High-sensitivity nuclear magnetic resonance at Giga-Pascal pressures: a new tool for probing electronic and chemical properties of condensed matter under extreme conditions.
High-sensitivity nuclear magnetic resonance at Giga-Pascal pressures: a new tool for probing electronic and chemical properties of condensed matter under extreme conditions.
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DOI：
10.3791/52243
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发表时间：
2014-10
期刊：
影响因子：
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通讯作者：
T. Meier;J. Haase
中科院分区：
文献类型：
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作者：
T. Meier;J. Haase
核磁共振（NMR）是研究凝聚态物质系统，其化学结构和电子性质的最重要技术之一。高压的应用使人们能够合成新材料，但已知材料对高压的响应是研究其电子结构和发展理论的非常有用的工具。例如，高压合成可能是生命的起源;了解小分子在极端压力下的行为将告诉我们更多关于我们宇宙中的基本过程。难怪人们一直对在高压下使用NMR很感兴趣。不幸的是，所需的压力通常在千兆帕斯卡（GPa）范围内，并且需要特殊的砧座装置，其中只有非常小的隔离体积可用。这在过去几乎完全限制了NMR的使用，直到最近，才提出了一种高灵敏度GPa NMR的新方法，该方法在样品室内具有谐振微线圈。这种方法使我们能够实现高灵敏度的实验，使核磁共振的力量，千兆帕斯卡压力凝聚态研究。第一个应用程序，在普通铝金属的拓扑电子跃迁的检测和高温超导性的赝间隙的关闭，显示了这种方法的力量。与此同时，可实现的压力范围大大增加了新一代的砧单元（高达10.1 GPa），适合标准孔NMR磁体。这种方法可能成为研究化学、地球化学和物理学中许多凝聚态系统的一种新的重要工具，因为我们现在可以用一种非常通用的探针来观察结构变化。
Nuclear Magnetic Resonance (NMR) is one of the most important techniques for the study of condensed matter systems, their chemical structure, and their electronic properties. The application of high pressure enables one to synthesize new materials, but the response of known materials to high pressure is a very useful tool for studying their electronic structure and developing theories. For example, high-pressure synthesis might be at the origin of life; and understanding the behavior of small molecules under extreme pressure will tell us more about fundamental processes in our universe. It is no wonder that there has always been great interest in having NMR available at high pressures. Unfortunately, the desired pressures are often well into the Giga-Pascal (GPa) range and require special anvil cell devices where only very small, secluded volumes are available. This has restricted the use of NMR almost entirely in the past, and only recently, a new approach to high-sensitivity GPa NMR, which has a resonating micro-coil inside the sample chamber, was put forward. This approach enables us to achieve high sensitivity with experiments that bring the power of NMR to Giga-Pascal pressure condensed matter research. First applications, the detection of a topological electronic transition in ordinary aluminum metal and the closing of the pseudo-gap in high-temperature superconductivity, show the power of such an approach. Meanwhile, the range of achievable pressures was increased tremendously with a new generation of anvil cells (up to 10.1 GPa), that fit standard-bore NMR magnets. This approach might become a new, important tool for the investigation of many condensed matter systems, in chemistry, geochemistry, and in physics, since we can now watch structural changes with the eyes of a very versatile probe.