无序引起的受扰有序:键无序的燕麦岩反铁磁体
无序系统与神经网络
2009-10-31 v2
摘要
经典海森尔反铁磁体晶格在燕麦岩上具有宏观且连续的退化性,系统在所有温度下均保持无序状态,即使存在微弱的稀释(非磁性离子)。我们指出,弱键无序可将ground state 退化性提升为局部共线自旋配置。我们给出了单个四面体的ground state 完全共线的证明,但指出两种机制会阻止全局共线态的形成:一种源于扰动,另一种源于高阶效应。因此我们获得了坚硬的能量景观,这对于解释真实系统中发现的玻璃现象至关重要,如最近由 Booth 等人报道的燕麦岩 Y_2Mo_2O_7 含有显著程度的键无序。
引用
@article{arxiv.cond-mat/0006306,
title = {Frustrated Order by Disorder: the Pyrochlore Antiferromagnet with Bond Disorder},
author = {L. Bellier-Castella and M. J. P. Gingras and P. C. W. Holdsworth and R. Moessner},
journal= {arXiv preprint arXiv:cond-mat/0006306},
year = {2009}
}
备注
2 Postscript figures included. Submitted to Canadian Journal of Physics for the Proceedings of the Higly Frustrated Magnetism 2000 Conference, Waterloo, Ontario, Canada, June 11-15, 2000 Contact: [email protected]