Bulletin of the American Physical Society
2023 APS March Meeting
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session T54: Kitaev and Honeycomb Systems
11:30 AM–2:18 PM,
Thursday, March 9, 2023
Room: Room 306
Sponsoring
Unit:
GMAG
Chair: Hitesh Changlani, Florida State University
Abstract: T54.00003 : μSR study of magnetism in Co-based honeycomb materials BaCo2(PO4)2 and BaCo2(AsO4)2
11:54 AM–12:06 PM
Author not Attending
Presenter:
Megan R Rutherford
(University of British Columbia)
Authors:
Megan R Rutherford
(University of British Columbia)
Dalmau Reig-i-Plessis
(University of British Columbia)
Alannah M Hallas
(University of British Columbia)
In the intervening years since Kitaev proposed his exactly solvable model, condensed matter physicists have been working to discover materials in which Kitaev-like interactions exist. In recent years, the scope of candidate Kitaev materials has been expanded to include 3d transition metals such as Co2+, which has moderately strong S-O coupling. BaCo2(XO4)2 (X = P, As) are examples of such materials, where the Co2+ ions form a highly frustrated, undistorted honeycomb lattice of Co2+ that are well separated by Ba and X layers. While these materials are isostructural, bulk property and neutron diffraction measurements show that they adopt very different magnetic ground states. Neutron diffraction of BaCo2(AsO4)2 reveals not one, but two distinct short range ordered states. BaCo2(AsO4)2, on the other hand, adopts long range order, but has shown evidence of being a field-induced, Kitaev quantum spin liquid. In this presentation, I will show muon spin relaxation data that show insight into the magnetism of each of these materials.
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