OpenAccess

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2019-05-25
11:28
Embargoed OpenAccess [FZJ-2019-03070] Journal Article
et al
Revealing magnetic ground state of a layered cathode material by muon spin relaxation and neutron scattering experiments
Applied physics letters 114(20), 203901 - () [10.1063/1.5096620]
Although the majority of studies on battery materials have focused on enhancing their electrochemical performance, the understanding of their magnetic and atomic structures as well as the intimate connections between these structures and properties is significant. Muon spin relaxation (μSR) spectroscopy and neutron scattering techniques at low temperature have been used to explore the nature of the magnetic state of Li(Ni0.4Mn0.4Co0.2)O2 cathode materials. [...]
ddc:530
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2019-05-16
11:28
OpenAccess [FZJ-2019-02835] Journal Article

Model-independent recovery of interfacial structure from multi-contrast neutron reflectivity data
Neutron specular reflectivity at soft interfaces provides sub-nanometre information concerning the molecular distribution of thin films, while the application of contrast variation can highlight the scattering from different parts of the system and lead to an overall reduction in fitting ambiguity. Traditional modelling approaches involve the construction of a trial scattering length density profile based on initial speculation and the subsequent refinement of its parameters through minimization of the discrepancy between the calculated and measured reflectivity. [...]
ddc:540
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2019-04-30
11:28
OpenAccess [FZJ-2019-02815] Journal Article
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Anisotropic exchange Hamiltonian, magnetic phase diagram, and domain inversion of Nd2Zr2O7
We present thermodynamic and neutron-scattering measurements on the quantum spin ice candidate Nd2Zr2O7. The parametrization of the anisotropic exchange Hamiltonian is refined based on high-energy-resolution inelastic neutron-scattering data together with thermodynamic data using linear spin-wave theory and numerical linked-cluster expansion. [...]
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ddc:530
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2019-04-28
11:28
OpenAccess [FZJ-2019-02806] Journal Article
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Unconventional Antiferromagnetic Quantum Critical Point in Ba ( Fe 0.97 Cr 0.03 ) 2 ( As 1 − x P x ) 2
We have systematically studied physical properties of BaðFe0.97Cr0.03Þ2ðAs1−xPxÞ2, where super-conductivity in BaFe2ðAs1−xPxÞ2is fully suppressed by just 3% of Cr substitution of Fe. A quantum criticalpoint is revealed atx∼0.42, where non-Fermi-liquid behaviors similar to those in BaFe2ðAs1−xPxÞ2areobserved. [...]
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ddc:530
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2019-04-28
11:28
OpenAccess [FZJ-2019-02804] Journal Article
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Rearrangement of Uncorrelated Valence Bonds Evidenced by Low-Energy Spin Excitations in YbMgGaO 4
dc-magnetization data measured down to 40 mK speak against conventional freezing and reinstateYbMgGaO4as a triangular spin-liquid candidate. Magnetic susceptibility measured parallel andperpendicular to thecaxis reaches constant values below 0.1 and 0.2 K, respectively, thus indicatingthe presence of gapless low-energy spin excitations. [...]
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ddc:530
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2019-04-18
11:28
OpenAccess [FZJ-2019-02654] Journal Article
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Spin reorientation of the Fe moments in Eu0.5Ca0.5Fe2As2 : Evidence for strong interplay of Eu and Fe magnetism
Using complementary polarized and unpolarized single-crystal neutron diffraction, we have investigated the temperature-dependent magnetic structures of Eu0.5Ca0.5Fe2As2. Upon 50% dilution of the Eu sites with isovalent Ca2+, the Eu sublattice is found to be still long-range ordered below TEu=10 K, in the A-type antiferromagnetic (AFM) structure. [...]
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ddc:530
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2019-04-18
11:28
OpenAccess [FZJ-2019-02650] Journal Article
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Intermultiplet transitions and magnetic long-range order in Sm-based pyrochlores
We present bulk and neutron scattering measurements performed on the isotopically enriched 154Sm2Ti2O7 and 154Sm2Sn2O7 samples. Both compounds display sharp heat capacity anomalies, at 350 and 440 mK, respectively. [...]
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ddc:530
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2019-04-18
11:28
OpenAccess [FZJ-2019-02597] Journal Article
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Sonothrombolysis with Magnetically Targeted Microbubbles
Microbubble-enhanced sonothrombolysis is a promising approach to increasing the tolerability and efficacy of current pharmacological treatments for ischemic stroke. Maintaining therapeutic concentrations of microbubbles and drugs at the clot site, however, poses a challenge. [...]
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ddc:570
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2019-04-10
11:28
OpenAccess [FZJ-2019-02528] Journal Article
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Relaxing Kondo-screened Kramers doublets in CeRhSi 3
CeRhSi3 is a superconductor under pressure coexisting with a weakly antiferromagnetic phase characterized by a Bragg peak at →q0=(∼0.2,0,0.5) [N. Aso et al., J. [...]
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ddc:530
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2019-04-10
11:28
Embargoed OpenAccess [FZJ-2019-02515] Journal Article
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J-NSE-Phoenix, a neutron spin-echo spectrometer with optimized superconducting precession coils at the MLZ in Garching
A novel set of superconducting main precession coils has been built and installed in the Jülich-neutron spin-echo (J-NSE) spectrometer at the Heinz Maier-Leibnitz Zentrum (MLZ) in Garching. These unique new coils comprise a field-integral optimizing field shape, fringe field compensation, and high stability [...]
ddc:620
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