Sidis Y, Bourges P, Fong H F, Keimer B, Regnault L P, Bossy J, Ivanov A, Hennion B, Gautier-Picard P, Collin G, Millius D L, Aksay I A
Laboratoire Léon Brillouin, CEA-CNRS, CE-Saclay, 91191 Gif sur Yvette, France.
Phys Rev Lett. 2000 Jun 19;84(25):5900-3. doi: 10.1103/PhysRevLett.84.5900.
The influence of magnetic (S=1) and nonmagnetic (S=0) impurities on the spin dynamics of an optimally doped high temperature superconductor is compared in YBa2(Cu0.97Ni0.03)3O7 (Tc=80 K) and YBa2(Cu0.99Zn0.01)3O7 (Tc=78 K). In the Ni-substituted system, the magnetic resonance peak (which is observed at Er approximately 40 meV in the pure system) shifts to lower energy with a preserved Er/Tc ratio while the shift is much smaller upon Zn substitution. By contrast Zn, but not Ni, restores significant spin fluctuations around 40 meV in the normal state. These observations are discussed in the light of models proposed for the magnetic resonance peak.
在YBa2(Cu0.97Ni0.03)3O7（Tc = 80 K）和YBa2(Cu0.99Zn0.01)3O7（Tc = 78 K）中，比较了磁性（S = 1）和非磁性（S = 0）杂质对最佳掺杂高温超导体自旋动力学的影响。在镍取代的体系中，磁共振峰（在纯体系中约40 meV处观察到）以保持的Er/Tc比率向较低能量移动，而锌取代时该移动要小得多。相比之下，锌而非镍在正常态下恢复了约40 meV处显著的自旋涨落。根据针对磁共振峰提出的模型对这些观测结果进行了讨论。
