نتایج جستجو برای: neutron scattering
تعداد نتایج: 152497 فیلتر نتایج به سال:
We report a neutron scattering study on the tetragonal compound Sr2Cu3O4Cl2, which has two-dimensional (2D) interpenetrating CuI and CuII subsystems, each forming a S=1/2 square lattice quantum Heisenberg antiferromagnet (SLQHA). The mean-field ground state is degenerate, since the intersubsystem interactions are geometrically frustrated. Magnetic neutron scattering experiments show that quantu...
I Direct measurements were made of neutron-proton elastic scattering differential cross sections at high energies. A neutron "beam with a continuous momentum spectrum between 1.2 and 6.7 GfeV/c was scattered off a liquid hydrogen target, and spark chambers were used to determine the neutron scattering single and, in a proton spectrometer, to measure the momentum and scattering angle of the reco...
where b~ is a length describing the strength of the interaction. The scattering cross-section may be readily derived 1"2 from V(r) using Fermi's Golden rule leading to (1). Any excitation in a solid or fluid that contributes to or leads to a density fluctuation can be observed in S(Q, to). For comparison with experiment, it is convenient to calculate the dynamic susceptibility corresponding to ...
We have developed a new scattering geometry for magnetic neutron scattering experiments on YBa2Cu307 in which the phonon background around q (E, -), Rw 40meV is significantly reduced. We use this new approach to study the previously detected &a& magnetic excitation at 4OmeV in the superconducting state in detail. The excitation does not shift substantially in energy up to at least 75K (-0.8T,)....
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