ANOMALOUSLY LARGE GAP ANISOTROPY IN THE A-B PLANE OF BI2SR2CACU2O8+DELTA
ANOMALOUSLY LARGE GAP ANISOTROPY IN THE A-B PLANE OF BI2SR2CACU2O8+DELTA
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DOI：
10.1103/physrevlett.70.1553
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发表时间：
1993-03-08
影响因子：
8.6
通讯作者：
PARK, CH
中科院分区：
文献类型：
--
作者：
SHEN, ZX;DESSAU, DS;PARK, CH
在角分辨光电子能谱中，Bi2Sr2CaCu2O8+δ的a-b平面上观察到超导能隙各向异性至少比传统超导体大一个数量级。对于 T(c) 为 88 K 的样品，间隙尺寸沿 Cu-O 键方向达到最大值约 20 meV，最小值在 45 度外小得多或消失。实验数据在各种理论模型的背景下进行讨论。特别是，与具有 d(x2-y2) 阶参数的超导体的预期进行了详细比较，得到了一致的图像。
Superconducting gap anisotropy at least an order of magnitude larger than that of the conventional superconductors has been observed in the a-b plane of Bi2Sr2CaCu2O8+delta in angle-resolved photoemission spectroscopy. For samples with T(c) of 88 K, the gap size reaches a maximum of approximately 20 meV along the Cu-O bond direction, and a minimum of much smaller or vanishing magnitude 45-degrees away. The experimental data are discussed within the context of various theoretical models. In particular, a detailed comparison with what is expected from a superconductor with a d(x2-y2) order parameter is carried out, yielding a consistent picture.