Bilitewski Thomas, Zhitomirsky Mike E, Moessner Roderich
Max-Planck-Institut für Physik komplexer Systeme, Nöthnitzer Straße 38, 01187 Dresden, Germany.
Universite Grenoble Alpes, CEA, INAC-Pheliqs, 38000 Grenoble, France.
Phys Rev Lett. 2017 Dec 15;119(24):247201. doi: 10.1103/PhysRevLett.119.247201. Epub 2017 Dec 11.
We study a class of continuous spin models with bond disorder including the kagome Heisenberg antiferromagnet. For weak disorder strength, we find discrete ground states whose number grows exponentially with system size. These states do not exhibit zero-energy excitations characteristic of highly frustrated magnets but instead are local minima of the energy landscape. This represents a spin liquid version of the phenomenon of jamming familiar from granular media and structural glasses. Correlations of this jammed spin liquid, which upon increasing the disorder strength gives way to a conventional spin glass, may be algebraic (Coulomb type) or exponential.
我们研究了一类具有键无序的连续自旋模型，其中包括 Kagome 海森堡反铁磁体。对于弱无序强度，我们发现离散的基态，其数量随系统大小呈指数增长。这些态不表现出高度受挫磁体所特有的零能量激发，而是能量景观的局部最小值。这代表了一种自旋液体版本的、在颗粒介质和结构玻璃中熟知的堵塞现象。这种堵塞自旋液体的关联，在增加无序强度时会转变为传统的自旋玻璃，其关联可能是代数的（库仑型）或指数的。
