Magnetic excitations in NpCoGa5:: Inelastic neutron scattering experiments

被引:12
|
作者
Magnani, N.
Hiess, A.
Caciuffo, R.
Colineau, E.
Wastin, F.
Rebizant, J.
Lander, G. H.
机构
[1] Commiss European Communities, Joint Res Ctr, Inst Transuranium Elements, D-76125 Karlsruhe, Germany
[2] Inst Max Von Laue Paul Langevin, F-38042 Grenoble, France
来源
PHYSICAL REVIEW B | 2007年 / 76卷 / 10期
关键词
D O I
10.1103/PhysRevB.76.100404
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
We report the results of inelastic neutron scattering experiments on NpCoGa5, an isostructural analog of the PuCoGa5 superconductor. Two energy scales characterize the magnetic response in the antiferromagnetic phase. One is related to a nondispersive excitation between two crystal field levels. The other at lower energies corresponds to dispersive fluctuations emanating from the magnetic zone center. The fluctuations persist in the paramagnetic phase also, although weaker in intensity. This supports the possibility that magnetic fluctuations are present in PuCoGa5, where unconventional d-wave superconductivity is achieved in the absence of magnetic order.
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页数:4
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