Bulletin of the American Physical Society
APS March Meeting 2018
Monday–Friday, March 5–9, 2018; Los Angeles, California
Session S05: Quantum Criticality and Novel Phases in Multipolar Systems
11:15 AM–2:15 PM,
Thursday, March 8, 2018
LACC Room: 152
Sponsoring Unit: DCMP
Chair: Meigan Aronson, Texas A&M Univ
Abstract: S05.00004 : Magnetic excitations in the quadrupolar ordered CeB6.*
1:03 PM–1:39 PM
Cerium hexaboride is a textbook example of an f-electron system hosting an exotic antiferroquadrupolar order. Even after decades of intense studies, it still lacks a complete theoretical description, and experiments continue to present puzzles in the form of unexpected observations. In recent years, we have scrutinized the magnetic excitation spectrum of CeB6 and its doped derivatives such as Ce1-xLaxB6 and Ce1-xNdxB6. In this symposium on f-electron materials, I would like to present our most recent results with a focus on magnetic-field and doping dependence of spin correlations and collective magnon excitations in these systems. We find clear signatures of long-range RKKY interactions between the f-electron multipoles in the diffuse quasielastic response in zero magnetic field that sensitively depends on charge doping. Further, field-induced collective magnon modes have been mapped out in fields up to 14.5 T applied along different crystallographic directions, revealing new high-field magnetic excitations that were not previously detected in electron spin resonance (ESR) or any other probes. I will also discuss the current progress towards the theoretical understanding of these results.
*This work was funded by the German Research Foundation under Grant No. IN 209/3-1 and via the Research Training Group GRK1621 at the TU Dresden.
The American Physical Society (APS) is a non-profit membership organization working to advance the knowledge of physics.
1 Physics Ellipse, College Park, MD 20740-3844
Editorial Office 1 Research Road, Ridge, NY 11961-2701 (631) 591-4000
Office of Public Affairs 529 14th St NW, Suite 1050, Washington, D.C. 20045-2001 (202) 662-8700