The Experts below are selected from a list of 20823 Experts worldwide ranked by ideXlab platform
Ilha A Aksay - One of the best experts on this subject based on the ideXlab platform.
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phonon and magnetic neutron scattering at 41 mev in yba2cu3o7
Physical Review Letters, 1995Co-Authors: H F Fong, P W Anderso, D Reznik, Fatih Doga, Ilha A AksayAbstract:We report inelastic neutron scattering measurements at excitation energies {h_bar}{omega}{similar_to}41 meV in YBa{sub 2}Cu{sub 3}O{sub 7}. We separate magnetic and phonon contributions to the scattering cross section by a detailed analysis of the momentum dependence of the Scattered Intensity. The previously reported broad peak around q=({pi}/{ital a},{pi}/{ital a}) in the normal state can be entirely accounted for by a phonon which primarily involves vibrations of the in-plane oxygen. Magnetic scattering centered around 41 meV and q=({pi}/{ital a},{pi}/{ital a}) appears in the superconducting state {ital only}. Theoretical implications of these findings are discussed.
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phonon and magnetic neutron scattering at 41 mev in yba2cu3o7
Physical Review Letters, 1995Co-Authors: H F Fong, D Reznik, B Keimer, P W Anderson, Fatih Dogan, Ilha A AksayAbstract:We report inelastic neutron scattering measurements at excitation energies $\ensuremath{\Elzxh}\ensuremath{\omega}\ensuremath{\sim}41$ meV in YB${\mathrm{a}}_{2}$C${\mathrm{u}}_{3}$${\mathrm{O}}_{7}$. We separate magnetic and phonon contributions to the scattering cross section by a detailed analysis of the momentum dependence of the Scattered Intensity. The previously reported broad peak around $\mathbf{q}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}(\ensuremath{\pi}/a,\ensuremath{\pi}/a)$ in the normal state can be entirely accounted for by a phonon which primarily involves vibrations of the in-plane oxygen. Magnetic scattering centered around 41 meV and $\mathbf{q}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}(\ensuremath{\pi}/a,\ensuremath{\pi}/a)$ appears in the superconducting state only. Theoretical implications of these findings are discussed.
E A Khazanov - One of the best experts on this subject based on the ideXlab platform.
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thermally induced scattering of radiation in laser ceramics with arbitrary grain size
Journal of The Optical Society of America B-optical Physics, 2012Co-Authors: Anton G Vyatkin, E A KhazanovAbstract:Thermally induced beam distortions in laser ceramics with arbitrary grain size have been investigated. A model for the spatial spectral density of dielectric permeability variations was suggested. The average Scattered Intensity was calculated using the small disturbances method (theory of Rayleigh–Debye scattering). The direction pattern of the Scattered field and the extinction coefficient have been obtained. The Scattered power and the depolarization ratio fit with the corresponding values obtained in the geometric optics approximation in the range of its validity.
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thermally induced scattering of radiation in laser ceramics with arbitrary grain size
LAT 2010: International Conference on Lasers Applications and Technologies, 2010Co-Authors: Anton G Vyatkin, E A KhazanovAbstract:Thermally induced beam distortions in laser ceramics with arbitrary grain size have been investigated. A model for the spatial spectral density of dielectric permeability variations was suggested. The average Scattered Intensity was carried out using the small disturbances method. The directional pattern of the Scattered field and the extinction coefficient have been obtained. The Scattered power and the depolarization ratio fit with the corresponding values obtained in the geometrical optics approximation in the range of its validity.
M Schmidbauer - One of the best experts on this subject based on the ideXlab platform.
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a novel multi detection technique for three dimensional reciprocal space mapping in grazing incidence x ray diffraction
Journal of Synchrotron Radiation, 2008Co-Authors: M Schmidbauer, P Schafer, S Besedin, D Grigoriev, R Kohler, M HankeAbstract:A new scattering technique in grazing-incidence X-ray diffraction geometry is described which enables three-dimensional mapping of reciprocal space by a single rocking scan of the sample. This is achieved by using a two-dimensional detector. The new set-up is discussed in terms of angular resolution and dynamic range of Scattered Intensity. As an example the diffuse scattering from a strained multilayer of self-assembled (In,Ga)As quantum dots grown on GaAs substrate is presented.
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imaging of nanoislands in coherent grazing incidence small angle x ray scattering experiments
Physical Review B, 2008Co-Authors: Alexey Zozulya, J Stangl, G Bauer, O M Yefanov, I A Vartanyants, K Mundboth, Cristian Mocuta, T H Metzger, T Boeck, M SchmidbauerAbstract:Coherent x-ray scattering in a grazing-incidence geometry was used to image SiGe nanoislands grown by liquid phase epitaxy on Si(001). Due to their narrow size distribution, identical shape, and orientation, the total Scattered Intensity obtained in this geometry represents a coherent diffraction pattern from an average island. Iterative phase retrieval techniques were used for the reconstruction of the projected electron density of hundred nanometer size islands. So far other x-ray imaging methods do not achieve the obtained spatial resolution of 10\char21{}15 nm for islands of this size.
Zhensen Wu - One of the best experts on this subject based on the ideXlab platform.
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fluctuation correlation of the Scattered Intensity from two dimensional rough surfaces
Optics Express, 2012Co-Authors: Geng Zhang, Zhensen WuAbstract:The fourth-order moment of the Scattered light, namely, the correlation function of the Scattered Intensity fluctuation from two-dimensional optically weak homogeneous and isotropic rough surfaces obeying Gaussian distribution are investigated based on Beckmann theory and Gaussian moment theorem. Analytical and numerical results are given for the correlation functions of the Scattered Intensity fluctuation. Also two important special cases, two-frequency correlation and angular correlation, are discussed, as well as the influence of the incident and observation conditions and the characteristic parameters of the rough surfaces on the correlation function which could lead to a more clear understanding of the scattering property of the rough surface and provide a theoretical basis for the 3D target recognition.
H F Fong - One of the best experts on this subject based on the ideXlab platform.
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phonon and magnetic neutron scattering at 41 mev in yba2cu3o7
Physical Review Letters, 1995Co-Authors: H F Fong, P W Anderso, D Reznik, Fatih Doga, Ilha A AksayAbstract:We report inelastic neutron scattering measurements at excitation energies {h_bar}{omega}{similar_to}41 meV in YBa{sub 2}Cu{sub 3}O{sub 7}. We separate magnetic and phonon contributions to the scattering cross section by a detailed analysis of the momentum dependence of the Scattered Intensity. The previously reported broad peak around q=({pi}/{ital a},{pi}/{ital a}) in the normal state can be entirely accounted for by a phonon which primarily involves vibrations of the in-plane oxygen. Magnetic scattering centered around 41 meV and q=({pi}/{ital a},{pi}/{ital a}) appears in the superconducting state {ital only}. Theoretical implications of these findings are discussed.
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phonon and magnetic neutron scattering at 41 mev in yba2cu3o7
Physical Review Letters, 1995Co-Authors: H F Fong, D Reznik, B Keimer, P W Anderson, Fatih Dogan, Ilha A AksayAbstract:We report inelastic neutron scattering measurements at excitation energies $\ensuremath{\Elzxh}\ensuremath{\omega}\ensuremath{\sim}41$ meV in YB${\mathrm{a}}_{2}$C${\mathrm{u}}_{3}$${\mathrm{O}}_{7}$. We separate magnetic and phonon contributions to the scattering cross section by a detailed analysis of the momentum dependence of the Scattered Intensity. The previously reported broad peak around $\mathbf{q}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}(\ensuremath{\pi}/a,\ensuremath{\pi}/a)$ in the normal state can be entirely accounted for by a phonon which primarily involves vibrations of the in-plane oxygen. Magnetic scattering centered around 41 meV and $\mathbf{q}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}(\ensuremath{\pi}/a,\ensuremath{\pi}/a)$ appears in the superconducting state only. Theoretical implications of these findings are discussed.
