Anomalous Fermi-surface dependent pairing in a self-doped high-Tc superconductor.
Anomalous Fermi-surface dependent pairing in a self-doped high-Tc superconductor.
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DOI：
10.1103/physrevlett.97.236401
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发表时间：
2006-11
影响因子：
8.6
通讯作者：
Yulin Chen;A. Iyo;Wanli Yang;Xingjiang Zhou;D. Lu;H. Eisaki;T. Devereaux;Z. Hussain;Z. Shen
中科院分区：
文献类型：
--
作者：
Yulin Chen;A. Iyo;Wanli Yang;Xingjiang Zhou;D. Lu;H. Eisaki;T. Devereaux;Z. Hussain;Z. Shen
本文报道了一种自掺杂多层高Tc超导体Ba_2Ca_3Cu_4 O_8 F_2（F_（0234））的发现，它沿其两个费米面片具有明显不同的超导能隙大小沿着.虽然正式的化合价计算意味着这种材料是一种未掺杂的绝缘体，但它是一种自掺杂的超导体，Tc为60 K，同时拥有电子和空穴掺杂的费米表面片。有趣的是，费米面片的特征是带隙大得多，它是电子掺杂的，它的形状不利于两个电子特征，这两个电子特征被认为对配对机制很重要：货车霍韦奇点和反铁磁（pi/a，pi/a）散射。
We report the discovery of a self-doped multilayer high Tc superconductor Ba2Ca3Cu4O8F2 (F0234) which contains distinctly different superconducting gap magnitudes along its two Fermi-surface sheets. While formal valence counting would imply this material to be an undoped insulator, it is a self-doped superconductor with a Tc of 60 K, possessing simultaneously both electron- and hole-doped Fermi-surface sheets. Intriguingly, the Fermi-surface sheet characterized by the much larger gap is the electron-doped one, which has a shape disfavoring two electronic features considered to be important for the pairing mechanism: the van Hove singularity and the antiferromagnetic (pi/a, pi/a) scattering.