Damped spin-wave excitations in the itinerant antiferromagnet. γ-Fe0.7Mn0.3

被引：8
|
作者：
Ibuka, S. [1 ,2 ,5 ]
Itoh, S. [1 ,2 ,3 ]
Yokoo, T. [1 ,2 ,3 ]
Endoh, Y. [1 ,4 ]
机构：
[1] High Energy Accelerator Res Org, Inst Mat Struct Sci, Tsukuba, Ibaraki 3050801, Japan
[2] J PARC Ctr, Mat & Life Sci Facil, Tokai, Ibaraki 3191195, Japan
[3] Grad Univ Adv Studies, Sch High Energy Sci, Dept Mat Struct Sci, Tsukuba, Ibaraki 3050801, Japan
[4] RIKEN Ctr Emergent Matter Sci, Wako, Saitama 3510198, Japan
[5] Tohoku Univ, Dept Phys, Sendai, Miyagi 9808578, Japan
来源：
PHYSICAL REVIEW B | 2017年 / 95卷 / 22期
关键词：
GAMMA-FEMN ALLOYS; ENERGY MAGNETIC EXCITATIONS; MN ALLOYS; NEUTRON-SCATTERING; DENSITY-WAVE; TRANSITION-METALS; TRIPLE-Q; IRON; DYNAMICS; CHROMIUM;
D O I：
10.1103/PhysRevB.95.224406
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The collective spin-wave excitations in the antiferromagnetic state of gamma-Fe0.7Mn0.3 were investigated using the inelastic neutron-scattering technique. The spin excitations remain isotropic up to high excitation energy, h omega = 78 meV. The excitations gradually become broad and damped above 40 meV. The damping parameter gamma reaches 110(16) meV at h omega = 78 meV, which is much larger than that for other metallic compounds, e.g., CaFe2As2 (24 meV), La2-2x Sr1+2x Mn2O7 (52-72 meV), and Mn90Cu10 (88 meV). In addition, the spin-wave dispersion shows a deviation from the relation (h omega)(2) = c(2)q(2) + Delta(2) above 40 meV. The group velocity above this energy increases to 470(40) meV angstrom, which is higher than that at the low energies, c = 226(5) meV angstrom. These results could suggest that the spin-wave excitations mergewith the continuum of the individual particle-hole excitations at 40 meV.
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页数：7
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