1] Department of Physics, University of Virginia, Charlottesville, Virginia 22904, USA [2].
Department of Physics, University of Virginia, Charlottesville, Virginia 22904, USA.
Nat Commun. 2014 Apr 1;5:3497. doi: 10.1038/ncomms4497.
When spins are arranged in a lattice of triangular motif, the phenomenon of frustration leads to numerous energetically equivalent ground states, and results in exotic states such as spin liquid and spin ice. Here we report an alternative situation: a system, classically a liquid, freezes in the clean limit into a glassy state induced by quantum fluctuations. We call such glassy state a spin jam. The case in point is a frustrated magnet, where spins are arranged in a triangular network of bipyramids. Quantum corrections break the classical degeneracy into a set of aperiodic spin configurations forming local minima in a rugged energy landscape. This is established by mapping the problem into tiling with hexagonal tiles. The number of tessellations scales with the boundary length rather than its volume, showing the absence of local zero-energy modes. Low-temperature thermodynamics is discussed to compare it with other glassy materials.
当自旋排列在三角形图案的晶格中时，由于挫折现象导致了许多能量等效的基态，并产生了奇特的状态，如自旋液体和自旋冰。在这里，我们报告了一种替代情况：在干净的极限下，一个经典的液体系统通过量子涨落冻结成玻璃态。我们称这种玻璃态为自旋堵塞。具体情况是在一个受挫的磁体中，自旋排列在双金字塔的三角形网络中。量子修正将经典简并打破成一组非周期性的自旋构型，在崎岖的能量景观中形成局部最小值。这是通过将问题映射到具有六边形瓦片的平铺来建立的。平铺的数量与边界长度而不是体积成比例缩放，表明不存在局部零能模式。讨论了低温热力学以将其与其他玻璃态材料进行比较。
