Neutron experiments as a test of anisotropic pairing in YBa2 Cu3 O7−δ and La2−x Srx CuO4

作者：Yuguo Zha, Kathryn Levin, Qimiao Si · 发表于：Physical review. B, Condensed matter · 年份：1993 · DOI：10.1103/physrevb.47.9124 · 被引用次数：69 · 研究领域：Physics of Superconductivity and Magnetism、Advanced Condensed Matter Physics、High-pressure geophysics and materials

We show that the anomalous temperature T dependences at low frequencies \ensuremath{\omega} observed in neutron measurements of the structure factor S(q,\ensuremath{\omega}) are compatible with a ${\mathit{d}}_{\mathit{x}}^{2}$-${\mathit{y}}^{2}$ pairing state. We further demonstrate that convincing verification of this anisotropic pairing also requires the observation of a q dependence which, in low-T neutron data, differs significantly from that above ${\mathit{T}}_{\mathit{c}}$. In the absence of such evidence, establishing the existence of the ${\mathit{d}}_{\mathit{x}}^{2}$-${\mathit{y}}^{2}$ state remains problematical.