简介: |
Since the discovery of spin glasses in dilute magnetic systems, their study has been largely focused on understanding randomness and defects as the driving mechanism. The same paradigm has also been applied to explain glassy states found in dense frustrated systems. Recently, however, it has been theoretically suggested that different mechanisms, such as quantum fluctuations and topological features, may induce glassy states in defect-free spin systems, far from the conventional dilute limit. Here, we report experimental evidence for a glassy state induced by quantum fluctuations, a spin jam, that is realized in SrCr9pGa12-9pO19 [SCGO(p)], a highly frustrated magnet, in which the magnetic Cr3+ (s=3/2) ions form a quasi-two-dimensional triangular system of bipyramids. Our new experimental data and our theoretical spin jam model provide, for the first time, to our knowledge, a coherent understanding of the existing experimental data of this fascinating system. Furthermore, our findings strongly support the possible existence of purely topological glassy states.
References:
[1] Junjie Yang et al, Proc. Natl. Acad. Sci. USA 112, 11519 (2015).
[2] I. Klich, S.-H. Lee, and K. Iida, Nat. Commun. 5, 3497 (2014).
报告人简介：杨军杰博士于2005年毕业于天津大学物理系，2010年获得清华大学物理系理学博士学位。 2010年8月至2013年2月在韩国浦项工科大学物理系从事博士后研究，2013年3月至7月在德国固体化学物理研究所任访问学者，2013年10月至今在美国弗吉尼亚大学物理系任Research Scientist。他的主要研究领域是强关联电子材料的单晶生长、物性表征和中子散射，主要兴趣集中在量子阻挫磁体, 多铁性材料和铁基超导体方向。已发表SCI论文30篇，包括PNAS一篇, Nature Communication两篇, JACS一篇，PRL九篇等。 |
