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- W1998478060 abstract "We report elastic, quasielastic (F dE), and inelastic neutron-scattering studies of the instantaneous and dynamic spin fluctuations in as-grown and doped ${mathrm{La}}_{2}$${mathrm{CuO}}_{4}$. Four samples have been studied: (A) as-grown ${mathrm{La}}_{2}$${mathrm{CuO}}_{4}$ with ${T}_{N}$=195 K, (B) oxygenated ${mathrm{La}}_{2}$${mathrm{CuO}}_{4}$ with ${mathit{T}}_{mathit{N}}$ensuremath{simeq}100 K, (C) ${mathrm{La}}_{2}$${mathrm{Cu}}_{0.95}$${mathrm{Li}}_{0.05}$${mathrm{O}}_{4}$, and (D) ${mathrm{La}}_{1.97}$${mathrm{Sr}}_{0.03}$${mathrm{Cu}}_{0.95}$${mathrm{Li}}_{0.05}$${mathrm{O}}_{4}$. All crystals exhibit variable-range-hopping conductivity behavior. At room temperature each sample exhibits two-dimensional (2D) antiferromagnetic instantaneous correlations in the ${mathrm{CuO}}_{2}$ sheets with correlation length varying from ensuremath{sim}200 Ar{} in crystal A to ensuremath{sim}14 Ar{} in crystal D. The integrated intensity and therefore the effective moment is, however, constant to within the experimental error. In samples A and B the 2D correlation length becomes sufficiently large with decreasing temperature that the interplanar coupling is able to drive a transition to 3D long-range order. The spin dynamics have been studied in detail in crystals A and B and quite unusual behavior is observed. In contrast to previously studied planar antiferromagnets, there is no significant Eensuremath{simeq}0 component for temperatures ensuremath{ge}${T}_{N}$ and instead the 2D response function is highly inelastic. The effective dispersion of the spin excitations is ensuremath{ge}0.4 eV Ar{}. This large energy scale for the spin fluctuations gives credence to models of the superconductivity in doped ${mathrm{La}}_{2}$${mathrm{CuO}}_{4}$ in which the pairing is magnetic in origin." @default.
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- W1998478060 title "Static and dynamic spin correlations in pure and doped<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>La</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math><mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>CuO</mml:mi></mml:mrow><mml:mrow><mml:mn>4</mml:mn></mml:mrow></mml:msub></mml:mrow…" @default.
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- W1998478060 doi "https://doi.org/10.1103/physrevb.37.7443" @default.
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