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2017-04-07
08:43
OpenAccess [PUBDB-2017-01533] Journal Article
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Unraveling Local Spin Polarization of Zhang-Rice Singlet in Lightly Hole-Doped Cuprates Using High-Energy Optical Conductivity
ddc:530
Unrevealing local magnetic and electronic correlations in the vicinity of charge carriers is crucial in order tounderstand rich physical properties in correlated electron systems. Here, using high-energy optical conductivity(up to 35 eV) as a function of temperature and polarization, we observe a surprisingly strong spin polarizationof the local spin singlet with enhanced ferromagnetic correlations between Cu spins near the doped holesin lightly hole-doped $La_{1.95}Sr_{0.05}Cu_{0.95}Zn_{0.05}O_4$. [...]
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2017-03-29
09:17
OpenAccess [PUBDB-2017-01493] Journal Article
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Transparent polycrystalline cubic silicon nitride
ddc:000
Glasses and single crystals have traditionally been used as optical windows. Recently, there has been a high demand for harder and tougher optical windows that are able to endure severe conditions [...]
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2017-02-14
12:10
OpenAccess [PUBDB-2017-00957] Book/Report/Dissertation / PhD Thesis
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Automatic reduction of large x-ray fluorescence data-sets applied to XAS and mapping experiments
[DESY-THESIS-2016-007]
DESY-THESIS 130 pp., (2017) [10.3204/PUBDB-2017-00957]  GO
In this thesis two automatic methods for the reduction of large fluorescence data sets are presented.The first method is proposed in the framework of BioXAS experiments. The challenge of this experiment is to deal with samples in ultra dilute concentrations where the signal-to-background ratio is low. [...]
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2017-02-06
15:09
[PUBDB-2017-00878] Journal Article
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Lipid Matrices Destabilization Induced by Some Newly Synthesized Pyridinium Salts
ChemistrySelect 2(4), 1491 - 1496 (2017) [10.1002/slct.201601588]  GO
ddc:540
The influence of some newly synthesized pyridinium salts on the structural behavior of two lipid matrices formed with POPC or POPE was investigated by using SAXD. The structural impact / evolution of temperature scans were determined on samples prepared with different pyridinium salts / lipid helper molar ratio compositions, in water. [...]

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2017-01-10
11:24
[PUBDB-2017-00440] Journal Article
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UV-VUV synchrotron radiation spectroscopy of NiWO$_{4}$
ddc:530
Photoluminescence and excitation spectra of microcrystalline and nanocrystalline nickel tungstate (NiWO$_{4}$) were measured using UV-VUV synchrotron radiation source. The origin of the bands is interpreted using comparative analysis with isostructural ZnWO$_{4}$ tungstate and based on the results of recent first-principles band structure calculations. [...]
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2017-01-10
11:20
[PUBDB-2017-00439] Journal Article
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Ca$_{10}$Li(VO$_{4}$)$_{7}$:Nd$^{3+}$, a promising laser material: growth, structure and spectral characteristics of a Czochralski-grown single crystal
ddc:540
Pure and Nd-doped Ca$_{10}$Li(VO$_{4}$)$_{7}$ single crystals were grown by the Czochralski method. The structure of Ca$_{10}$Li(VO$_{4}$)$_{7}$ single crystal was refined starting from a model of Ca$_{10}$K(VO$_{4}$)$_{7}$ using the powder diffraction data collected at a laboratory high-resolution diffractometer. [...]
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2017-01-10
10:24
OpenAccess [PUBDB-2017-00428] Journal Article
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Strain distribution in single, suspended germanium nanowires studied using nanofocused x-rays
ddc:530
Within the quest for direct band-gap group IV materials, strain engineering in germanium is one promising route. We present a study of the strain distribution in single, suspended germanium nanowires using nanofocused synchrotron radiation. [...]
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2017-01-10
07:34
[PUBDB-2017-00359] Journal Article
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Generation of pressures over 40 GPa using Kawai-type multi-anvil press with tungsten carbide anvils
ddc:530
We have generated over 40 GPa pressures, namely, 43 and 44 GPa, at ambient temperature and 2000 K, respectively, using Kawai-type multi-anvil presses (KMAP) with tungsten carbide anvils for the first time. These high-pressure generations were achieved by combining the following pressure-generation techniques: (1) precisely aligned guide block systems, (2) high hardness of tungsten carbide, (3) tapering of second-stage anvil faces, (4) materials with high bulk modulus in a high-pressure cell, and (5) high heating efficiency..
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2017-01-09
14:06
[PUBDB-2017-00327] Journal Article
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Thermal decomposition of Yttrium(III) isovalerate in argon
ddc:660
The thermal behaviour of yttrium(III) isovalerate (Y(C$_4$H$_9$CO$_2$)$_3$) was studied in argon by means of thermogravimetry, differential thermal analysis, FTIR-spectroscopy, hot-stage optical microscopy and X-ray diffraction with a laboratory Cu-tube source as well as with a synchrotron radiation source. Two structural transitions take place in the solid state at 100 °C and 140 °C. [...]

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2016-11-23
14:16
Embargoed OpenAccess [PUBDB-2016-05544] Journal Article
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Strength and toughness of nanocrystalline SiO$_{2}$ stishovite toughened by fracture-induced amorphization
ddc:670
The finding of “fracture-induced amorphization” in nanocrystalline SiO$_2$ stishovite lead to a proposal of a new type of transformation toughening by the direct transition from crystal to amorphous state, which is different from the classical martensitic transformation of zirconia. Here, we investigated strength and toughness of nanocrystalline stishovite by using micro-cantilever beam specimens of different sizes. [...]
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