论文标题
高温超导体HGBA $ _2 $ CUO $ _ {4+δ} $中的Fermi-Surface重建范围
Extent of Fermi-surface reconstruction in the high-temperature superconductor HgBa$_2$CuO$_{4+δ}$
论文作者
论文摘要
高磁场显示出令人惊讶的小曲霉中的小曲霉表面，这可能是由于阶数参数破坏了晶体晶格的翻译对称性而导致的Fermi-Surface重建。一个关键的问题涉及该状态的兴奋剂及其与主要伪群和超导阶段的关系。我们在Cuprate HGBA上采用脉冲磁场测量值$ _2 $ cuo $ _ {4+δ} $，以从大厅效应的符号变化和温度依赖性平面电阻率的峰值中识别费米表面重建的签名。我们将Fermi-Surface重建的终止终止到两个孔浓度，在两个孔中发现超导上的临界场得到了增强。这些点之一与最佳掺杂接近的伪端终点有关。这些结果将Fermi-Surface重建与超导性和伪模现象联系起来。
High magnetic fields have revealed a surprisingly small Fermi-surface in underdoped cuprates, possibly resulting from Fermi-surface reconstruction due to an order parameter that breaks translational symmetry of the crystal lattice. A crucial issue concerns the doping extent of this state and its relationship to the principal pseudogap and superconducting phases. We employ pulsed magnetic field measurements on the cuprate HgBa$_2$CuO$_{4+δ}$ to identify signatures of Fermi surface reconstruction from a sign change of the Hall effect and a peak in the temperature-dependent planar resistivity. We trace the termination of Fermi-surface reconstruction to two hole concentrations where the superconducting upper critical fields are found to be enhanced. One of these points is associated with the pseudogap end-point near optimal doping. These results connect the Fermi-surface reconstruction to both superconductivity and the pseudogap phenomena.
