Spin correlations among the charge carriers in an ordered stripe phase

We have observed a diffuse component to the low-energy magnetic excitation spectrum of stripe-ordered La5/3Sr1/3NiO4 probed by neutron inelastic scattering. The diffuse scattering forms a square pattern with sides parallel and perpendicular to the stripe directions. The signal is dispersive, with a maximum energy of ~10 meV. Probed at 2 meV the scattering decreases in strength with increasing temperature, and is barely visible at 100 K. We argue that the signal originates from dynamic, quasi- one-dimensional, antiferromagnetic correlations among the stripe electrons.Comment: 4 pages, 4 figures. To be published in Physical Review Letter

CD14 Deficiency Impacts Glucose Homeostasis in Mice through Altered Adrenal Tone

The toll-like receptors comprise one of the most conserved components of the innate immune system, signaling the presence of molecules of microbial origin. It has been proposed that signaling through TLR4, which requires CD14 to recognize bacterial lipopolysaccharide (LPS), may generate low-grade inflammation and thereby affect insulin sensitivity and glucose metabolism. To examine the long-term influence of partial innate immune signaling disruption on glucose homeostasis, we analyzed knockout mice deficient in CD14 backcrossed into the diabetes-prone C57BL6 background at 6 or 12 months of age. CD14-ko mice, fed either normal or high-fat diets, displayed significant glucose intolerance compared to wild type controls. They also displayed elevated norepinephrine urinary excretion and increased adrenal medullary volume, as well as an enhanced norepinephrine secretory response to insulin-induced hypoglycemia. These results point out a previously unappreciated crosstalk between innate immune- and sympathoadrenal- systems, which exerts a major long-term effect on glucose homeostasis

Kristallstrukturbestimmung an einer Strontium-hydrid-imid-nitrid-Phase – Sr2(H)N/SrNH\mathrm{Sr_2(H)N/SrNH} bzw. Sr2(D)N/SrND\mathrm{Sr_2(D)N/SrND} – mit Röntgen-, Neutronen- und Synchrotron-Strahlung

Strontium reacts with nitrogen and hydrogen or deuterium under defined conditions to form a phase in which hydride, imide and nitride ions are present side by side.Sr is evaporated at 1000 ° C. The reaction with N 2 and H 2 or D 2 (p (N 2 ) = p (H 2 / D 2 ) = 50 mbar) takes place in the gas phase. The product crystallizes as orange-yellow or black crystal needles at 800 ° C.Neither from X-ray single crystal nor from X-ray or neutron diffraction powder data could the crystal structure be clearly determined. Only a high-resolution diffraction experiment with synchrotron radiation at the powder gave decisive indications for a structural model:Fractions of reflections can only be explained with a model in R 3 m with a = 3,870 (1) Å and c = 18,958 (3) Å. Additional reflections show that, in addition to Sr 2 (H), there are N regions with SrNH as the second phase. The refinement of neutron diffraction data (measurements at 2 K, 10 K, 300 K and 505 K) with a two-phase model Sr 2 (D) N / SrND leads to a meaningful result: in a slightly distorted cubic dense arrangement of Sr atoms occupy layers in Domains Hydride and nitride ions or imide ions Octahedral gaps completely and ordered to one third each