High-energy spin excitations in the electron-doped superconductor Pr(0.88)LaCe(0.12)CuO(4-delta) with T(c) = 21 K

• Published in: Physical review letters Vol. 96; no. 15; p. 157001
• Main Authors: Wilson, Stephen D, Li, Shiliang, Woo, Hyungje, Dai, Pengcheng, Mook, H A, Frost, C D, Komiya, Seiki, Ando, Yoichi
• Format: Journal Article
• Language: English
• Published: United States 21.04.2006
• ISSN: 0031-9007
• DOI: 10.1103/PhysRevLett.96.157001

We use high-resolution inelastic neutron scattering to study the low-temperature magnetic excitations of the electron-doping superconductor Pr(0.88)LaCe(0.12)CuO(4-delta) (T(c) = 21 +/- 1 K) over a wide energy range (4 meV < or = homega < or = 330 meV). The effect of electron doping is to cause a wave vector (Q) broadening in the low-energy (homega < or = 80 meV) commensurate spin fluctuations at (0.5, 0.5) and to suppress the intensity of spin-wave-like excitations at high energies (homega > or = 100 meV). This leads to a substantial redistribution in the spectrum of the local dynamical spin susceptibility chi''(omega), and reveals a new energy scale similar to that of the lightly hole-doped YB2Cu3O(6.353) (T(c) = 18 K).