Time evolution of a pumped molecular magnet-A time-resolved inelastic neutron scattering study.

Introducing an experimental technique of time-resolved inelastic neutron scattering (TRINS), we explore the time-dependent effects of resonant pulsed microwaves on the molecular magnet CrFPiv. The octagonal rings of magnetic Cr atoms with antiferromagnetic interactions form a singlet ground state with a weakly split triplet of excitations at 0.8 meV.

Exceptional hardness in multiprincipal element alloys via hierarchical oxygen heterogeneities.

Refractory multiprincipal element alloys (RMPEAs) are potential successors to incumbent high-temperature structural alloys, although efforts to improve oxidation resistance with large additions of passivating elements have led to embrittlement. RMPEAs containing group IV and V elements have a balance of properties including moderate ductility, low density, and the necessary formability. We find that oxidation of group IV-V RMPEAs induces hierarchical heterogeneities, ranging from nanoscale interstitial complexes to tertiary phases.

Tolerance Factor Approach for the Design of Quaternary Materials as Applied to the ALnCuQ Homologous Series.

The design of novel quaternary materials can be a chemically challenging endeavor. Here, we show that a new tolerance factor, we herein call the quaternary tolerance factor (QTF), akin to the Goldschmidt ratio, can be applied to a homologous series of quaternary materials to aid in the prediction of structural stability in new phases. Single crystals of nine new members of the CuQ homologous series were synthesized ( = K, Rb, Cs, = Sm, Gd, Tb, Dy, Er, Yb, Lu, = S, Se) for = 1, 2, and 3 using a reactive KCl flux method as the sole potassium source.

Synthesis and Physical Properties of the Misfit Layered Compound (EuS)(NbSe).

A new misfit layered compound with the stoichiometry (EuS)(NbSe) (δ ≈ 0.13) has been successfully synthesized. High-resolution transmission electron microscopy and powder X-ray diffraction confirm the misfit structure with (EuS)-(EuS) spacing of 18.

Superconductivity-Electron Count Relationship in Heusler Phases-the Case of LiPdSi.

We report superconductivity in the full Heusler compound LiPdSi (space group , No. 225) at a critical temperature of = 1.3 K and a normalized heat capacity jump at , Δ/γ = 1.

The reverse quantum limit and its implications for unconventional quantum oscillations in YbB.

The quantum limit in a Fermi liquid, realized when a single Landau level is occupied in strong magnetic fields, gives rise to unconventional states, including the fractional quantum Hall effect and excitonic insulators. Stronger interactions in metals with nearly localized f-electron degrees of freedom increase the likelihood of these unconventional states. However, access to the quantum limit is typically impeded by the tendency of f-electrons to polarize in a strong magnetic field, consequently weakening the interactions.

Anisotropic proximity-induced superconductivity and edge supercurrent in Kagome metal, KVSb.

Materials with Kagome nets are of particular importance for their potential combination of strong correlation, exotic magnetism, and electronic topology. KVSb was discovered to be a layered topological metal with a Kagome net of vanadium. Here, we fabricated Josephson Junctions of KVSb and induced superconductivity over long junction lengths.

Influence of Magnetic and Electric Fields on Universal Conductance Fluctuations in Thin Films of the Dirac Semimetal CdAs.

Time-reversal invariance (TRS) and inversion symmetry (IS) are responsible for the topological band structure in Dirac semimetals (DSMs). These symmetries can be broken by applying an external magnetic or electric field, resulting in fundamental changes to the ground state Hamiltonian and a topological phase transition. We probe these changes using universal conductance fluctuations (UCF) in the prototypical DSM, CdAs.

Bonding and Suppression of a Magnetic Phase Transition in EuMnP.

Electrons in solids often adopt complex patterns of chemical bonding driven by the competition between energy gains from covalency and delocalization, and energy costs of double occupation to satisfy Pauli exclusion, with multiple intermediate states in the transition between highly localized, and magnetic, and delocalized, and nonmagnetic limits. Herein, we report a chemical pressure-driven transition from a proper Mn magnetic ordering phase transition to a Mn magnetic phase crossover in EuMnP the limiting end member of the EuMnX (X = Sb, As, P) family of layered materials. This loss of a magnetic ordering occurs despite EuMnP remaining an insulator at all temperatures, and with a phase transition to long-range Eu antiferromagnetic order at ≈ 17 K.

Targeting Unc51-like Autophagy Activating Kinase 1 (ULK1) Overcomes Adaptive Drug Resistance in Acute Myelogenous Leukemia.

Unlabelled: Despite effective new therapies, adaptive resistance remains the main obstacle in acute myelogenous leukemia (AML) therapy. Autophagy induction is a key mechanism for adaptive resistance. Leukemic blasts at diagnosis express higher levels of the apical autophagy kinase ULK1 compared with normal hematopoietic cells.

Highly Electron-Doped TaON Single-Crystal Growth by a High-Pressure Flux Method.

Transition-metal oxynitrides have a variety of functions such as visible light-responsive catalysts and dielectric materials, but acquiring single crystals necessary to understand inherent properties is difficult and is limited to relatively small sizes (<10 μm) because they easily decompose at high temperatures. Here, we have succeeded in growing platelet single crystals of TaON with a typical size of 50 × 100 × 10 μm under a high pressure and high temperature (6 GPa and 1400 °C) using a LiCl flux. Such a harsh condition, in contrast to powder samples synthesized under mild conditions, resulted in the introduction of a large amount of oxygen vacancies ( = 0.

The field-free Josephson diode in a van der Waals heterostructure.

The superconducting analogue to the semiconducting diode, the Josephson diode, has long been sought with multiple avenues to realization being proposed by theorists. Showing magnetic-field-free, single-directional superconductivity with Josephson coupling, it would serve as the building block for next-generation superconducting circuit technology. Here we realized the Josephson diode by fabricating an inversion symmetry breaking van der Waals heterostructure of NbSe/NbBr/NbSe.

Structural, Thermodynamic, and Transport Properties of the Small-Gap Two-Dimensional Metal-Organic Kagomé Materials Cu(hexaiminobenzene) and Ni(hexaiminobenzene).

Metal-organic frameworks (MOFs) provide exceptional chemical tunability and have recently been demonstrated to exhibit electrical conductivity and related functional electronic properties. The kagomé lattice is a fruitful source of novel physical states of matter, including the quantum spin liquid (in insulators) and Dirac fermions (in metals). Small-bandgap kagomé materials have the potential to bridge quantum spin liquid states and exhibit phenomena such as superconductivity but remain exceptionally rare.

The Role of Phonons and Oxygen Vacancies in Non-Cubic SrVO.

Combining neutron diffraction with pair distribution function analysis, we have uncovered hidden reduced symmetry in the correlated metallic perovskite, SrVO. Specifically, we show that both the local and global structures are better described using a GdFeO distorted (orthorhombic) model as opposed to the ideal cubic ABO perovskite type. Recent reports of imaginary phonon frequencies in the density functional theory (DFT)-calculated phonon dispersion for cubic SrVO suggest a possible origin of this observed non-cubicity.

A Gold(I) Oxide Double Perovskite: BaAuIO.

Oxide perovskites offer improved stability compared to halide perovskite compounds for optoelectronic applications. Here, we report the first gold-containing double perovskite, BaAuIO, and compare it to BaAgIO and BaNaIO. BaAuIO and BaAgIO exhibit a monoclinic distortion from the cubic perovskite structure possessed by BaNaIO and have similar lattice constants despite the nominally larger size of Au compared to Ag.

Twisting of 2D Kagomé Sheets in Layered Intermetallics.

Chemical bonding in 2D layered materials and van der Waals solids is central to understanding and harnessing their unique electronic, magnetic, optical, thermal, and superconducting properties. Here, we report the discovery of spontaneous, bidirectional, bilayer twisting (twist angle ∼4.5°) in the metallic kagomé MgCoGe at = 100(2) K via X-ray diffraction measurements, enabled by the preparation of single crystals by the Laser Bridgman method.

The effectiveness of telepsychology with veterans: A meta-analysis of services delivered by videoconference and phone.

Veterans face a variety of stressors due to their military service and are more likely to develop psychological problems as a result. Research suggests that as many as half of veterans with mental health conditions go untreated due to barriers including lack of accessibility to services and stigma. The present study builds on previous research by using meta-analytic techniques to determine the effectiveness of telepsychology-delivered therapy with veterans.

Competing antiferromagnetic-ferromagnetic states in a Kitaev honeycomb magnet.

The Kitaev model is a rare example of an analytically solvable and physically instantiable Hamiltonian yielding a topological quantum spin liquid ground state. Here we report signatures of Kitaev spin liquid physics in the honeycomb magnet LiCoSbO, built of high-spin (Co) ions, in contrast to the more typical low-spin electron configurations in the presence of large spin-orbit coupling. Neutron powder diffraction measurements, heat capacity, and magnetization studies support the development of a long-range antiferromagnetic order space group of , below at .

Discovery and Single Crystal Growth of High Entropy Pyrochlores.

A family of high entropy oxides with the formula MgTaLnO (Ln = La, Pr, Nd, Sm, Eu, Gd) has been discovered and synthesized. Single crystals, 5 mm OD × 2.5 cm, for Ln = Nd have been grown using the laser optical floating zone technique.

Chemistry of Quantum Spin Liquids.

Quantum spin liquids are an exciting playground for exotic physical phenomena and emergent many-body quantum states. The realization and discovery of quantum spin liquid candidate materials and associated phenomena lie at the intersection of solid-state chemistry, condensed matter physics, and materials science and engineering. In this review, we provide the current status of the crystal chemistry, synthetic techniques, physical properties, and research methods in the field of quantum spin liquids.

Giant, unconventional anomalous Hall effect in the metallic frustrated magnet candidate, KVSb.

The anomalous Hall effect (AHE) is one of the most fundamental phenomena in physics. In the highly conductive regime, ferromagnetic metals have been the focus of past research. Here, we report a giant extrinsic AHE in KVSb, an exfoliable, highly conductive semimetal with Dirac quasiparticles and a vanadium Kagome net.

Risky Behavior: Hospital Transfers Associated with Early Mortality and Rates of Goals of Care Discussions.

Introduction: Inter-hospital transfer (IHT) patients have higher in-hospital mortality, higher healthcare costs, and worse outcomes compared to non-transferred patients. Goals of care (GoC) discussions prior to transfer are necessary in patients at high risk for decline to ensure that the intended outcome of transfer is goal concordant. However, the frequency of these discussions is not well understood.

Phase 1 study of combinatorial sorafenib, G-CSF, and plerixafor treatment in relapsed/refractory, FLT3-ITD-mutated acute myelogenous leukemia patients.

Stroma-leukemia interactions mediated by CXCR4, CD44, VLA4, and their respective ligands contribute to therapy resistance in FLT3-ITD-mutated acute myelogenous leukemia (AML). We conducted a phase 1 study with the combination of sorafenib (a FLT3-ITD inhibitor), plerixafor (a SDF-1/CXCR4 inhibitor), and G-CSF (that cleaves SDF-1, CD44, and VLA4). Twenty-eight patients with relapsed/refractory FLT3-ITD-mutated AML were enrolled from December 2010 to December 2013 at three dose levels of sorafenib (400, 600, and 800 mg twice daily) and G-CSF and plerixafor were administered every other day for seven doses starting on day one.

Anomalous thickness-dependent electrical conductivity in van der Waals layered transition metal halide, NbCl.

Understanding the electronic transport properties of layered, van der Waals transition metal halides (TMHs) and chalcogenides is a highly active research topic today. Of particular interest is the evolution of those properties with changing thickness as the 2D limit is approached. Here, we present the electrical conductivity of exfoliated single crystals of the TMH, cluster magnet, NbCl, over a wide range of thicknesses both with and without hexagonal boron nitride (hBN) encapsulation.