Evolution of spin excitations in electron-doped Pr0.88LaCe0.12CuO4−δ

✍ Scribed by Pengcheng Dai; Stephen D. Wilson; Shiliang Li

• Publisher: Elsevier Science
• Year: 2007
• Tongue: English
• Weight: 1002 KB
• Volume: 460-462
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/j.physc.2007.03.090

✦ Synopsis

We briefly review results of recent neutron scattering experiments designed to probe the evolution of antiferromagnetic (AF) order and spin dynamics in the electron-doped Pr 0.88 LaCe 0.12 CuO 4Àd as the system is tuned from its as-grown nonsuperconducting AF state into an optimally doped superconductor (T c = 24 K) without static AF order. For under doped materials, a quasi-two-dimensional spindensity-wave was found to coexist with three-dimensional AF order and superconductivity. In addition, the low energy spin excitations follow Bose statistics. In the case of optimally doped material, we have discovered a magnetic resonance intimately related to superconductivity analogous to the resonance in hole-doped materials. On the other hand, the low energy spin excitations have very weak temperature dependence and do not follow Bose statistics, in sharp contrast to the as-grown nonsuperconducting materials.