Bulletin of the American Physical Society
APS March Meeting 2018
Volume 63, Number 1
Monday–Friday, March 5–9, 2018; Los Angeles, California
Session H44: Topological Insulators Including SmB6
2:30 PM–5:30 PM,
Tuesday, March 6, 2018
LACC
Room: 504
Sponsoring
Unit:
DCMP
Chair: Luis Balicas, Natl High Magnetic Field Lab
Abstract ID: BAPS.2018.MAR.H44.8
Abstract: H44.00008 : Screened Moments in a Kondo insulator: extrinsic origin of in-gap states in SmB6*
3:54 PM–4:06 PM
Presenter:
Wesley Fuhrman
(Johns Hopkins University)
Authors:
Wesley Fuhrman
(Johns Hopkins University)
Juan Chamorro
(Johns Hopkins University)
Pavel Alekseev
(Kurchatov Institute)
Jean-Michel Mignot
(CEA-CNRS)
Thomas Keller
(Max Planck)
Jose Rodriguez
(NIST NCNR)
Yiming Qiu
(NIST NCNR)
Predrag Nikolic
(George Mason University)
Tyrel McQueen
(Johns Hopkins University)
Collin Broholm
(Johns Hopkins University)
The small gap insulator SmB6 has long been known to have thermodynamic properties at odds with being an insulator, yet the extensive search for low-energy phenomena which could explain this has remained elusive and controversial even after 50 years of research into its unconventional nature. We have observed a Kondo impurity-like moment screening effect in the insulating state of nominally pure and Gd-doped SmB6 via heat capacity, magnetization, and resistivity measurements. High-resolution neutron scattering on the low energy regime confirms directly that no coherent magnetism is evident below the long-lived 13 meV spin exciton, restricting proposals of intrinsic neutral low-energy magnetic excitations.b We infer that the mixed valence, strongly-correlated nature of SmB6 elicits extreme sensitivity to impurities and defects which induce metal-like bulk properties.
** The work at IQM was supported by the US Department of Energy, office of Basic Energy Sciences, Division of Material Sciences and Engineering under grant DE-FG02-08ER46544.
*W.T.F. acknowledges support of the ARCS Foundation
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.MAR.H44.8
Follow Us |
Engage
Become an APS Member |
My APS
Renew Membership |
Information for |
About APSThe American Physical Society (APS) is a non-profit membership organization working to advance the knowledge of physics. |
© 2024 American Physical Society
| All rights reserved | Terms of Use
| Contact Us
Headquarters
1 Physics Ellipse, College Park, MD 20740-3844
(301) 209-3200
Editorial Office
100 Motor Pkwy, Suite 110, Hauppauge, NY 11788
(631) 591-4000
Office of Public Affairs
529 14th St NW, Suite 1050, Washington, D.C. 20045-2001
(202) 662-8700