Muon Spin Relaxation Studies in Frustrated and/or Low Dimensional Spin Systems

小行星9510454 μ子自旋弛豫（muSR）测量被提出来研究几何受抑自旋系统中的基态性质和自旋涨落，例如Kagome晶格和三角晶格反铁磁体锶铬（x）镓（12-x）氧（19）和锂镍氧（2），以及低维自旋系统，包括掺杂的Haldron自旋链系统（钇、钙）（2）钡镍氧（5），自旋佩尔斯体系（铜，锌）锗氧（3），一维有机导体铝碳（60），和自旋阶梯铜酸盐，锶（n-1）铜（n+1）氧（2n）。 该提议旨在揭示所建议的自旋液体基态的细节，以及阐明由于以下原因导致的多体单重态基态的破坏过程： 引入缺陷或掺杂的电荷载流子。 muSR实验将在加拿大温哥华的TRIUMF设施进行。 固体中原子排列的某些构型，如三角形或Kagome晶格，往往会阻止放置在其上的原子的磁矩对齐，促进磁矩的动态波动（自旋）。 类似地，在自旋的低维排列中，磁有序被抑制，例如磁矩链。 在这些系统中，预期在低温下的新的磁性行为，包括出现“量子自旋液体”的可能性，其是由于量子力学效应而导致的无序液体状的动态状态。 该提案旨在通过利用一种称为μ子自旋弛豫（muSR）的新技术来揭示这种奇异磁性行为的性质，该技术利用高强度质子加速器（加拿大温哥华的TRIUMF设施）产生的放射性基本粒子μ子来探测固体内的磁性。

9510454 Uemura Muon spin relaxation (muSR) measurements are proposed to study ground state properties and spin fluctuations in geometrically frustrated spin systems, such as the Kagome lattice and triangular lattice antiferromagnets strontium chromium (x) gallium (12-x) oxygen (19) and lithium nickel oxygen (2), as well as in low-dimensional spin systems, including the doped Haldane spin chain system (yttrium, calcium) (2) barium nickel oxygen (5), the spin-Peierls system (copper, zinc) germanium oxygen (3), the one-dimensional organic conductor aluminum carbon (60), and the spin-ladder cuprates, strontium (n-1) copper (n+1) oxygen (2n). This proposal aims to reveal details of suggested spin-liquid ground states as well as to elucidate the process of destruction of the many-body singlet ground state due to the introduction of imperfections or doped charge carriers. The muSR experiments will be performed at the TRIUMF facility in Vancouver, Canada. %%% Certain configurations of atomic arrangements in solids, such as the triangular or Kagome lattice, tend to prevent the alignment of the magnetic moments of the atoms placed on it, promoting dynamic fluctuations of the moments (spins). Similarly, magnetic ordering is suppressed in low-dimensional arrangements of spins, such as a chain of magnetic moments. In these systems, novel magnetic behavior is expected at low temperatures, including the possibility for the occurrence of a "quantum spin liquid", which is a disordered liquid- like dynamic state of the moments due to quantum-mechanical effects. This proposal aims to reveal the nature of such exotic magnetic behavior by utilizing a novel technique called muon spin relaxation (muSR), which probes the magnetism within solids with radioactive elementary particles, muons, produced at a high-intensity proton accelerator (the TRIUMF facility in Vancouver , Canada).