نتایج جستجو برای: la2cuo4
تعداد نتایج: 181 فیلتر نتایج به سال:
Inelastic neutron scattering performed at a spallation source is used to make absolute measurements of the dynamic susceptibility of insulating La2CuO4 and superconducting La1.86Sr0.14CuO4 over the energy range 15 ≤ h̄ω ≤ 350 meV. The effect of Sr doping on the magnetic excitations is to cause a large broadening in wavevector and a substantial change in the spectrum of the local spin fluctuation...
Superconductivity and charge-carrier localization in ultrathin La1.85Sr0.15CuO4/La2CuO4 bilayers K. Sen,1,* P. Marsik,1 S. Das,1,† E. Perret,1 R. de Andres Prada,1 A. Alberca,1,2 N. Biškup,3,4 M. Varela,3 and C. Bernhard1,‡ 1University of Fribourg, Department of Physics and Fribourg Center for Nanomaterials, Chemin du Musée 3, CH-1700, Fribourg, Switzerland 2Swiss Light Source, Paul Scherrer In...
The thermodynamics of layered antiferroand ferromagnets with a weak interlayer coupling and/or easy-axis anisotropy is investigated. A crossover from an isotropic 2D-like to 3D Heisenberg (or 2D Ising) regime is discussed within the renormalization group (RG) analysis. Analytical results for the the (sublattice) magnetization and the ordering temperature are derived are obtained in different re...
A systematic inelastic neutron scattering study of the superexchange interaction in three different undoped monolayer cuprates (La2CuO4, Nd2CuO4 and Pr2CuO4) has been performed using conventional triple axis technique. We deduce the in-plane antiferromagnetic (AF) superexchange coupling J which actually presents no simple relation versus crystallographic parameters. The absolute spectral weight...
We measured the high-resolution Cu L3 edge resonant inelastic x-ray scattering (RIXS) of undoped cuprates La2CuO4, Sr2CuO2Cl2, CaCuO2 and NdBa2Cu3O6. The dominant spectral features were assigned to dd excitations and we extensively studied their polarization and scattering geometry 8 Author to whom any correspondence should be addressed. 9 Present address: European Synchrotron Radiation Facilit...
Thl.: Ri elwc ld mc thod ofstructurl.: refinement from powder dilTr<:lction patterns is widely used with neutron data and int:reasingly so with x* ray data . [n this p<:lper the Ril.:tveld method has hccn cxplainl.:d. As an ex.ample the t: rystal :-.truclure of LazCu04 at rollm It:mperaturc has been refined using x*ray powder dirfr<:lctiol1 data. The crystal ,lruc lure is llflhorombi c wi...
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