Polarized-neutron study of spin dynamics in the Kondo insulator YbB12

被引：46
|
作者：
Nemkovski, K. S. [1 ]
Mignot, J.-M.
Alekseev, P. A.
Ivanov, A. S.
Nefeodova, E. V.
Rybina, A. V.
Regnault, L.-P.
Iga, F.
Takabatake, T.
机构：
[1] Russian Res Ctr, LNSR, ISSSP, IV Kurchatov Atom Energy Inst, Moscow 123182, Russia
[2] CEA Saclay, CNRS, Lab Leon Brillouin, F-91191 Gif Sur Yvette, France
[3] Inst Max Von Laue Paul Langevin, F-38042 Grenoble, France
[4] CEA, DRFMC, SPSMS, F-38054 Grenoble 9, France
[5] Hiroshima Univ, Dept Quantum Matter, ADSM, Higashihiroshima 7398530, Japan
来源：
PHYSICAL REVIEW LETTERS | 2007年 / 99卷 / 13期
关键词：
D O I：
10.1103/PhysRevLett.99.137204
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
Inelastic neutron scattering experiments have been performed on the archetype compound YbB12, using neutron polarization analysis to separate the magnetic signal from the phonon background. With decreasing temperature, components characteristic for a single-site spin-fluctuation dynamics are suppressed, giving place to specific, strongly Q-dependent, low-energy excitations near the spin-gap edge. This crossover is discussed in terms of a simple crystal-field description of the incoherent high-temperature state and a predominantly local mechanism for the formation of the low-temperature singlet ground state.
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页数：4
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