Interplay of Superconductivity, Quantum Oscillations, and Charge Density Wave in YBa2Cu3O6+x

1986年氧化铜高温超导体的发现引发了实验和理论研究的爆发，这些研究既提高了我们对其非常规特性的理解，也为未来的技术创新带来了希望。YBa2Cu3O6+x是所有铜酸盐中研究最多的一种，并且仍然是探索各种奇异量子相的肥沃材料，包括超导性，但并非详尽无遗。然而，三十年后，关于这些强相关材料的许多问题仍未解决。对欠掺杂铜酸盐的输运和费米表面性质的完整理解以及超导涡旋液体作为温度和磁场的函数的程度仍未得到解决。量子振荡技术允许我们利用磁场中靠近费米能量的电子的受限运动，在实验上探测并绘制出费米表面。博士项目的范围是在欠掺杂的YBa2Cu3O6+x中进行输运，热力学和量子振荡测量，以解决超导涡旋液态的程度，它与量子振荡的相互作用，以及潜在的电荷密度波作为高磁场和温度的函数。

The discovery of copper-oxide high temperature superconductors in 1986 triggered an explosion of experimental and theoretical research into both improving our understanding of their unconventional properties, and promises of future technological innovations. YBa2Cu3O6+x is one of the most studied of all cuprates and remains a fertile material for exploring various exotic quantum phases including, but not exhaustive to, superconductivity. After three decades, however, many questions regarding these strongly correlated materials remain unresolved. A complete understanding of the transport and Fermi surface properties of the underdoped cuprates remain unresolved, as well as the extent of the superconducting vortex liquid as a function of temperature and magnetic field. Quantum oscillation techniques allow us to experimentally probe and map out the Fermi surface by exploiting the constrained motion of the electrons near the Fermi energy in a magnetic field. The scope of the PhD project is to perform transport, thermodynamic, and quantum oscillation measurements in underdoped YBa2Cu3O6+x in order to resolve the extent of the superconducting vortex liquid state, its interplay with quantum oscillations, and potentially the charge density wave as a function of high magnetic fields and temperatures.