Possible skyrmion-lattice ground state in the B20 chiral-lattice magnet MnGe as seen via small-angle neutron scattering

被引：118

作者：

Kanazawa, N. ^{[1
,2
]}

Kim, J. -H. ^{[3
]}

Inosov, D. S. ^{[3
]}

White, J. S. ^{[4
,5
]}

Egetenmeyer, N. ^{[4
]}

Gavilano, J. L. ^{[4
]}

Ishiwata, S. ^{[1
,2
]}

Onose, Y. ^{[6
]}

Arima, T. ^{[7
,8
]}

Keimer, B. ^{[3
]}

Tokura, Y. ^{[1
,2
,9
,10
]}

机构：

[1] Univ Tokyo, Dept Appl Phys, Tokyo 1138656, Japan

[2] Univ Tokyo, QPEC, Tokyo 1138656, Japan

[3] Max Planck Inst Solid State Res, D-70569 Stuttgart, Germany

[4] Paul Scherrer Inst, Neutron Scattering Lab, CH-5232 Villigen, Switzerland

[5] Ecole Polytech Fed Lausanne, Lab Quantum Magnetism, CH-1015 Lausanne, Switzerland

[6] Univ Tokyo, Dept Basic Sci, Tokyo 1538902, Japan

[7] Univ Tokyo, Dept Adv Mat Sci, Kashiwa, Chiba 2778561, Japan

[8] RIKEN SPring 8 Ctr, Sayo, Hyogo 6795148, Japan

[9] RIKEN Adv Sci Inst, Cross Correlated Mat Res Grp CMRG, Wako, Saitama 3510198, Japan

[10] RIKEN Adv Sci Inst, CERG, Wako, Saitama 3510198, Japan

来源：

PHYSICAL REVIEW B | 2012年 / 86卷 / 13期

基金：

瑞士国家科学基金会; 日本学术振兴会;

关键词：

PHASE-DIAGRAM; MNSI; TEMPERATURE;

D O I：

10.1103/PhysRevB.86.134425

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We have investigated the magnetic structure in a polycrystalline sample of the B20-type MnGe by means of small-angle neutron scattering. On the projected diffraction plane normal to the incoming neutron beam, a Debye-ring-like pattern appears due to the random orientation of the spin helix q vectors (vertical bar vertical bar < 100 >). When an external magnetic field is applied normal to the incoming neutron beam, an intense peak with wave vector (q) perpendicular to the applied magnetic field is observed as the hallmark of the formation of a skyrmion lattice with a multiple-q helix in a wide temperature-magnetic-field region. This scattering intensity remains even after removing the magnetic field, which indicates that a skyrmion lattice is stabilized as the ground state. A different form of skyrmion lattice, either square or cubic, is proposed, which is also shown to be in good agreement with previous high-angle neutron diffraction results. Calculations based on such structures also describe the magnetic-field profile of the topological Hall resistivity.

引用

页数：7

共 42 条

[1] Long-Range Crystalline Nature of the Skyrmion Lattice in MnSi [J].