Bulk ferromagnetism in cleavable van der Waals telluride NbFeTe.

A van der Waals telluride, NbFeTe, has been synthesized using chemical vapor transport reactions. The optimized synthetic conditions yield high-quality single crystals with a novel monoclinic crystal structure. Monoclinic NbFeTe demonstrates a (100) cleavage plane, bulk ferromagnetism below 87 K, and a metallic ground state-the necessary prerequisites for needed spintronics technologies.

Understanding Complex Interplay among Different Instabilities in Multiferroic BiMnO Using Fe Probe Mössbauer Spectroscopy.

Here, we report the results of a Mössbauer study on hyperfine electrical and magnetic interactions in quadruple perovskite BiMnO doped with Fe probes. Measurements were performed in the temperature range of 10 K < < 670 K, wherein BiMnFeO undergoes a cascade of structural ( ≈ 590 K, ≈ 442 K, and ≈ 240 K) and magnetic ( ≈ 57 K, ≈ 50 K, and ≈ 24 K) phase transitions. The analysis of the electric field gradient (EFG) parameters, including the dipole contribution from Bi ions, confirmed the presence of the local dipole moments , which are randomly oriented in the paraelectric cubic phase ( > ).

Layered van der Waals Chalcogenides FeAlSe, MnAlS, and MnAlSe: Atomically Thin Triangular Arrangement of Transition-Metal Atoms.

Layered van der Waals (vdW) chalcogenides of 3d transition metals are a rich source of two-dimensional (2D) nanomaterials, in which atomically thin layers with the terminating chalcogen atoms exhibit promising functionality for novel spintronic devices. Here, we report on the synthesis, crystal growth, and magnetic properties of FeAlSe, MnAlS, and MnAlSe ternary chalcogenides. Crystal structures are probed by powder X-ray diffraction, Mössbauer spectroscopy, and high-resolution transmission electron microscopy.

Controlled Reduction of Sn in the Complex Iodide CsSnI with Metallic Gallium.

Metal gallium as a low-melting solid was applied in a mixture with elemental iodine to substitute tin(IV) in a promising light-harvesting phase of CsSnI by a reactive sintering method. The reducing power of gallium was applied to influence the optoelectronic properties of the CsSnI phase via partial reduction of tin(IV) and, very likely, substitute partially Sn by Ga. The reduction of Sn to Sn in the CsSnI phase contributes to the switching from -type conductivity to n-type, thereby improving the total concentration and mobility of negative-charge carriers.

Correction: High-coercivity hexaferrite ceramics featuring sub-terahertz ferromagnetic resonance.

Correction for 'High-coercivity hexaferrite ceramics featuring sub-terahertz ferromagnetic resonance' by Evgeny A. Gorbachev , , 2022, , 1264-1272, DOI: https://doi.org/10.

High-coercivity hexaferrite ceramics featuring sub-terahertz ferromagnetic resonance.

Herein, we demonstrate for the first time compact ferrite ceramics with giant coercivity. The materials are manufactured sintering single-domain SrCaFeAlO particles synthesized by a citrate-nitrate auto-combustion method. The obtained ceramics show coercivities up to 22.

Endohedral Cluster Superconductors in the Mo-Ga-Sn System Explored by the Joint Flux Technique.

Endohedral Ga cluster compounds feature nontrivial superconducting states including the two-gap superconductivity similar in nature to MgB. We use the joint flux synthetic technique to introduce Sn into the Ga matrix and tune the valence electron count in the two new endohedral cluster superconductors MoGaSn and MoGaSn with critical temperatures of = 8.7 and 5.

The Role of Semilabile Oxygen Atoms for Intercalation Chemistry of the Metal-Ion Battery Polyanion Cathodes.

Using the orthorhombic layered NaFePOF cathode material as a model system we identify the bonding of the alkali metal cations to the semilabile oxygen atoms as an important factor affecting electrochemical activity of alkali cations in polyanion structures. The semilabile oxygens, bonded to the P and alkali cations, but not included into the FeOF octahedra, experience severe undercoordination upon alkali cation deintercalation, causing an energy penalty for removing the alkali cations located in the proximity of such semilabile oxygens. Desodiation of NaFePOF proceeds through a two-phase mechanism in the Na-ion cell with a formation of an intermediate monoclinic NaFePOF phase with coupled Na/vacancy and Fe/Fe charge ordering at 50% state of charge.

Effect of Transition Metal Substitution on the Structure and Properties of a Clathrate-Like Compound Eu₇CuAs.

A series of substitutional solid solutions-Eu₇CuTAs (T = Fe, Co, Ni)-based on a recently discovered clathrate-like compound (Eu₇CuAs) were synthesized from the elements at 800 °C. Almost up to 50% of Cu can be substituted by Ni, resulting in a linear decrease of the cubic unit cell parameter from = 16.6707(1) Å for the ternary compound to = 16.

New Fe-based layered telluride FeAsTe: synthesis, crystal structure and physical properties.

A new ternary telluride, FeAsTe, was synthesized from elements at 600 °C. It crystallizes in the hexagonal P6/mmc space group with the unit cell parameters a = 3.85091(9) Å and c = 17.

Spin-Driven Multiferroic Properties of PbMn7O12 Perovskite.

We synthesize PbMn7O12 perovskite under high-pressure (6 GPa) and high-temperature (1373 K) conditions and investigate its structural, magnetic, dielectric, and ferroelectric properties. We find that PbMn7O12 exhibits rich physical properties from interplay among charge, orbital, and spin degrees of freedom and rich structural properties. PbMn7O12 crystallizes in space group R3̅ near room temperature and shows a structural phase transition at TCO = 397 K to a cubic structure in space group Im3̅; the Im3̅-to-R3̅ transition is associated with charge ordering.

High-pressure synthesis, crystal structures, and properties of CdMn7O12 and SrMn7O12 perovskites.

We synthesize CdMn7O12 and SrMn7-xFexO12 (x = 0, 0.08, and 0.5) perovskites under high pressure (6 GPa) and high temperature (1373-1573 K) conditions and investigate their structural, magnetic, dielectric, and ferroelectric properties.

Sc2NiMnO6: A Double-Perovskite with a Magnetodielectric Response Driven by Multiple Magnetic Orders.

Perovskite materials provide a large variety of interesting physical properties and applications. Here, we report on unique properties of a fully ordered magnetodielectric double-perovskite, Sc2NiMnO6 (space group P21/n, a = 4.99860 Å, b = 5.

Structure and cation distribution in perovskites with small cations at the A site: the case of ScCoO.

We synthesize ScCoO perovskite and its solid solutions, ScCo Fe O and ScCo Cr O, under high pressure (6 GPa) and high temperature (1570 K) conditions. We find noticeable shifts from the stoichiometric compositions, expressed as (Sc )O with = 0.05-0.

High-pressure synthesis, crystal structure and magnetic properties of TlCrO3 perovskite.

TlMO(3) perovskites (M(3+) = transition metals) are exceptional members of trivalent perovskite families because of the strong covalency of Tl(3+)-O bonds. Here we report on the synthesis, crystal structure and properties of TlCrO(3) investigated by Mössbauer spectroscopy, specific heat, dc/ac magnetization and dielectric measurements. TlCrO(3) perovskite is prepared under high pressure (6 GPa) and high temperature (1500 K) conditions.

Perovskite-structure TlMnO₃: a new manganite with new properties.

We synthesize a new member of the AMnO3 perovskite manganite family (where A is a trivalent cation)--thallium manganite, TlMnO3--under high-pressure (6 GPa) and high-temperature (1500 K) conditions and show that the structural and magnetic properties are distinct from those of all other AMnO3 manganites. The crystal structure of TlMnO3 is solved and refined using single-crystal X-ray diffraction data. We obtain a triclinically distorted structure with space group P1̅ (No.