Spin jam induced by quantum fluctuations in a frustrated magnet

Junjie Yang, Anjana Samarakoon, Sachith Dissanayake, Hiroaki Ueda, Israel Klich, Kazuki Iida, Daniel Pajerowski, Nicholas P. Butch, Q. Huang, John R.D. Copley, Seung Hun Lee

Research output: Contribution to journalArticlepeer-review

18 Scopus citations


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 defectfree spin systems, far from the conventional dilute limit. Here we report experimental evidence for existence of a glassy state, which we call a spin jam, in the vicinity of the clean limit of a frustrated magnet, which is insensitive to a low concentration of defects. We have studied the effect of impurities on SrCr9pGa12-9pO19 [SCGO(p)], a highly frustrated magnet, in which the magnetic Cr3+ (s = 3/2) ions form a quasi-2D triangular system of bipyramids. Our experimental data show that as the nonmagnetic Ga3+ impurity concentration is changed, there are two distinct phases of glassiness: an exotic glassy state, which we call a spin jam, for the high magnetic concentration region (p>0.8) and a cluster spin glass for lower magnetic concentration (p<0.8). This observation indicates that a spin jam is a unique vantage point from which the class of glassy states of dense frustrated magnets can be understood.

Original languageEnglish (US)
Pages (from-to)11519-11523
Number of pages5
JournalProceedings of the National Academy of Sciences of the United States of America
Issue number37
StatePublished - Sep 15 2015
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • General


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