High Energy Spin Excitations in Electron-Doped Superconducting Pr${}_{0.88}$LaCe${}_{0.12}$CuO${}_{4-\delta }$ with $T_c=21$ K

Abstract

We use high-resolution inelastic neutron scattering to study the low-temperature magnetic excitations of electron-doped superconducting Pr${}_{0.88}$LaCe${}_{0.12}$CuO${}_{4-\delta }$ ($T_c=21\pm 1$ K) over a wide energy range (4 meV$\le \hslash \omega \le 330$ meV). The effect of electron-doping is to cause a wave vector ($Q$) broadening in the low-energy ($\hslash \omega \le 80$ meV) commensurate spin fluctuations at ($\pi$,$\pi$) and to suppress the intensity of spin-wave-like excitations at high energies ($\hslash \omega \ge 100$ meV). This leads to a substantial redistribution in the spectrum of the local dynamical spin susceptibility ${\chi }^{\prime \prime }(\omega )$, and reveals a new energy scale similar to that of the lightly hole-doped YB${}_2$Cu${}_3$O${}_{6.353}$ ($T_c=18$ K).

arXiv comment4 figures and 4 pages. Accepted by Phys. Rev. Lett.; Published April 18th, 2006

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