Publications database

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2017-09-22
11:28
[FZJ-2017-06678] Journal Article
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Tetragonal To Collapsed Tetragonal Phase Transition In BaFe2As2 and CaFe2As2
INTERNATIONAL CONFERENCE ON PHYSICS OF EMERGING FUNCTIONAL MATERIALS (PEFM-2010), Meeting locationMumbai, (India),
AIP conference proceedings 1313(1), 349 (2010) [10.1063/1.3530541]
ddc:530
Superconductivity in MFe2As2 (M = Ba, Ca) compounds appears either at a critical doping level at ambient pressure or in the parent compound itself by application of pressure above a critical value. We report high pressure powder x‐ray diffractions studies for these compounds at 300 K up to about 56 GPa using membrane diamond anvil cells. [...]

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2017-09-22
11:28
OpenAccess [FZJ-2017-06677] Journal Article
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Anomalous phonons in CaFe 2 As 2 explored by inelastic neutron scattering3
ddc:530
Extensive inelastic neutron scattering measurements of phonons on a single crystal of CaFe2As2 allowed us to establish a fairly complete picture of phonon dispersions in the main symmetry directions. The phonon spectra were also calculated by density functional theory (DFT) in the local density approximation (LDA). [...]

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2017-09-22
11:28
[FZJ-2017-06676] Journal Article
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High-Pressure Structural Phase Transitions in FeAs Based Compounds at Ambient and Low Temperatures
SOLID STATE PHYSICS, PROCEEDINGS OF THE 55TH DAE SOLID STATE PHYSICS SYMPOSIUM 2010, Meeting locationManipal, (India),
AIP conference proceedings 1349, 103 (2011) [10.1063/1.3605758]
ddc:530
We report high pressure powder x‐ray diffractions studies for AFe2As2 (A = Ba and Ca) at high pressures up to 56 GPa at 300 K and low temperatures down to 33 K. A phase transition to a collapsed tetragonal phase is observed in AFe2As2. [...]

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2017-09-22
11:28
OpenAccess [FZJ-2017-06675] Journal Article
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Pressure-driven Phase Transition in CaFeAsF at 40 and 300 K
ddc:530
We carried out systematic investigation of high pressure crystal structure and structural phase transition upto 46 GPa at 40 K and 25 GPa at 300 K in CaFeAsF using powder synchrotron x-ray diffraction experiments. Rietveld analysis of the diffraction data at 40 K reveals a structural phase transition from an orthorhombic to a monoclinic phase at Pc = 13.7 GPa, while increasing pressure. [...]

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2017-09-16
12:24
OpenAccess [FZJ-2017-06043] Journal Article
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Spinon confinement in a quasi-one-dimensional anisotropic Heisenberg magnet
ddc:530
Confinement is a process by which particles with fractional quantum numbers bind together to formquasiparticles with integer quantum numbers. The constituent particles are confined by an attractive interactionwhose strength increases with increasing particle separation and, as a consequence, individual particles arenot found in isolation. [...]

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2017-09-16
12:24
OpenAccess [FZJ-2017-05842] Journal Article
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Discussion on data correction for Polarization Analysis with a 3 He spin filter analyzer
ddc:530
Fully polarized neutron reflectometry and grazing incidence small angle neutron scattering are effective methods to explore magnetic structures on the nm to μm length scales. This paper is an outline of how to fully correct for the polarization analysis (PA) inefficiencies of such an instrument and to determine the error contributions of the neutron polarizer and analyzer. [...]

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2017-09-10
11:29
OpenAccess [FZJ-2017-06416] Journal Article
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Magnetic targeting to enhance microbubble delivery in an occluded microarterial bifurcation
ddc:570
Ultrasound and microbubbles have been shown to accelerate the breakdown of blood clots both in vitro and in vivo. Clinical translation of this technology is still limited, however, in part by inefficient microbubble delivery to the thrombus. [...]

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2017-09-10
11:29
OpenAccess [FZJ-2017-06282] Journal Article
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Nanoscale rheology at solid-complex fluid interfaces
ddc:000
Here we present an approach to measure dynamic membrane properties of phospholipid membranes close to an interface. As an example we show results of the membrane dynamics of a phospholipid membrane multilayer-stack on a solid substrate (silicon). [...]

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2017-09-10
11:29
OpenAccess [FZJ-2017-03688] Journal Article
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Hydrostatic pressure effects on the static magnetism in Eu(Fe$_{0.925}$Co$_{0.075}$)$_{2}$As$_{2}$
ddc:000
EuFe2As2-based iron pnictides are quite interesting compounds, due to the two magnetic sublattices in them and the tunability to superconductors by chemical doping or application of external pressure. The effects of hydrostatic pressure on the static magnetism in Eu(Fe0.925Co0.075)2As2 are investigated by complementary electrical resistivity, ac magnetic susceptibility and single-crystal neutron diffraction measurements. [...]

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2017-09-08
11:28
OpenAccess [FZJ-2017-06419] Journal Article
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Spin dynamics of the magnetocaloric compound MnFe$_{4}$ Si$_{3}$
ddc:530
The magnetic excitation spectrum of the magnetocaloric compound MnFe4Si3 has been investigated by means of polarized and unpolarized inelastic neutron scattering on single crystals. Spectra were collected in the ferromagnetic phase (TC≈305K), as well as in the paramagnetic state, in order to understand the nature of the magnetism in MnFe4Si3. [...]

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