High-pressure studies of Charge-Density-Wave Superconductors

超导性和电荷密度波序是物质的有趣状态。特别是超导性具有巨大的技术潜力。超导体中电能的无损传输可用于节省大量能源。事实上，超导电力线的第一个原型正在美国和韩国建立。超导体还可以促进用于医疗保健中磁共振扫描的高稳定磁场，并且是通往量子计算的最有前途的路线之一。目前，由于对微观起源的理解有限，超导体的应用潜力受到限制。对超导性和相关现象的进一步理解可能会使其应用范围更广。该基金将研究超导性和电荷密度波序的相互作用。传统上，超导电性和电荷密度波序被认为是与超导电性竞争的，而超导电性往往由于电荷密度波序的存在而被削弱。然而，最近在高温铜氧化物超导体中发现的电荷密度波序提高了超导电性由电荷密度波序驱动的可能性。不幸的是，铜氧化物超导体是非常复杂的材料，很难将电荷密度波序的影响与其他现象分开。这就是为什么我们将研究不太复杂的模型系统，我们将探索在选定的模型材料中各种理论方案的极限，并将这些结果与高温氧化铜超导体联系起来。我们研究的材料，表现出促进超导性，以及共存和竞争的超导性。我们测量了超导电性和电荷密度波序的关键决定因素。我们将首次利用高压量子振荡研究来测量费米面和电子-声子耦合的演化。我们的新方法将阐明这些材料中的电荷密度波序和超导性的机制，并将指导超导性和电荷密度波序的理论以及由这些引起的有趣的材料性质。

Superconductivity and Charge-Density-Wave order are intriguing states of matter. In particular superconductivity has an enormous technological potential. The lossless transmission of electrical power in superconductors can be used to make huge energy savings. Indeed, first prototypes of superconducting power lines are being established in the USA and Korea. Superconductors also facilitate high stable magnetic fields used for magnetic resonance scanning in healthcare and are one of the most promising routes towards quantum computing.Currently the potential of superconductivity for applications is held back by limitations to the understanding of the microscopic origin. Further understanding of superconductivity and related phenomena is likely to allow much wider applications. This grant will study the interplay of Superconductivity and charge-density-wave order. Traditionally, the superconductivity and charge-density-wave order are thought to be in competition with superconductivity often weakened by the presence of charge-density-wave order. Yet, the recent discovery of charge-density-wave order in high-temperature copper-oxide superconductors raises the possibility of superconductivity being driven by charge-density-wave order. Unfortunately, copper-oxide superconductors are very complex materials where it is difficult to disentangle the effects of the charge-density-wave order from other phenomena. This is why we will study less complicated model systems.We explore the limits of various theoretical scenarios in selected model materials and relate those results to the high-temperature copper-oxide superconductors. We study materials that show a promotion of superconductivity, as well as coexisting and competing superconductivity. We measure the key determinants for the superconductivity and the charge-density-wave order. For the first time we will measure the evolution of the Fermi surface and electron-phonon coupling using high-pressure quantum oscillation studies. Our novel approach will shed light on the mechanism of both the charge-density-wave order and superconductivity in these materials and will guide theory on both superconductivity and charge-density-wave order and intriguing material properties caused by these.