Spin-wave dynamics in the helimagnet FeGe studied by small-angle neutron scattering

被引：19

作者：

Siegfried, S. -A. ^{[1
]}

Sukhanov, A. S. ^{[2
,3
,6
]}

Altynbaev, E. V. ^{[2
,3
]}

Honecker, D. ^{[4
]}

Heinemann, A. ^{[1
]}

Tsvyashchenko, A. V. ^{[5
]}

Grigoriev, S. V. ^{[2
,3
]}

机构：

[1] Helmholtz Zentrum Geesthacht GmbH, German Engn Mat Sci Ctr GEMS, Heinz Maier Leibnitz Zentrum MLZ, Lichtenbergstr 1, D-85747 Garching, Germany

[2] Petersburg Nucl Phys Inst, St Petersburg 188300, Russia

[3] St Petersburg State Univ, Fac Phys, Ulyanovskaya 1, St Petersburg 198504, Russia

[4] Inst Laue Langevin, F-38042 Grenoble 9, France

[5] Russian Acad Sci, Inst High Pressure Phys, Moscow 142190, Russia

[6] Max Planck Inst Chem Phys Solids, D-01187 Dresden, Germany

来源：

PHYSICAL REVIEW B | 2017年 / 95卷 / 13期

关键词：

ITINERANT FERROMAGNET MNSI; WEAK FERROMAGNETISM; MAGNETIC-STRUCTURES; EXCITATIONS;

D O I：

10.1103/PhysRevB.95.134415

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We have studied the spin-wave stiffness of the Dzyaloshinskii-Moriya helimagnet FeGe in a temperature range from 225 K up to T-C approximate to 278.7 K by small-angle neutron scattering. The method we have used is based on [Grigoriev et al., Phys. Rev. B 92, 220415(R) (2015)] and was extended here for the application in polycrystalline samples. We confirm the validity of the anisotropic spin-wave dispersion for FeGe caused by the Dzyaloshinskii-Moriya interaction. We have shown that the spin-wave stiffness A for the FeGe helimagnet decreases with a temperature as A(T) = 194[1 - 0.7(T/TC) 4.2] meV angstrom(2). The finite value of the spin-wave stiffness A = 58 meV angstrom(2) at TC classifies the order-disorder phase transition in FeGe as being the first-order one.

引用

页数：6

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