A Comparison of the High-Frequency Magnetic Fluctuations in Insulating and Superconducting La2-xSrxCuO4
S. M. Hayden (University of Bristol), G. Aeppli (AT&T Bell, Laboratories), H. A. Mook (Oak Ridge National Laboratory), T. G. Perring, (Rutherford Laboratory), T. E. Mason (University of Toronto), S-W. Cheong, (AT&T Bell Laboratories), Z. Fisk (Florida State University)
TL;DR
This study uses inelastic neutron scattering to compare high-frequency magnetic fluctuations in insulating and superconducting La2-xSrxCuO4, revealing doping-induced spectral changes and a new energy scale in the superconducting phase.
Contribution
It provides the first absolute measurements of magnetic excitations in both insulating and superconducting La2-xSrxCuO4 over a broad energy range, highlighting doping effects.
Findings
Doping causes broadening of magnetic excitations.
Identification of a 22 meV energy scale in superconducting La2-xSrxCuO4.
Significant spectral changes due to Sr doping.
Abstract
Inelastic neutron scattering performed at a spallation source is used to make absolute measurements of the dynamic susceptibility of insulating La2CuO4 and superconducting La2-xSrxCuO4 over the energy range 15<EN<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 fluctuations. Comparison of the two compositions reveals a new energy scale of 22 meV in La1.86Sr0.14CuO4.
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