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Comparison of the High-Frequency Magnetic Fluctuations in Insulating and Superconducting<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>La</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn><mml:mo>−</mml:mo><mml:mi mathvariant="italic">x</mml:mi></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi>Sr</mml:mi></mml:mrow><mml:mrow><mml:mi mathvariant="italic">x</mml:mi></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:…
Inelastic neutron scattering performed at a spallation source is used to make absolute measurements of the dynamic susceptibility of insulating L${\mathrm{a}}_{2}$Cu${\mathrm{O}}_{4}$ and superconducting L${\mathrm{a}}_{1.86}$S${\mathrm{r}}_{0.14}$Cu${\mathrm{O}}_{4}$ over the energy range $15\ensuremath{\le}\ensuremath{\Elzxh}\ensuremath{\omega}\ensuremath{\le}350$ meV. The effect of Sr doping on the magnetic excitations is to cause a large broadening in the wave vector and …