Department of Applied Physics, University of Tokyo, Tokyo 113-8656, Japan.
Department of Applied Physics, Tokyo University of Science, Tokyo 125-8585, Japan.
Phys Rev Lett. 2015 Aug 14;115(7):077001. doi: 10.1103/PhysRevLett.115.077001. Epub 2015 Aug 11.
Quantum spin liquids, which are spin versions of quantum matter, have been sought after in systems with geometrical frustration. We show that disorder drives a classical magnet into a quantum spin liquid through conducting NMR experiments on an organic Mott insulator, κ-(ET){2}Cu[N(CN){2}]Cl. Antiferromagnetic ordering in the pristine crystal, when irradiated by x rays, disappears. Spin freezing, spin gap, and critical slowing down are not observed, but gapless spin excitations emerge, suggesting a novel role of disorder that brings forth a quantum spin liquid from a classical ordered state.
量子自旋液体是量子物质的自旋版本，一直在具有几何各向异性的系统中受到追捧。我们通过对有机莫特绝缘体 κ-(ET){2}Cu[N(CN){2}]Cl 进行传导 NMR 实验表明，无序通过传导 NMR 实验将经典磁体驱动进入量子自旋液体。原始晶体中当受到 X 射线照射时，反铁磁有序消失。自旋冻结、能隙和临界减速都没有观察到，但出现了无能隙的自旋激发，这表明无序的一个新作用是从经典有序态中产生出量子自旋液体。
