Glassy behavior and isolated spin dimers in a new frustrated magnet BaCr9pGa12-9pO19

Junjie Yang, Anjana M. Samarakoon, Kyun Woo Hong, John R.D. Copley, Qingzhen Huang, Alan Tennant, Taku J. Sato, Seung Hun Lee

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

Using bulk susceptibility and neutron scattering techniques, we have studied a new frustrated magnet, BaCr9pGa12-9pO19 [BCGO(p)], with 0.4 ≲ p ≲ 0.9. This system is isostructural to SrCr9pGa12-9pO19 [SCGO(p)], in which the magnetic Cr3+ (3d3, s = 3/2) ions form a quasi-two-dimensional triangular lattice of bi-pyramids or kagome-triangle-kagome trilayers. Our bulk susceptibility data exhibit glassy behavior at temperatures much lower than the absolute values of the Curie-Weiss temperature ΘCW ≈ -695(1) K for BCGO(p = 0.902(8)). The frustration index |ΘCW|/Tf is as high as 190 for BCGO(p = 0.902(8)) indicating strong frustration. Our inelastic neutron scattering data on BCGO(p = 0.902(8)) reveal a dispersionless magnetic excitation centered at ℏω = 16.5(1) meV, due to a singlet to triplet excitation of spin s = 3/2 dimers. The spin dimers are formed by Cr3+ ions in two 4fvi layers that lie between 12k-2a-12k (kagome-triangle-kagome) trilayers. These results indicate that BCGO(p) is another good candidate system for a strongly frustrated quasi-two-dimensional magnet.

Original languageEnglish
Article number094712
Journaljournal of the physical society of japan
Volume85
Issue number9
DOIs
Publication statusPublished - 2016 Sep 15

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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