YbRhSn: a valence fluctuating system with ultra-low thermal conductivity.

YbRhSn crystallizes with a unique structural arrangement [space group 4/, = 9.6997(4) Å, = 13.7710(7) Å], which is related with primitive cubic YbRhSn and body-centered tetragonal (SnTb)TbRhSn types.

Graphene Magnetoresistance Control by Photoferroelectric Substrate.

Ultralow dimensionality of 2D layers magnifies their sensitivity to adjacent charges enabling even postprocessing electric control of multifunctional structures. However, functionalizing 2D layers remains an important challenge for on-demand device-property exploitation. Here we report that an electrical and even fully optical way to control and write modifications to the magnetoresistive response of CVD-deposited graphene is achievable through the electrostatics of the photoferroelectric substrate.

Single Wavelength Operating Neuromorphic Device Based on a Graphene-Ferroelectric Transistor.

As global data generation continues to rise, there is an increasing demand for revolutionary in-memory computing methodologies and efficient machine learning solutions. Despite recent progress in electrical and electro-optical simulations of machine learning devices, the all-optical nonthermal function remains challenging, with single wavelength operation still elusive. Here we report on an optical and monochromatic way of neuromorphic signal processing for brain-inspired functions, eliminating the need for electrical pulses.

Heat Capacity Function, Enthalpy of Formation and Absolute Entropy of Mg(AlH ).

In this investigation, we set out first to characterize the thermodynamics of Mg(AlH ) and secondly to use the determined data to reevaluate and update existing estimation procedures for heat capacity functions, enthalpies of formation and absolute entropies of alanates. Within this study, we report the heat capacity function of Mg(AlH ) in the temperature range from 2 K to 370 K and its enthalpy of formation and absolute entropy at 298.15 K, being  kJ mol and 133.

Superconductivity of structurally disordered YIrSn.

The structural and physical properties of YIrSn grown from Sn-flux as large single crystals are studied. YIrSn crystallizes with a unique structure [space group 3̄, = 13.7706(1) Å], which is characterized by a strong disorder.

Pressure Tuning of Superconductivity of LaPtGe and PrPtGe Single Crystals.

We carried out electrical resistivity and X-ray diffraction (XRD) studies on the filled skutterudite superconductors LaPt4Ge12 and PrPt4Ge12 under hydrostatic pressure. The superconducting transition temperature Tc is linearly suppressed upon increasing pressure, though the effect of pressure on Tc is rather weak. From the analysis of the XRD data, we obtain bulk moduli of B=106 GPa and B=83 GPa for LaPt4Ge12 and PrPt4Ge12, respectively.

Composition dependent polymorphism and superconductivity in Y{Rh,Ir}Ge.

Polymorphism is observed in the YRhGe series. The decrease of Y-content leads to the transformation of the primitive cubic YRhGe [ = 0.6, space group 3̄, = 8.

Crystal, electronic and magnetic structures of a novel series of intergrowth carbometalates RCoC (R = Y, Gd, Tb).

A series of new ternary isostructural RCoC (R = Y, Gd, Tb) carbides was synthesized by annealing of arc-melted stoichiometric samples. The crystal structure of TbCoC [space group P2/m, Pearson symbol mP18, a = 12.754(2) Å, b = 3.

Crystal structure, phase transition and properties of indium(III) sulfide.

Poly- and single-crystalline samples of In0.67□0.33In2S4 thiospinel were obtained by various powder metallurgical and chemical vapor transport methods, respectively.

Crystal Structure and Physical Properties of the Cage Compound HfBIr.

HfBIr crystallizes with a new type of structure: space group , = 5.6300(3) Å, = 11.2599(5) Å, and = 3.

Structure variations within RSi and RSi silicides. Part II. Structure driving factors.

To gain an overview of the various structure reports on RSi and RTSi compounds (R is a member of the Sc group, an alkaline earth, lanthanide or actinide metal, T is a transition metal), compositions, lattice parameters a and c, ratios c/a, formula units per unit cell, and structure types are summarized in extensive tables and the variations of these properties when varying the R or T elements are analyzed. Following the structural systematization given in Part I, Part II focuses on revealing the driving factors for certain structure types, in particular, the electronic structure. Here, concepts of different complexity are presented, including molecular orbital theory, the principle of hard and soft acids and bases, and a Bader analysis based on Density Functional Theory calculations for representatives of the reported structure types.

Structure variations within RSi and RTSi silicides. Part I. Structure overview.

Here, structural parameters of various structure reports on RSi and RTSi compounds [where R is an alkaline earth metal, a rare earth metal (i.e. an element of the Sc group or a lathanide), or an actinide and T is a transition metal] are summarized.

Crystal structure, chemical bonding, and electrical and thermal transport in ScRhSn.

Single crystals of ScRhSn were grown from Sn-flux. The crystal structure (SG: I4/acd, a = 13.5529(2) Å, c = 27.

Structural Peculiarities and Thermoelectric Study of Iron Indium Thiospinel.

The homogeneity range of ternary iron indium thiospinel at 873 K was investigated. A detailed study was focused on two distinct series (y=z): 1) a previously reported charge-balanced (In □ ) [In Fe ] S (A1-series; □ stands for vacancy; the abbreviations "tetr" and "oct" indicate atoms occupying tetrahedral 8a and octahedral 16d sites, respectively) and 2) a new charge-unbalanced (In □ ) [In Fe ] S (A2-series). Fe atoms were confirmed to exclusively occupy an octahedral position in both series.

Crystal structure and superconducting properties of ScIrSn.

ScIrSn crystallizes with a split variant of the TbRhSn structure type (space group I4/acd, [Formula: see text] [Formula: see text], [Formula: see text] [Formula: see text]). DFT calculations confirmed the instability of the structural arrangement with the fully occupied and unsplit crystallographic sites. High quality single crystals were grown from a Sn melt.

Structural stability and thermoelectric performance of high quality synthetic and natural pyrites (FeS).

Synthetic bulk and natural pyrite from the hydrothermal mine in Schönbrunn (Saxony, Germany) are confirmed to be stoichiometric FeS2 compounds and stable (for thermoelectric applications) up to ∼600 K by combined thermal, chemical, spectroscopic and X-ray diffraction analyses. Natural pyrite with a small amount (<0.6 wt%) of well-defined transition metal carbonates revealed characteristics of a nondegenerate semiconductor and is suitable as a model system for the investigation of thermoelectric performance.

Indium thiospinel In□InS- structural characterization and thermoelectric properties.

A detailed study of polycrystalline indium-based In□InS (x = 0.16, 0.22, 0.

Cluster Formation in the Superconducting Complex Intermetallic Compound BePt.

Materials with the crystal structure of γ-brass type (CuZn type) are typical representatives of intermetallic compounds. From the electronic point of view, they are often interpreted using the valence electron concentration approach of Hume-Rothery, developed previously for transition metals. The γ-brass-type phases of the main-group elements are rather rare.

Two-gap superconductivity in Ag MoS Chevrel phase.

The superconducting properties of [Formula: see text]MoS [[Formula: see text]] Chevrel phase [[Formula: see text] K] are studied on a sample compacted by spark plasma sintering. Both lower ([Formula: see text] mT) and the upper [[Formula: see text] T] critical magnetic fields are obtained from magnetization and electrical resistivity measurements for the first time. The analysis of the low-temperature electronic specific heat indicates [Formula: see text]MoS to be a two band superconductor with the energy gaps [Formula: see text] meV (95%) and [Formula: see text] meV (5%).

Tuning a sign of magnetoelectric coupling in paramagnetic NH(CH)AlCr(SO) × 6HO crystals by metal ion substitution.

Hybrid organometallic systems offer a wide range of functionalities, including magnetoelectric (ME) interactions. However, the ability to design on-demand ME coupling remains challenging despite a variety of host-guest configurations and ME phases coexistence possibilities. Here, we report the effect of metal-ion substitution on the magnetic and electric properties in the paramagnetic ferroelectric NH(CH)Al Cr (SO) × 6HO.

Hierarchical and chemical space partitioning in new intermetallic borides MNiB (M = In, Sn).

The compounds MNiB (M = In, Sn) have been synthesized and their cubic crystal structure determined (space group Pm3[combining macron]m, lattice parameters a = 7.1730(1) Å and a = 7.1834(1) Å, respectively).

Optical Writing of Magnetic Properties by Remanent Photostriction.

We present an optically induced remanent photostriction in BiFeO_{3}, resulting from the photovoltaic effect, which is used to modify the ferromagnetism of Ni film in a hybrid BiFeO_{3}/Ni structure. The 75% change in coercivity in the Ni film is achieved via optical and nonvolatile control. This photoferromagnetic effect can be reversed by static or ac electric depolarization of BiFeO_{3}.

Ternary borides Nb7Fe3B8 and Ta7Fe3B8 with Kagome-type iron framework.

Two new ternary borides TM7Fe3B8 (TM = Nb, Ta) were synthesized by high-temperature thermal treatment of samples obtained by arc-melting. This new type of structure with space group P6/mmm, comprises TM slabs containing isolated planar hexagonal [B6] rings and iron centered TM columns in a Kagome type of arrangement. Chemical bonding analysis in Nb7Fe3B8 by means of the electron localizability approach reveals two-center interactions forming the Kagome net of Fe and embedded B, while weaker multicenter bonding present between this net and Nb atoms.

Kondo effect and thermoelectric transport in CePd3Be x.

The physical properties of the series CePd3Be(x) (0 ≤ x ≤ 0.47) have been studied. Introducing Be into CePd3 results in a drastic reduction of the Seebeck coefficient from 100 μV K(-1) at 300 K to  -2 μV K(-1), respectively.