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ID 18716
file
creator
Mignot, Jean-Michel
Alekseev, Pavel A.
Nemkovski, K.S.
Regnault, Louis-Pierre
Iga, Fumitoshi
abstract
The spin dynamics of mixed-valence YbB12 has been studied by inelastic neutron scattering on a high-quality single crystal. In the Kondo-insulating regime realized at low temperature, the spectra exhibit a spin-gap structure with two sharp, dispersive, in-gap excitations at hω = 14.5 and = 20meV. The lower mode is shown to be associated with short-range correlations near the antiferromagnetic wave vector q0=(1/2, 1/2, 1/2). Its properties are in overall agreement with those expected for a "spin-exciton" branch in an indirect hybridization gap semiconductor.
journal title
Physical Review Letters
volume
Volume 94
issue
Issue 24
start page
247204-1
end page
247204-4
date of issued
2005-06-21
publisher
American Physical Society
issn
0031-9007
ncid
publisher doi
language
eng
nii type
Journal Article
HU type
Journal Articles
DCMI type
text
format
application/pdf
text version
publisher
rights
Copyright (c) 2005 American Physical Society.
relation url
department
Graduate School of Advanced Sciences of Matter