100 nm thick epitaxial YBCO films, oxygen is found to leach from deep within the YBCO.

Tricritical wings and modulated magnetic phases in LaCrGe under pressure.

Experimental and theoretical investigations on itinerant ferromagnetic systems under pressure have shown that ferromagnetic quantum criticality is avoided either by a change of the transition order, becoming of the first order at a tricritical point, or by the appearance of modulated magnetic phases. In the first case, the application of a magnetic field reveals a wing-structure phase diagram as seen in itinerant ferromagnets such as ZrZn and UGe. In the second case, no tricritical wings have been observed so far.

Polar Intermetallics Pr Co Ge and Pr Co Ge with Planar Hydrocarbon-Like Metal Clusters.

Planar hydrocarbon-like metal clusters may foster new insights linking organic molecules with conjugated π-π bonding interactions and inorganic structures in terms of their bonding characteristics. However, such clusters are uncommon in polar intermetallics. Herein, we report two polar intermetallic phases, Pr Co Ge and Pr Co Ge , both of which feature such planar metal clusters, namely, ethylene-like [Co Ge ] clusters plus the concatenated forms and polyacene-like [Co Ge ] ribbons in Pr Co Ge , and 1,2,4,5-tetramethylbenzene-like [Co Ge ] cluster in Pr Co Ge .

Ferromagnetic Quantum Critical Point Avoided by the Appearance of Another Magnetic Phase in LaCrGe_{3} under Pressure.

The temperature-pressure phase diagram of the ferromagnet LaCrGe_{3} is determined for the first time from a combination of magnetization, muon-spin-rotation, and electrical resistivity measurements. The ferromagnetic phase is suppressed near 2.1 GPa, but quantum criticality is avoided by the appearance of a magnetic phase, likely modulated, AFM_{Q}.