Doping Dependent Evolution of the Fermi Surface and Competing Ordering Phenomena in Superconduction Cuprates

超导铜酸盐中费米面的掺杂相关演化和竞争有序现象

• 批准号: 165254915
• 负责人: Professor Dr. Rudolf Gross
• 金额: --
• 依托单位: Walther-Meißner-Institut für Tieftemperaturforschung
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2010
• 资助国家: 德国
• 起止时间: 2009-12-31 至 2012-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/165254915?language=en
• 关键词: Doping; Dependent; Evolution; Fermi; Surface

The detailed knowledge of the size and topology of the Fermi surface as well as its evolution with doping is a key ingredient for understanding the physics of the cuprate superconductors. So far, information on the Fermi surface has been mostly obtained from surface-sensitive ARPES experiments, suffering from surface polarization and self-doping effects. Fortunately, the quality of single crystals has been improved to a level, allowing for the first time for the observation of magnetic quantum oscillations (Shubnikovde Haas and de Haas-van Alphen effect). This opened up the possibility for a completely new class of experiments, providing the highly desired information on the bulk electronic properties of cuprate superconductors. The key goal of this proposal is the detailed and systematic study of the size and topology of the Fermi surface of various cuprate superconductors as well as its evolution with doping by means of magnetic quantum oscillations. Our experiments are based on ultra-clean single crystals, for which the observation of magnetic quantum oscillations has been successfully demonstrated very recently. They are expected to provide new and valuable information on the origin of superconductivity and competing ordering phenomena in the cuprate superconductors.

对费米表面的尺寸和拓扑结构及其随掺杂的演变的详细了解是理解铜酸盐超导体物理的关键因素。迄今为止，费米表面的信息大部分是通过表面敏感的ARPES实验获得的，受到表面极化和自掺杂效应的影响。幸运的是，单晶的质量已经提高到一个水平，首次可以观测到磁量子振荡（舒布尼科夫德哈斯和德哈斯-范阿尔芬效应）。这为全新的实验提供了可能性，提供了有关铜酸盐超导体的大量电子特性的非常理想的信息。该提案的主要目标是通过磁量子振荡对各种铜酸盐超导体费米表面的尺寸和拓扑及其掺杂演化进行详细和系统的研究。我们的实验基于超净单晶，最近已成功地证明了磁量子振荡的观察。他们有望提供有关铜酸盐超导体中超导性起源和竞争有序现象的新的有价值的信息。