(001)La $_{1.88}$ Sr $_{0.12}$ CuO $_4$薄膜中带隙中间态的空间调制:d波序参量的反相有序性
Spatial modulations of mid-gap states in (001)La$_{1.88}$Sr$_{0.12}$CuO$_4$ films: Indications for anti-phase ordering of the d-wave order parameter
摘要:
利用扫描隧道谱研究了本课题组在外延La $_{1.88}$ Sr $_{0.12}$ CuO $_4$薄膜中发现的异常c轴零偏压电导峰的空间演化。我们发现了相应的低能态密度的各向异性空间依赖性,其符合ab平面内d波序参量的反相序的预测光谱特征。最近提出的这种顺序来解释高温超导体中的1/8异常和最近报道的La $_{15/8}$ Ba $_{1/8}$ CuO $_4$输运研究中发生的动力学层去耦。
英文摘要:
Using scanning tunneling spectroscopy we have investigated the spatial evolution of the anomalous c-axis zero bias conductance peak, discovered in a previous study by our group, in epitaxial La$_{1.88}$Sr$_{0.12}$CuO$_4$ thin films. We found an anisotropic spatial dependence of the corresponding low-energy density of states which complies with the predicted spectral features of an anti-phase ordering of the d-wave order parameter within the ab-plane. Such an ordering was recently suggested to account for the 1/8 anomaly in the high temperature superconductors and the dynamical layer decoupling recently reported to occur in the transport studies of La$_{15/8}$Ba$_{1/8}$CuO$_4$.
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