报告题目：Spin jam state induced by quantum fluctuations in a frustrated magnet

报 告 人：杨军杰, 美国弗吉尼亚大学物理系

报告时间：2016年1月5日9：30

报告地点：理科楼三楼报告厅（C302）

报告摘要：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. R

eferences:

[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).