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

Stephen D Wilson; Shiliang Li; Hyungje Woo; Pengcheng Dai; H A Mook; C D Frost; Seiki Komiya; Yoichi Ando

doi:10.1103/PhysRevLett.96.157001

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

Phys Rev Lett. 2006 Apr 21;96(15):157001. doi: 10.1103/PhysRevLett.96.157001. Epub 2006 Apr 18.

Authors

Stephen D Wilson¹, Shiliang Li, Hyungje Woo, Pengcheng Dai, H A Mook, C D Frost, Seiki Komiya, Yoichi Ando

Affiliation

¹ Department of Physics and Astronomy, The University of Tennessee, Knoxville, Tennessee 37996-1200, USA.

PMID: 16712186
DOI: 10.1103/PhysRevLett.96.157001

Abstract

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).