Superconducting Pairing Symmetry in YBa2Cu3O7¡ x from a Study of Josephson Tunnel Junctions

H. E. Horng；L. M. Wang；S. Y. Yang；J. T. Jeng；H. C. Yang

Chinese Journal of Physics

38卷2S期（2000 / 04 / 01）

262 - 267

英文

The biepitaxial YBa2Cu3O7- x(YBCO)/CeO2/MgO Josephson junctions and c-axis YBCO/Au/Pb junctions have been fabricated to investigate the pairing state in YBCO. As a result, for the in-plane biepitaxial YBCO grain boundary junctions, both the integral and half-integral Shapiro steps are observed under zero applied magnetic field, suggesting the possibility of d-wave pairing in YBCO. On the other hand, Josephson tunneling currents have been observed on the YBCO/Au/Pb junctions with tunneling along the c axis of the YBCO films. The dependence of the Josephson critical current on the applied field for the YBCO/Au/Pb junctions exhibits an unconventional diffraction pattern which is close to the characteristic of a predominantly d-wave superconductor. The results are discussed in terms of the existing s-wave and d-wave symmetry theories.

1. 吳建欣(2016)。形狀記憶聚氨酯：合成，結構與性能。臺灣大學高分子科學與工程學研究所學位論文。2016。1-118。 
2. 蘇志中(2011)。奈米碳管叢/奈米碳螺旋線圈之成長、電熱性質與電熱元件之研究。國立臺灣大學機械工程學系學位論文。2011。1-166。 
3. 粘亞文(2016)。熱緊迫對土雞生長成績、產熱量及行為之影響。屏東科技大學熱帶農業暨國際合作系學位論文。2016。1-122。