C.G.F. Blum

Ba 2 YIrO 6 : A cubic double perovskite material with Ir 5 + ions

Materials with a 5d4 electronic configuration are generally considered to have a nonmagnetic ground state (J=0). Interestingly, Sr2YIrO6 (Ir5+ having 5d4 electronic configuration) was recently reported to exhibit long-range magnetic order at low temperature and the distorted IrO6 octahedra were discussed to cause the magnetism in this material. Hence, a comparison of structurally distorted Sr2YIrO6 with cubic Ba2YIrO6 may shed light on the source of magnetism in such Ir5+ materials with 5d4 configuration. Besides, Ir5+ materials having 5d4 are also interesting in the context of recently predicted excitonic types of magnetism. Here we report a single-crystal-based analysis of the structural, magnetic, and thermodynamic properties of Ba2YIrO6. We observe that in Ba2YIrO6 for temperatures down to 0.4 K, long-range magnetic order is absent but at the same time correlated magnetic moments are present. We show that these moments are absent in fully relativistic ab initio band-structure calculations; hence, their origin is presently unclear.

Exploring the details of the martensite–austenite phase transition of the shape memory Heusler compound Mn2NiGa by hard x-ray photoelectron spectroscopy, magnetic and transport measurements

Mn2NiGa is reported to be a shape memory material with a martensite–austenite phase transition. Temperature dependent measurements of the transport and magnetic properties reveal the martensitic transition close to room temperature with a thermal hysteresis of about 27 K. The electronic structure of the valence band in both phases was studied by hard x-ray photoelectron spectroscopy. The results clearly indicate that strong changes in the electronic structure appear at the phase transition.

Transport and thermal properties of single- and polycrystalline NiZr0.5Hf0.5Sn

The thermoelectric properties of a Heusler compound with NiZr0.5Hf0.5Sn composition were studied. A comparison of the properties of a single crystal and a polycrystal was carried out by measurements of the electrical conductivity, Seebeck coefficient, and thermal conductivity. The transport properties are directly compared to the valence band electronic structure measured by photoelectron spectroscopy. The single crystal shows a higher figure of merit (ZTu2009=u20090.1) at room temperature which originates from the high electrical conductivity that is mediated by “in-gap” states observed by photoemission spectroscopy.

Crystal Growth and Electronic Phase Diagram of 4 d -doped Na 1- δ Fe 1- x Rh x As in Comparison to 3 d -doped Na 1- δ Fe 1- x Co x As

Single crystals of Na

de Haas-van Alphen effect and Fermi surface properties of single-crystal CrB2

_{1-delta}

Growth, characterization, and magnetic properties of a Li(Mn,Ni)PO4 single crystal

Fe

A calorimetric investigation of RbFe2As2 single crystals

_{1-x}

Flux growth and characterization of Sr2NiWO6 single crystals

T

Structural inhomogeneities in FeTe0.6Se0.4: Relation to superconductivity

_x

Single crystal growth of antiferromagnetic Mn3Si by a two-phase RF floating-zone method

As with T = Co, Rh have been grown using a self-flux technique. The crystals were thoroughly characterized by powder X-ray diffraction, magnetic susceptibility and electronic transport with particular focus on the Rh-doped samples. Measurements of the specific heat and ARPES were conducted exemplarily for the optimally doped compositions. The spin-density wave transition (SDW) observed for samples with low Rh concentration (